/*
 * Copyright 2011 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */
#include "disp.h"
#include "atom.h"
#include "core.h"
#include "head.h"
#include "wndw.h"
#include "handles.h"

#include <linux/backlight.h>
#include <linux/dma-mapping.h>
#include <linux/hdmi.h>
#include <linux/component.h>
#include <linux/iopoll.h>

#include <drm/display/drm_dp_helper.h>
#include <drm/display/drm_scdc_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_eld.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fixed.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include <nvif/push507c.h>

#include <nvif/class.h>
#include <nvif/cl0002.h>
#include <nvif/event.h>
#include <nvif/if0012.h>
#include <nvif/if0014.h>
#include <nvif/timer.h>

#include <nvhw/class/cl507c.h>
#include <nvhw/class/cl507d.h>
#include <nvhw/class/cl837d.h>
#include <nvhw/class/cl887d.h>
#include <nvhw/class/cl907d.h>
#include <nvhw/class/cl917d.h>

#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nouveau_gem.h"
#include "nouveau_connector.h"
#include "nouveau_encoder.h"
#include "nouveau_fence.h"
#include "nv50_display.h"

/******************************************************************************
 * EVO channel
 *****************************************************************************/

static int
nv50_chan_create(struct nvif_device *device, struct nvif_object *disp,
		 const s32 *oclass, u8 head, void *data, u32 size,
		 struct nv50_chan *chan)
{
	struct nvif_sclass *sclass;
	int ret, i, n;

	chan->device = device;

	ret = n = nvif_object_sclass_get(disp, &sclass);
	if (ret < 0)
		return ret;

	while (oclass[0]) {
		for (i = 0; i < n; i++) {
			if (sclass[i].oclass == oclass[0]) {
				ret = nvif_object_ctor(disp, "kmsChan", 0,
						       oclass[0], data, size,
						       &chan->user);
				if (ret == 0)
					nvif_object_map(&chan->user, NULL, 0);
				nvif_object_sclass_put(&sclass);
				return ret;
			}
		}
		oclass++;
	}

	nvif_object_sclass_put(&sclass);
	return -ENOSYS;
}

static void
nv50_chan_destroy(struct nv50_chan *chan)
{
	nvif_object_dtor(&chan->user);
}

/******************************************************************************
 * DMA EVO channel
 *****************************************************************************/

void
nv50_dmac_destroy(struct nv50_dmac *dmac)
{
	nvif_object_dtor(&dmac->vram);
	nvif_object_dtor(&dmac->sync);

	nv50_chan_destroy(&dmac->base);

	nvif_mem_dtor(&dmac->_push.mem);
}

static void
nv50_dmac_kick(struct nvif_push *push)
{
	struct nv50_dmac *dmac = container_of(push, typeof(*dmac), _push);

	dmac->cur = push->cur - (u32 __iomem *)dmac->_push.mem.object.map.ptr;
	if (dmac->put != dmac->cur) {
		/* Push buffer fetches are not coherent with BAR1, we need to ensure
		 * writes have been flushed right through to VRAM before writing PUT.
		 */
		if (dmac->push->mem.type & NVIF_MEM_VRAM) {
			struct nvif_device *device = dmac->base.device;
			nvif_wr32(&device->object, 0x070000, 0x00000001);
			nvif_msec(device, 2000,
				if (!(nvif_rd32(&device->object, 0x070000) & 0x00000002))
					break;
			);
		}

		NVIF_WV32(&dmac->base.user, NV507C, PUT, PTR, dmac->cur);
		dmac->put = dmac->cur;
	}

	push->bgn = push->cur;
}

static int
nv50_dmac_free(struct nv50_dmac *dmac)
{
	u32 get = NVIF_RV32(&dmac->base.user, NV507C, GET, PTR);
	if (get > dmac->cur) /* NVIDIA stay 5 away from GET, do the same. */
		return get - dmac->cur - 5;
	return dmac->max - dmac->cur;
}

static int
nv50_dmac_wind(struct nv50_dmac *dmac)
{
	/* Wait for GET to depart from the beginning of the push buffer to
	 * prevent writing PUT == GET, which would be ignored by HW.
	 */
	u32 get = NVIF_RV32(&dmac->base.user, NV507C, GET, PTR);
	if (get == 0) {
		/* Corner-case, HW idle, but non-committed work pending. */
		if (dmac->put == 0)
			nv50_dmac_kick(dmac->push);

		if (nvif_msec(dmac->base.device, 2000,
			if (NVIF_TV32(&dmac->base.user, NV507C, GET, PTR, >, 0))
				break;
		) < 0)
			return -ETIMEDOUT;
	}

	PUSH_RSVD(dmac->push, PUSH_JUMP(dmac->push, 0));
	dmac->cur = 0;
	return 0;
}

static int
nv50_dmac_wait(struct nvif_push *push, u32 size)
{
	struct nv50_dmac *dmac = container_of(push, typeof(*dmac), _push);
	int free;

	if (WARN_ON(size > dmac->max))
		return -EINVAL;

	dmac->cur = push->cur - (u32 __iomem *)dmac->_push.mem.object.map.ptr;
	if (dmac->cur + size >= dmac->max) {
		int ret = nv50_dmac_wind(dmac);
		if (ret)
			return ret;

		push->cur = dmac->_push.mem.object.map.ptr;
		push->cur = push->cur + dmac->cur;
		nv50_dmac_kick(push);
	}

	if (nvif_msec(dmac->base.device, 2000,
		if ((free = nv50_dmac_free(dmac)) >= size)
			break;
	) < 0) {
		WARN_ON(1);
		return -ETIMEDOUT;
	}

	push->bgn = dmac->_push.mem.object.map.ptr;
	push->bgn = push->bgn + dmac->cur;
	push->cur = push->bgn;
	push->end = push->cur + free;
	return 0;
}

MODULE_PARM_DESC(kms_vram_pushbuf, "Place EVO/NVD push buffers in VRAM (default: auto)");
static int nv50_dmac_vram_pushbuf = -1;
module_param_named(kms_vram_pushbuf, nv50_dmac_vram_pushbuf, int, 0400);

int
nv50_dmac_create(struct nvif_device *device, struct nvif_object *disp,
		 const s32 *oclass, u8 head, void *data, u32 size, s64 syncbuf,
		 struct nv50_dmac *dmac)
{
	struct nouveau_cli *cli = (void *)device->object.client;
	struct nvif_disp_chan_v0 *args = data;
	u8 type = NVIF_MEM_COHERENT;
	int ret;

	mutex_init(&dmac->lock);

	/* Pascal added support for 47-bit physical addresses, but some
	 * parts of EVO still only accept 40-bit PAs.
	 *
	 * To avoid issues on systems with large amounts of RAM, and on
	 * systems where an IOMMU maps pages at a high address, we need
	 * to allocate push buffers in VRAM instead.
	 *
	 * This appears to match NVIDIA's behaviour on Pascal.
	 */
	if ((nv50_dmac_vram_pushbuf > 0) ||
	    (nv50_dmac_vram_pushbuf < 0 && device->info.family == NV_DEVICE_INFO_V0_PASCAL))
		type |= NVIF_MEM_VRAM;

	ret = nvif_mem_ctor_map(&cli->mmu, "kmsChanPush", type, 0x1000,
				&dmac->_push.mem);
	if (ret)
		return ret;

	dmac->ptr = dmac->_push.mem.object.map.ptr;
	dmac->_push.wait = nv50_dmac_wait;
	dmac->_push.kick = nv50_dmac_kick;
	dmac->push = &dmac->_push;
	dmac->push->bgn = dmac->_push.mem.object.map.ptr;
	dmac->push->cur = dmac->push->bgn;
	dmac->push->end = dmac->push->bgn;
	dmac->max = 0x1000/4 - 1;

	/* EVO channels are affected by a HW bug where the last 12 DWORDs
	 * of the push buffer aren't able to be used safely.
	 */
	if (disp->oclass < GV100_DISP)
		dmac->max -= 12;

	args->pushbuf = nvif_handle(&dmac->_push.mem.object);

	ret = nv50_chan_create(device, disp, oclass, head, data, size,
			       &dmac->base);
	if (ret)
		return ret;

	if (syncbuf < 0)
		return 0;

	ret = nvif_object_ctor(&dmac->base.user, "kmsSyncCtxDma", NV50_DISP_HANDLE_SYNCBUF,
			       NV_DMA_IN_MEMORY,
			       &(struct nv_dma_v0) {
					.target = NV_DMA_V0_TARGET_VRAM,
					.access = NV_DMA_V0_ACCESS_RDWR,
					.start = syncbuf + 0x0000,
					.limit = syncbuf + 0x0fff,
			       }, sizeof(struct nv_dma_v0),
			       &dmac->sync);
	if (ret)
		return ret;

	ret = nvif_object_ctor(&dmac->base.user, "kmsVramCtxDma", NV50_DISP_HANDLE_VRAM,
			       NV_DMA_IN_MEMORY,
			       &(struct nv_dma_v0) {
					.target = NV_DMA_V0_TARGET_VRAM,
					.access = NV_DMA_V0_ACCESS_RDWR,
					.start = 0,
					.limit = device->info.ram_user - 1,
			       }, sizeof(struct nv_dma_v0),
			       &dmac->vram);
	if (ret)
		return ret;

	return ret;
}

/******************************************************************************
 * Output path helpers
 *****************************************************************************/
static void
nv50_outp_dump_caps(struct nouveau_drm *drm,
		    struct nouveau_encoder *outp)
{
	NV_DEBUG(drm, "%s caps: dp_interlace=%d\n",
		 outp->base.base.name, outp->caps.dp_interlace);
}

static int
nv50_outp_atomic_check_view(struct drm_encoder *encoder,
			    struct drm_crtc_state *crtc_state,
			    struct drm_connector_state *conn_state,
			    struct drm_display_mode *native_mode)
{
	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
	struct drm_display_mode *mode = &crtc_state->mode;
	struct drm_connector *connector = conn_state->connector;
	struct nouveau_conn_atom *asyc = nouveau_conn_atom(conn_state);
	struct nouveau_drm *drm = nouveau_drm(encoder->dev);

	NV_ATOMIC(drm, "%s atomic_check\n", encoder->name);
	asyc->scaler.full = false;
	if (!native_mode)
		return 0;

	if (asyc->scaler.mode == DRM_MODE_SCALE_NONE) {
		switch (connector->connector_type) {
		case DRM_MODE_CONNECTOR_LVDS:
		case DRM_MODE_CONNECTOR_eDP:
			/* Don't force scaler for EDID modes with
			 * same size as the native one (e.g. different
			 * refresh rate)
			 */
			if (mode->hdisplay == native_mode->hdisplay &&
			    mode->vdisplay == native_mode->vdisplay &&
			    mode->type & DRM_MODE_TYPE_DRIVER)
				break;
			mode = native_mode;
			asyc->scaler.full = true;
			break;
		default:
			break;
		}
	} else {
		mode = native_mode;
	}

	if (!drm_mode_equal(adjusted_mode, mode)) {
		drm_mode_copy(adjusted_mode, mode);
		crtc_state->mode_changed = true;
	}

	return 0;
}

static void
nv50_outp_atomic_fix_depth(struct drm_encoder *encoder, struct drm_crtc_state *crtc_state)
{
	struct nv50_head_atom *asyh = nv50_head_atom(crtc_state);
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct drm_display_mode *mode = &asyh->state.adjusted_mode;
	unsigned int max_rate, mode_rate;

	switch (nv_encoder->dcb->type) {
	case DCB_OUTPUT_DP:
		max_rate = nv_encoder->dp.link_nr * nv_encoder->dp.link_bw;

		/* we don't support more than 10 anyway */
		asyh->or.bpc = min_t(u8, asyh->or.bpc, 10);

		/* reduce the bpc until it works out */
		while (asyh->or.bpc > 6) {
			mode_rate = DIV_ROUND_UP(mode->clock * asyh->or.bpc * 3, 8);
			if (mode_rate <= max_rate)
				break;

			asyh->or.bpc -= 2;
		}
		break;
	default:
		break;
	}
}

static int
nv50_outp_atomic_check(struct drm_encoder *encoder,
		       struct drm_crtc_state *crtc_state,
		       struct drm_connector_state *conn_state)
{
	struct drm_connector *connector = conn_state->connector;
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct nv50_head_atom *asyh = nv50_head_atom(crtc_state);
	int ret;

	ret = nv50_outp_atomic_check_view(encoder, crtc_state, conn_state,
					  nv_connector->native_mode);
	if (ret)
		return ret;

	if (crtc_state->mode_changed || crtc_state->connectors_changed)
		asyh->or.bpc = connector->display_info.bpc;

	/* We might have to reduce the bpc */
	nv50_outp_atomic_fix_depth(encoder, crtc_state);

	return 0;
}

struct nouveau_connector *
nv50_outp_get_new_connector(struct drm_atomic_state *state, struct nouveau_encoder *outp)
{
	struct drm_connector *connector;
	struct drm_connector_state *connector_state;
	struct drm_encoder *encoder = to_drm_encoder(outp);
	int i;

	for_each_new_connector_in_state(state, connector, connector_state, i) {
		if (connector_state->best_encoder == encoder)
			return nouveau_connector(connector);
	}

	return NULL;
}

struct nouveau_connector *
nv50_outp_get_old_connector(struct drm_atomic_state *state, struct nouveau_encoder *outp)
{
	struct drm_connector *connector;
	struct drm_connector_state *connector_state;
	struct drm_encoder *encoder = to_drm_encoder(outp);
	int i;

	for_each_old_connector_in_state(state, connector, connector_state, i) {
		if (connector_state->best_encoder == encoder)
			return nouveau_connector(connector);
	}

	return NULL;
}

static struct nouveau_crtc *
nv50_outp_get_new_crtc(const struct drm_atomic_state *state, const struct nouveau_encoder *outp)
{
	struct drm_crtc *crtc;
	struct drm_crtc_state *crtc_state;
	const u32 mask = drm_encoder_mask(&outp->base.base);
	int i;

	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
		if (crtc_state->encoder_mask & mask)
			return nouveau_crtc(crtc);
	}

	return NULL;
}

/******************************************************************************
 * DAC
 *****************************************************************************/
static void
nv50_dac_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nv50_core *core = nv50_disp(encoder->dev)->core;
	const u32 ctrl = NVDEF(NV507D, DAC_SET_CONTROL, OWNER, NONE);

	core->func->dac->ctrl(core, nv_encoder->outp.or.id, ctrl, NULL);
	nv_encoder->crtc = NULL;
}

static void
nv50_dac_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nouveau_crtc *nv_crtc = nv50_outp_get_new_crtc(state, nv_encoder);
	struct nv50_head_atom *asyh =
		nv50_head_atom(drm_atomic_get_new_crtc_state(state, &nv_crtc->base));
	struct nv50_core *core = nv50_disp(encoder->dev)->core;
	u32 ctrl = 0;

	switch (nv_crtc->index) {
	case 0: ctrl |= NVDEF(NV507D, DAC_SET_CONTROL, OWNER, HEAD0); break;
	case 1: ctrl |= NVDEF(NV507D, DAC_SET_CONTROL, OWNER, HEAD1); break;
	case 2: ctrl |= NVDEF(NV907D, DAC_SET_CONTROL, OWNER_MASK, HEAD2); break;
	case 3: ctrl |= NVDEF(NV907D, DAC_SET_CONTROL, OWNER_MASK, HEAD3); break;
	default:
		WARN_ON(1);
		break;
	}

	ctrl |= NVDEF(NV507D, DAC_SET_CONTROL, PROTOCOL, RGB_CRT);

	if (!nvif_outp_acquired(&nv_encoder->outp))
		nvif_outp_acquire_dac(&nv_encoder->outp);

	core->func->dac->ctrl(core, nv_encoder->outp.or.id, ctrl, asyh);
	asyh->or.depth = 0;

	nv_encoder->crtc = &nv_crtc->base;
}

static enum drm_connector_status
nv50_dac_detect(struct drm_encoder *encoder, struct drm_connector *connector)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	u32 loadval;
	int ret;

	loadval = nouveau_drm(encoder->dev)->vbios.dactestval;
	if (loadval == 0)
		loadval = 340;

	ret = nvif_outp_load_detect(&nv_encoder->outp, loadval);
	if (ret <= 0)
		return connector_status_disconnected;

	return connector_status_connected;
}

static const struct drm_encoder_helper_funcs
nv50_dac_help = {
	.atomic_check = nv50_outp_atomic_check,
	.atomic_enable = nv50_dac_atomic_enable,
	.atomic_disable = nv50_dac_atomic_disable,
	.detect = nv50_dac_detect
};

static void
nv50_dac_destroy(struct drm_encoder *encoder)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);

	nvif_outp_dtor(&nv_encoder->outp);

	drm_encoder_cleanup(encoder);
	kfree(encoder);
}

static const struct drm_encoder_funcs
nv50_dac_func = {
	.destroy = nv50_dac_destroy,
};

static int
nv50_dac_create(struct nouveau_encoder *nv_encoder)
{
	struct drm_connector *connector = &nv_encoder->conn->base;
	struct nouveau_drm *drm = nouveau_drm(connector->dev);
	struct nvkm_i2c *i2c = nvxx_i2c(&drm->client.device);
	struct nvkm_i2c_bus *bus;
	struct drm_encoder *encoder;
	struct dcb_output *dcbe = nv_encoder->dcb;
	int type = DRM_MODE_ENCODER_DAC;

	bus = nvkm_i2c_bus_find(i2c, dcbe->i2c_index);
	if (bus)
		nv_encoder->i2c = &bus->i2c;

	encoder = to_drm_encoder(nv_encoder);
	drm_encoder_init(connector->dev, encoder, &nv50_dac_func, type,
			 "dac-%04x-%04x", dcbe->hasht, dcbe->hashm);
	drm_encoder_helper_add(encoder, &nv50_dac_help);

	drm_connector_attach_encoder(connector, encoder);
	return 0;
}

/*
 * audio component binding for ELD notification
 */
static void
nv50_audio_component_eld_notify(struct drm_audio_component *acomp, int port,
				int dev_id)
{
	if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
		acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
						 port, dev_id);
}

static int
nv50_audio_component_get_eld(struct device *kdev, int port, int dev_id,
			     bool *enabled, unsigned char *buf, int max_bytes)
{
	struct drm_device *drm_dev = dev_get_drvdata(kdev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct drm_encoder *encoder;
	struct nouveau_encoder *nv_encoder;
	struct nouveau_crtc *nv_crtc;
	int ret = 0;

	*enabled = false;

	mutex_lock(&drm->audio.lock);

	drm_for_each_encoder(encoder, drm->dev) {
		struct nouveau_connector *nv_connector = NULL;

		if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST)
			continue; /* TODO */

		nv_encoder = nouveau_encoder(encoder);
		nv_connector = nv_encoder->conn;
		nv_crtc = nouveau_crtc(nv_encoder->crtc);

		if (!nv_crtc || nv_encoder->outp.or.id != port || nv_crtc->index != dev_id)
			continue;

		*enabled = nv_encoder->audio.enabled;
		if (*enabled) {
			ret = drm_eld_size(nv_connector->base.eld);
			memcpy(buf, nv_connector->base.eld,
			       min(max_bytes, ret));
		}
		break;
	}

	mutex_unlock(&drm->audio.lock);

	return ret;
}

static const struct drm_audio_component_ops nv50_audio_component_ops = {
	.get_eld = nv50_audio_component_get_eld,
};

static int
nv50_audio_component_bind(struct device *kdev, struct device *hda_kdev,
			  void *data)
{
	struct drm_device *drm_dev = dev_get_drvdata(kdev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct drm_audio_component *acomp = data;

	if (WARN_ON(!device_link_add(hda_kdev, kdev, DL_FLAG_STATELESS)))
		return -ENOMEM;

	drm_modeset_lock_all(drm_dev);
	acomp->ops = &nv50_audio_component_ops;
	acomp->dev = kdev;
	drm->audio.component = acomp;
	drm_modeset_unlock_all(drm_dev);
	return 0;
}

static void
nv50_audio_component_unbind(struct device *kdev, struct device *hda_kdev,
			    void *data)
{
	struct drm_device *drm_dev = dev_get_drvdata(kdev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct drm_audio_component *acomp = data;

	drm_modeset_lock_all(drm_dev);
	drm->audio.component = NULL;
	acomp->ops = NULL;
	acomp->dev = NULL;
	drm_modeset_unlock_all(drm_dev);
}

static const struct component_ops nv50_audio_component_bind_ops = {
	.bind   = nv50_audio_component_bind,
	.unbind = nv50_audio_component_unbind,
};

static void
nv50_audio_component_init(struct nouveau_drm *drm)
{
	if (component_add(drm->dev->dev, &nv50_audio_component_bind_ops))
		return;

	drm->audio.component_registered = true;
	mutex_init(&drm->audio.lock);
}

static void
nv50_audio_component_fini(struct nouveau_drm *drm)
{
	if (!drm->audio.component_registered)
		return;

	component_del(drm->dev->dev, &nv50_audio_component_bind_ops);
	drm->audio.component_registered = false;
	mutex_destroy(&drm->audio.lock);
}

/******************************************************************************
 * Audio
 *****************************************************************************/
static bool
nv50_audio_supported(struct drm_encoder *encoder)
{
	struct nv50_disp *disp = nv50_disp(encoder->dev);

	if (disp->disp->object.oclass <= GT200_DISP ||
	    disp->disp->object.oclass == GT206_DISP)
		return false;

	if (encoder->encoder_type != DRM_MODE_ENCODER_DPMST) {
		struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);

		switch (nv_encoder->dcb->type) {
		case DCB_OUTPUT_TMDS:
		case DCB_OUTPUT_DP:
			break;
		default:
			return false;
		}
	}

	return true;
}

static void
nv50_audio_disable(struct drm_encoder *encoder, struct nouveau_crtc *nv_crtc)
{
	struct nouveau_drm *drm = nouveau_drm(encoder->dev);
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nvif_outp *outp = &nv_encoder->outp;

	if (!nv50_audio_supported(encoder))
		return;

	mutex_lock(&drm->audio.lock);
	if (nv_encoder->audio.enabled) {
		nv_encoder->audio.enabled = false;
		nvif_outp_hda_eld(&nv_encoder->outp, nv_crtc->index, NULL, 0);
	}
	mutex_unlock(&drm->audio.lock);

	nv50_audio_component_eld_notify(drm->audio.component, outp->or.id, nv_crtc->index);
}

static void
nv50_audio_enable(struct drm_encoder *encoder, struct nouveau_crtc *nv_crtc,
		  struct nouveau_connector *nv_connector, struct drm_atomic_state *state,
		  struct drm_display_mode *mode)
{
	struct nouveau_drm *drm = nouveau_drm(encoder->dev);
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nvif_outp *outp = &nv_encoder->outp;

	if (!nv50_audio_supported(encoder) || !drm_detect_monitor_audio(nv_connector->edid))
		return;

	mutex_lock(&drm->audio.lock);

	nvif_outp_hda_eld(&nv_encoder->outp, nv_crtc->index, nv_connector->base.eld,
			  drm_eld_size(nv_connector->base.eld));
	nv_encoder->audio.enabled = true;

	mutex_unlock(&drm->audio.lock);

	nv50_audio_component_eld_notify(drm->audio.component, outp->or.id, nv_crtc->index);
}

/******************************************************************************
 * HDMI
 *****************************************************************************/
static void
nv50_hdmi_enable(struct drm_encoder *encoder, struct nouveau_crtc *nv_crtc,
		 struct nouveau_connector *nv_connector, struct drm_atomic_state *state,
		 struct drm_display_mode *mode, bool hda)
{
	struct nouveau_drm *drm = nouveau_drm(encoder->dev);
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct drm_hdmi_info *hdmi = &nv_connector->base.display_info.hdmi;
	union hdmi_infoframe infoframe = { 0 };
	const u8 rekey = 56; /* binary driver, and tegra, constant */
	u32 max_ac_packet;
	struct {
		struct nvif_outp_infoframe_v0 infoframe;
		u8 data[17];
	} args = { 0 };
	int ret, size;

	max_ac_packet  = mode->htotal - mode->hdisplay;
	max_ac_packet -= rekey;
	max_ac_packet -= 18; /* constant from tegra */
	max_ac_packet /= 32;

	if (nv_encoder->i2c && hdmi->scdc.scrambling.supported) {
		const bool high_tmds_clock_ratio = mode->clock > 340000;
		u8 scdc;

		ret = drm_scdc_readb(nv_encoder->i2c, SCDC_TMDS_CONFIG, &scdc);
		if (ret < 0) {
			NV_ERROR(drm, "Failure to read SCDC_TMDS_CONFIG: %d\n", ret);
			return;
		}

		scdc &= ~(SCDC_TMDS_BIT_CLOCK_RATIO_BY_40 | SCDC_SCRAMBLING_ENABLE);
		if (high_tmds_clock_ratio || hdmi->scdc.scrambling.low_rates)
			scdc |= SCDC_SCRAMBLING_ENABLE;
		if (high_tmds_clock_ratio)
			scdc |= SCDC_TMDS_BIT_CLOCK_RATIO_BY_40;

		ret = drm_scdc_writeb(nv_encoder->i2c, SCDC_TMDS_CONFIG, scdc);
		if (ret < 0)
			NV_ERROR(drm, "Failure to write SCDC_TMDS_CONFIG = 0x%02x: %d\n",
				 scdc, ret);
	}

	ret = nvif_outp_hdmi(&nv_encoder->outp, nv_crtc->index, true, max_ac_packet, rekey,
			     mode->clock, hdmi->scdc.supported, hdmi->scdc.scrambling.supported,
			     hdmi->scdc.scrambling.low_rates);
	if (ret)
		return;

	/* AVI InfoFrame. */
	args.infoframe.version = 0;
	args.infoframe.head = nv_crtc->index;

	if (!drm_hdmi_avi_infoframe_from_display_mode(&infoframe.avi, &nv_connector->base, mode)) {
		drm_hdmi_avi_infoframe_quant_range(&infoframe.avi, &nv_connector->base, mode,
						   HDMI_QUANTIZATION_RANGE_FULL);

		size = hdmi_infoframe_pack(&infoframe, args.data, ARRAY_SIZE(args.data));
	} else {
		size = 0;
	}

	nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_AVI, &args.infoframe, size);

	/* Vendor InfoFrame. */
	memset(&args.data, 0, sizeof(args.data));
	if (!drm_hdmi_vendor_infoframe_from_display_mode(&infoframe.vendor.hdmi,
							 &nv_connector->base, mode))
		size = hdmi_infoframe_pack(&infoframe, args.data, ARRAY_SIZE(args.data));
	else
		size = 0;

	nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_VSI, &args.infoframe, size);

	nv_encoder->hdmi.enabled = true;
}

/******************************************************************************
 * MST
 *****************************************************************************/
#define nv50_mstm(p) container_of((p), struct nv50_mstm, mgr)
#define nv50_mstc(p) container_of((p), struct nv50_mstc, connector)
#define nv50_msto(p) container_of((p), struct nv50_msto, encoder)

struct nv50_mstc {
	struct nv50_mstm *mstm;
	struct drm_dp_mst_port *port;
	struct drm_connector connector;

	struct drm_display_mode *native;
	struct edid *edid;
};

struct nv50_msto {
	struct drm_encoder encoder;

	/* head is statically assigned on msto creation */
	struct nv50_head *head;
	struct nv50_mstc *mstc;
	bool disabled;
	bool enabled;

	u32 display_id;
};

struct nouveau_encoder *nv50_real_outp(struct drm_encoder *encoder)
{
	struct nv50_msto *msto;

	if (encoder->encoder_type != DRM_MODE_ENCODER_DPMST)
		return nouveau_encoder(encoder);

	msto = nv50_msto(encoder);
	if (!msto->mstc)
		return NULL;
	return msto->mstc->mstm->outp;
}

static void
nv50_msto_cleanup(struct drm_atomic_state *state,
		  struct drm_dp_mst_topology_state *new_mst_state,
		  struct drm_dp_mst_topology_mgr *mgr,
		  struct nv50_msto *msto)
{
	struct nouveau_drm *drm = nouveau_drm(msto->encoder.dev);
	struct drm_dp_mst_atomic_payload *new_payload =
		drm_atomic_get_mst_payload_state(new_mst_state, msto->mstc->port);
	struct drm_dp_mst_topology_state *old_mst_state =
		drm_atomic_get_old_mst_topology_state(state, mgr);
	const struct drm_dp_mst_atomic_payload *old_payload =
		drm_atomic_get_mst_payload_state(old_mst_state, msto->mstc->port);
	struct nv50_mstc *mstc = msto->mstc;
	struct nv50_mstm *mstm = mstc->mstm;

	NV_ATOMIC(drm, "%s: msto cleanup\n", msto->encoder.name);

	if (msto->disabled) {
		if (msto->head->func->display_id) {
			nvif_outp_dp_mst_id_put(&mstm->outp->outp, msto->display_id);
			msto->display_id = 0;
		}

		msto->mstc = NULL;
		msto->disabled = false;
		drm_dp_remove_payload_part2(mgr, new_mst_state, old_payload, new_payload);
	} else if (msto->enabled) {
		drm_dp_add_payload_part2(mgr, state, new_payload);
		msto->enabled = false;
	}
}

static void
nv50_msto_prepare(struct drm_atomic_state *state,
		  struct drm_dp_mst_topology_state *mst_state,
		  struct drm_dp_mst_topology_mgr *mgr,
		  struct nv50_msto *msto)
{
	struct nouveau_drm *drm = nouveau_drm(msto->encoder.dev);
	struct nv50_mstc *mstc = msto->mstc;
	struct nv50_mstm *mstm = mstc->mstm;
	struct drm_dp_mst_atomic_payload *payload;
	int ret = 0;

	NV_ATOMIC(drm, "%s: msto prepare\n", msto->encoder.name);

	payload = drm_atomic_get_mst_payload_state(mst_state, mstc->port);

	if (msto->disabled) {
		drm_dp_remove_payload_part1(mgr, mst_state, payload);
		nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index, 0, 0, 0, 0);
		ret = 1;
	} else {
		if (msto->enabled)
			ret = drm_dp_add_payload_part1(mgr, mst_state, payload);
	}

	if (ret == 0) {
		nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index,
				      payload->vc_start_slot, payload->time_slots,
				      payload->pbn,
				      payload->time_slots * dfixed_trunc(mst_state->pbn_div));
	} else {
		nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index, 0, 0, 0, 0);
	}
}

static int
nv50_msto_atomic_check(struct drm_encoder *encoder,
		       struct drm_crtc_state *crtc_state,
		       struct drm_connector_state *conn_state)
{
	struct drm_atomic_state *state = crtc_state->state;
	struct drm_connector *connector = conn_state->connector;
	struct drm_dp_mst_topology_state *mst_state;
	struct nv50_mstc *mstc = nv50_mstc(connector);
	struct nv50_mstm *mstm = mstc->mstm;
	struct nv50_head_atom *asyh = nv50_head_atom(crtc_state);
	int slots;
	int ret;

	ret = nv50_outp_atomic_check_view(encoder, crtc_state, conn_state,
					  mstc->native);
	if (ret)
		return ret;

	if (!drm_atomic_crtc_needs_modeset(crtc_state))
		return 0;

	/*
	 * When restoring duplicated states, we need to make sure that the bw
	 * remains the same and avoid recalculating it, as the connector's bpc
	 * may have changed after the state was duplicated
	 */
	if (!state->duplicated) {
		const int clock = crtc_state->adjusted_mode.clock;

		asyh->or.bpc = connector->display_info.bpc;
		asyh->dp.pbn = drm_dp_calc_pbn_mode(clock, asyh->or.bpc * 3 << 4);
	}

	mst_state = drm_atomic_get_mst_topology_state(state, &mstm->mgr);
	if (IS_ERR(mst_state))
		return PTR_ERR(mst_state);

	if (!mst_state->pbn_div.full) {
		struct nouveau_encoder *outp = mstc->mstm->outp;

		mst_state->pbn_div = drm_dp_get_vc_payload_bw(&mstm->mgr,
							      outp->dp.link_bw, outp->dp.link_nr);
	}

	slots = drm_dp_atomic_find_time_slots(state, &mstm->mgr, mstc->port, asyh->dp.pbn);
	if (slots < 0)
		return slots;

	asyh->dp.tu = slots;

	return 0;
}

static u8
nv50_dp_bpc_to_depth(unsigned int bpc)
{
	switch (bpc) {
	case  6: return NV837D_SOR_SET_CONTROL_PIXEL_DEPTH_BPP_18_444;
	case  8: return NV837D_SOR_SET_CONTROL_PIXEL_DEPTH_BPP_24_444;
	case 10:
	default: return NV837D_SOR_SET_CONTROL_PIXEL_DEPTH_BPP_30_444;
	}
}

static void
nv50_msto_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
	struct nv50_msto *msto = nv50_msto(encoder);
	struct nv50_head *head = msto->head;
	struct nv50_head_atom *asyh =
		nv50_head_atom(drm_atomic_get_new_crtc_state(state, &head->base.base));
	struct nv50_mstc *mstc = NULL;
	struct nv50_mstm *mstm = NULL;
	struct drm_connector *connector;
	struct drm_connector_list_iter conn_iter;
	u8 proto;

	drm_connector_list_iter_begin(encoder->dev, &conn_iter);
	drm_for_each_connector_iter(connector, &conn_iter) {
		if (connector->state->best_encoder == &msto->encoder) {
			mstc = nv50_mstc(connector);
			mstm = mstc->mstm;
			break;
		}
	}
	drm_connector_list_iter_end(&conn_iter);

	if (WARN_ON(!mstc))
		return;

	if (!mstm->links++) {
		nvif_outp_acquire_sor(&mstm->outp->outp, false /*TODO: MST audio... */);
		nouveau_dp_train(mstm->outp, true, 0, 0);
	}

	if (head->func->display_id) {
		if (!WARN_ON(nvif_outp_dp_mst_id_get(&mstm->outp->outp, &msto->display_id)))
			head->func->display_id(head, msto->display_id);
	}

	if (mstm->outp->outp.or.link & 1)
		proto = NV917D_SOR_SET_CONTROL_PROTOCOL_DP_A;
	else
		proto = NV917D_SOR_SET_CONTROL_PROTOCOL_DP_B;

	mstm->outp->update(mstm->outp, head->base.index, asyh, proto,
			   nv50_dp_bpc_to_depth(asyh->or.bpc));

	msto->mstc = mstc;
	msto->enabled = true;
	mstm->modified = true;
}

static void
nv50_msto_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
	struct nv50_msto *msto = nv50_msto(encoder);
	struct nv50_mstc *mstc = msto->mstc;
	struct nv50_mstm *mstm = mstc->mstm;

	if (msto->head->func->display_id)
		msto->head->func->display_id(msto->head, 0);

	mstm->outp->update(mstm->outp, msto->head->base.index, NULL, 0, 0);
	mstm->modified = true;
	if (!--mstm->links)
		mstm->disabled = true;
	msto->disabled = true;
}

static const struct drm_encoder_helper_funcs
nv50_msto_help = {
	.atomic_disable = nv50_msto_atomic_disable,
	.atomic_enable = nv50_msto_atomic_enable,
	.atomic_check = nv50_msto_atomic_check,
};

static void
nv50_msto_destroy(struct drm_encoder *encoder)
{
	struct nv50_msto *msto = nv50_msto(encoder);
	drm_encoder_cleanup(&msto->encoder);
	kfree(msto);
}

static const struct drm_encoder_funcs
nv50_msto = {
	.destroy = nv50_msto_destroy,
};

static struct nv50_msto *
nv50_msto_new(struct drm_device *dev, struct nv50_head *head, int id)
{
	struct nv50_msto *msto;
	int ret;

	msto = kzalloc(sizeof(*msto), GFP_KERNEL);
	if (!msto)
		return ERR_PTR(-ENOMEM);

	ret = drm_encoder_init(dev, &msto->encoder, &nv50_msto,
			       DRM_MODE_ENCODER_DPMST, "mst-%d", id);
	if (ret) {
		kfree(msto);
		return ERR_PTR(ret);
	}

	drm_encoder_helper_add(&msto->encoder, &nv50_msto_help);
	msto->encoder.possible_crtcs = drm_crtc_mask(&head->base.base);
	msto->head = head;
	return msto;
}

static struct drm_encoder *
nv50_mstc_atomic_best_encoder(struct drm_connector *connector,
			      struct drm_atomic_state *state)
{
	struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
											 connector);
	struct nv50_mstc *mstc = nv50_mstc(connector);
	struct drm_crtc *crtc = connector_state->crtc;

	if (!(mstc->mstm->outp->dcb->heads & drm_crtc_mask(crtc)))
		return NULL;

	return &nv50_head(crtc)->msto->encoder;
}

static enum drm_mode_status
nv50_mstc_mode_valid(struct drm_connector *connector,
		     struct drm_display_mode *mode)
{
	struct nv50_mstc *mstc = nv50_mstc(connector);
	struct nouveau_encoder *outp = mstc->mstm->outp;

	/* TODO: calculate the PBN from the dotclock and validate against the
	 * MSTB's max possible PBN
	 */

	return nv50_dp_mode_valid(outp, mode, NULL);
}

static int
nv50_mstc_get_modes(struct drm_connector *connector)
{
	struct nv50_mstc *mstc = nv50_mstc(connector);
	int ret = 0;

	mstc->edid = drm_dp_mst_get_edid(&mstc->connector, mstc->port->mgr, mstc->port);
	drm_connector_update_edid_property(&mstc->connector, mstc->edid);
	if (mstc->edid)
		ret = drm_add_edid_modes(&mstc->connector, mstc->edid);

	/*
	 * XXX: Since we don't use HDR in userspace quite yet, limit the bpc
	 * to 8 to save bandwidth on the topology. In the future, we'll want
	 * to properly fix this by dynamically selecting the highest possible
	 * bpc that would fit in the topology
	 */
	if (connector->display_info.bpc)
		connector->display_info.bpc =
			clamp(connector->display_info.bpc, 6U, 8U);
	else
		connector->display_info.bpc = 8;

	if (mstc->native)
		drm_mode_destroy(mstc->connector.dev, mstc->native);
	mstc->native = nouveau_conn_native_mode(&mstc->connector);
	return ret;
}

static int
nv50_mstc_atomic_check(struct drm_connector *connector,
		       struct drm_atomic_state *state)
{
	struct nv50_mstc *mstc = nv50_mstc(connector);
	struct drm_dp_mst_topology_mgr *mgr = &mstc->mstm->mgr;

	return drm_dp_atomic_release_time_slots(state, mgr, mstc->port);
}

static int
nv50_mstc_detect(struct drm_connector *connector,
		 struct drm_modeset_acquire_ctx *ctx, bool force)
{
	struct nv50_mstc *mstc = nv50_mstc(connector);
	int ret;

	if (drm_connector_is_unregistered(connector))
		return connector_status_disconnected;

	ret = pm_runtime_get_sync(connector->dev->dev);
	if (ret < 0 && ret != -EACCES) {
		pm_runtime_put_autosuspend(connector->dev->dev);
		return connector_status_disconnected;
	}

	ret = drm_dp_mst_detect_port(connector, ctx, mstc->port->mgr,
				     mstc->port);
	if (ret != connector_status_connected)
		goto out;

out:
	pm_runtime_mark_last_busy(connector->dev->dev);
	pm_runtime_put_autosuspend(connector->dev->dev);
	return ret;
}

static const struct drm_connector_helper_funcs
nv50_mstc_help = {
	.get_modes = nv50_mstc_get_modes,
	.mode_valid = nv50_mstc_mode_valid,
	.atomic_best_encoder = nv50_mstc_atomic_best_encoder,
	.atomic_check = nv50_mstc_atomic_check,
	.detect_ctx = nv50_mstc_detect,
};

static void
nv50_mstc_destroy(struct drm_connector *connector)
{
	struct nv50_mstc *mstc = nv50_mstc(connector);

	drm_connector_cleanup(&mstc->connector);
	drm_dp_mst_put_port_malloc(mstc->port);

	kfree(mstc);
}

static const struct drm_connector_funcs
nv50_mstc = {
	.reset = nouveau_conn_reset,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = nv50_mstc_destroy,
	.atomic_duplicate_state = nouveau_conn_atomic_duplicate_state,
	.atomic_destroy_state = nouveau_conn_atomic_destroy_state,
	.atomic_set_property = nouveau_conn_atomic_set_property,
	.atomic_get_property = nouveau_conn_atomic_get_property,
};

static int
nv50_mstc_new(struct nv50_mstm *mstm, struct drm_dp_mst_port *port,
	      const char *path, struct nv50_mstc **pmstc)
{
	struct drm_device *dev = mstm->outp->base.base.dev;
	struct drm_crtc *crtc;
	struct nv50_mstc *mstc;
	int ret;

	if (!(mstc = *pmstc = kzalloc(sizeof(*mstc), GFP_KERNEL)))
		return -ENOMEM;
	mstc->mstm = mstm;
	mstc->port = port;

	ret = drm_connector_init(dev, &mstc->connector, &nv50_mstc,
				 DRM_MODE_CONNECTOR_DisplayPort);
	if (ret) {
		kfree(*pmstc);
		*pmstc = NULL;
		return ret;
	}

	drm_connector_helper_add(&mstc->connector, &nv50_mstc_help);

	mstc->connector.funcs->reset(&mstc->connector);
	nouveau_conn_attach_properties(&mstc->connector);

	drm_for_each_crtc(crtc, dev) {
		if (!(mstm->outp->dcb->heads & drm_crtc_mask(crtc)))
			continue;

		drm_connector_attach_encoder(&mstc->connector,
					     &nv50_head(crtc)->msto->encoder);
	}

	drm_object_attach_property(&mstc->connector.base, dev->mode_config.path_property, 0);
	drm_object_attach_property(&mstc->connector.base, dev->mode_config.tile_property, 0);
	drm_connector_set_path_property(&mstc->connector, path);
	drm_dp_mst_get_port_malloc(port);
	return 0;
}

static void
nv50_mstm_cleanup(struct drm_atomic_state *state,
		  struct drm_dp_mst_topology_state *mst_state,
		  struct nv50_mstm *mstm)
{
	struct nouveau_drm *drm = nouveau_drm(mstm->outp->base.base.dev);
	struct drm_encoder *encoder;

	NV_ATOMIC(drm, "%s: mstm cleanup\n", mstm->outp->base.base.name);
	drm_dp_check_act_status(&mstm->mgr);

	drm_for_each_encoder(encoder, mstm->outp->base.base.dev) {
		if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST) {
			struct nv50_msto *msto = nv50_msto(encoder);
			struct nv50_mstc *mstc = msto->mstc;
			if (mstc && mstc->mstm == mstm)
				nv50_msto_cleanup(state, mst_state, &mstm->mgr, msto);
		}
	}

	if (mstm->disabled) {
		nouveau_dp_power_down(mstm->outp);
		nvif_outp_release(&mstm->outp->outp);
		mstm->disabled = false;
	}

	mstm->modified = false;
}

static void
nv50_mstm_prepare(struct drm_atomic_state *state,
		  struct drm_dp_mst_topology_state *mst_state,
		  struct nv50_mstm *mstm)
{
	struct nouveau_drm *drm = nouveau_drm(mstm->outp->base.base.dev);
	struct drm_encoder *encoder;

	NV_ATOMIC(drm, "%s: mstm prepare\n", mstm->outp->base.base.name);

	/* Disable payloads first */
	drm_for_each_encoder(encoder, mstm->outp->base.base.dev) {
		if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST) {
			struct nv50_msto *msto = nv50_msto(encoder);
			struct nv50_mstc *mstc = msto->mstc;
			if (mstc && mstc->mstm == mstm && msto->disabled)
				nv50_msto_prepare(state, mst_state, &mstm->mgr, msto);
		}
	}

	/* Add payloads for new heads, while also updating the start slots of any unmodified (but
	 * active) heads that may have had their VC slots shifted left after the previous step
	 */
	drm_for_each_encoder(encoder, mstm->outp->base.base.dev) {
		if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST) {
			struct nv50_msto *msto = nv50_msto(encoder);
			struct nv50_mstc *mstc = msto->mstc;
			if (mstc && mstc->mstm == mstm && !msto->disabled)
				nv50_msto_prepare(state, mst_state, &mstm->mgr, msto);
		}
	}
}

static struct drm_connector *
nv50_mstm_add_connector(struct drm_dp_mst_topology_mgr *mgr,
			struct drm_dp_mst_port *port, const char *path)
{
	struct nv50_mstm *mstm = nv50_mstm(mgr);
	struct nv50_mstc *mstc;
	int ret;

	ret = nv50_mstc_new(mstm, port, path, &mstc);
	if (ret)
		return NULL;

	return &mstc->connector;
}

static const struct drm_dp_mst_topology_cbs
nv50_mstm = {
	.add_connector = nv50_mstm_add_connector,
};

bool
nv50_mstm_service(struct nouveau_drm *drm,
		  struct nouveau_connector *nv_connector,
		  struct nv50_mstm *mstm)
{
	struct drm_dp_aux *aux = &nv_connector->aux;
	bool handled = true, ret = true;
	int rc;
	u8 esi[8] = {};

	while (handled) {
		u8 ack[8] = {};

		rc = drm_dp_dpcd_read(aux, DP_SINK_COUNT_ESI, esi, 8);
		if (rc != 8) {
			ret = false;
			break;
		}

		drm_dp_mst_hpd_irq_handle_event(&mstm->mgr, esi, ack, &handled);
		if (!handled)
			break;

		rc = drm_dp_dpcd_writeb(aux, DP_SINK_COUNT_ESI + 1, ack[1]);

		if (rc != 1) {
			ret = false;
			break;
		}

		drm_dp_mst_hpd_irq_send_new_request(&mstm->mgr);
	}

	if (!ret)
		NV_DEBUG(drm, "Failed to handle ESI on %s: %d\n",
			 nv_connector->base.name, rc);

	return ret;
}

void
nv50_mstm_remove(struct nv50_mstm *mstm)
{
	mstm->is_mst = false;
	drm_dp_mst_topology_mgr_set_mst(&mstm->mgr, false);
}

int
nv50_mstm_detect(struct nouveau_encoder *outp)
{
	struct nv50_mstm *mstm = outp->dp.mstm;
	struct drm_dp_aux *aux;
	int ret;

	if (!mstm || !mstm->can_mst)
		return 0;

	aux = mstm->mgr.aux;

	/* Clear any leftover MST state we didn't set ourselves by first
	 * disabling MST if it was already enabled
	 */
	ret = drm_dp_dpcd_writeb(aux, DP_MSTM_CTRL, 0);
	if (ret < 0)
		return ret;

	/* And start enabling */
	ret = drm_dp_mst_topology_mgr_set_mst(&mstm->mgr, true);
	if (ret)
		return ret;

	mstm->is_mst = true;
	return 1;
}

static void
nv50_mstm_fini(struct nouveau_encoder *outp)
{
	struct nv50_mstm *mstm = outp->dp.mstm;

	if (!mstm)
		return;

	/* Don't change the MST state of this connector until we've finished
	 * resuming, since we can't safely grab hpd_irq_lock in our resume
	 * path to protect mstm->is_mst without potentially deadlocking
	 */
	mutex_lock(&outp->dp.hpd_irq_lock);
	mstm->suspended = true;
	mutex_unlock(&outp->dp.hpd_irq_lock);

	if (mstm->is_mst)
		drm_dp_mst_topology_mgr_suspend(&mstm->mgr);
}

static void
nv50_mstm_init(struct nouveau_encoder *outp, bool runtime)
{
	struct nv50_mstm *mstm = outp->dp.mstm;
	int ret = 0;

	if (!mstm)
		return;

	if (mstm->is_mst) {
		ret = drm_dp_mst_topology_mgr_resume(&mstm->mgr, !runtime);
		if (ret == -1)
			nv50_mstm_remove(mstm);
	}

	mutex_lock(&outp->dp.hpd_irq_lock);
	mstm->suspended = false;
	mutex_unlock(&outp->dp.hpd_irq_lock);

	if (ret == -1)
		drm_kms_helper_hotplug_event(mstm->mgr.dev);
}

static void
nv50_mstm_del(struct nv50_mstm **pmstm)
{
	struct nv50_mstm *mstm = *pmstm;
	if (mstm) {
		drm_dp_mst_topology_mgr_destroy(&mstm->mgr);
		kfree(*pmstm);
		*pmstm = NULL;
	}
}

static int
nv50_mstm_new(struct nouveau_encoder *outp, struct drm_dp_aux *aux, int aux_max,
	      int conn_base_id, struct nv50_mstm **pmstm)
{
	const int max_payloads = hweight8(outp->dcb->heads);
	struct drm_device *dev = outp->base.base.dev;
	struct nv50_mstm *mstm;
	int ret;

	if (!(mstm = *pmstm = kzalloc(sizeof(*mstm), GFP_KERNEL)))
		return -ENOMEM;
	mstm->outp = outp;
	mstm->mgr.cbs = &nv50_mstm;

	ret = drm_dp_mst_topology_mgr_init(&mstm->mgr, dev, aux, aux_max,
					   max_payloads, conn_base_id);
	if (ret)
		return ret;

	return 0;
}

/******************************************************************************
 * SOR
 *****************************************************************************/
static void
nv50_sor_update(struct nouveau_encoder *nv_encoder, u8 head,
		struct nv50_head_atom *asyh, u8 proto, u8 depth)
{
	struct nv50_disp *disp = nv50_disp(nv_encoder->base.base.dev);
	struct nv50_core *core = disp->core;

	if (!asyh) {
		nv_encoder->ctrl &= ~BIT(head);
		if (NVDEF_TEST(nv_encoder->ctrl, NV507D, SOR_SET_CONTROL, OWNER, ==, NONE))
			nv_encoder->ctrl = 0;
	} else {
		nv_encoder->ctrl |= NVVAL(NV507D, SOR_SET_CONTROL, PROTOCOL, proto);
		nv_encoder->ctrl |= BIT(head);
		asyh->or.depth = depth;
	}

	core->func->sor->ctrl(core, nv_encoder->outp.or.id, nv_encoder->ctrl, asyh);
}

/* TODO: Should we extend this to PWM-only backlights?
 * As well, should we add a DRM helper for waiting for the backlight to acknowledge
 * the panel backlight has been shut off? Intel doesn't seem to do this, and uses a
 * fixed time delay from the vbios…
 */
static void
nv50_sor_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nv50_head *head = nv50_head(nv_encoder->crtc);
#ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT
	struct nouveau_connector *nv_connector = nv50_outp_get_old_connector(state, nv_encoder);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nouveau_backlight *backlight = nv_connector->backlight;
	struct drm_dp_aux *aux = &nv_connector->aux;
	int ret;

	if (backlight && backlight->uses_dpcd) {
		ret = drm_edp_backlight_disable(aux, &backlight->edp_info);
		if (ret < 0)
			NV_ERROR(drm, "Failed to disable backlight on [CONNECTOR:%d:%s]: %d\n",
				 nv_connector->base.base.id, nv_connector->base.name, ret);
	}
#endif

	if (nv_encoder->dcb->type == DCB_OUTPUT_TMDS && nv_encoder->hdmi.enabled) {
		nvif_outp_hdmi(&nv_encoder->outp, head->base.index,
			       false, 0, 0, 0, false, false, false);
		nv_encoder->hdmi.enabled = false;
	}

	if (nv_encoder->dcb->type == DCB_OUTPUT_DP)
		nouveau_dp_power_down(nv_encoder);

	if (head->func->display_id)
		head->func->display_id(head, 0);

	nv_encoder->update(nv_encoder, head->base.index, NULL, 0, 0);
	nv50_audio_disable(encoder, &head->base);
	nv_encoder->crtc = NULL;
}

// common/inc/displayport/displayport.h
#define DP_CONFIG_WATERMARK_ADJUST                   2
#define DP_CONFIG_WATERMARK_LIMIT                   20
#define DP_CONFIG_INCREASED_WATERMARK_ADJUST         8
#define DP_CONFIG_INCREASED_WATERMARK_LIMIT         22

static bool
nv50_sor_dp_watermark_sst(struct nouveau_encoder *outp,
			  struct nv50_head *head, struct nv50_head_atom *asyh)
{
	bool enhancedFraming = outp->dp.dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP;
	u64 minRate = outp->dp.link_bw * 1000;
	unsigned tuSize = 64;
	unsigned waterMark;
	unsigned hBlankSym;
	unsigned vBlankSym;
	unsigned watermarkAdjust = DP_CONFIG_WATERMARK_ADJUST;
	unsigned watermarkMinimum = DP_CONFIG_WATERMARK_LIMIT;
	// depth is multiplied by 16 in case of DSC enable
	s32 hblank_symbols;
	// number of link clocks per line.
	int vblank_symbols	  = 0;
	bool bEnableDsc = false;
	unsigned surfaceWidth = asyh->mode.h.blanks - asyh->mode.h.blanke;
	unsigned rasterWidth = asyh->mode.h.active;
	unsigned depth = asyh->or.bpc * 3;
	unsigned DSC_FACTOR = bEnableDsc ? 16 : 1;
	u64 pixelClockHz = asyh->mode.clock * 1000;
	u64 PrecisionFactor = 100000, ratioF, watermarkF;
	u32 numLanesPerLink = outp->dp.link_nr;
	u32 numSymbolsPerLine;
	u32 BlankingBits;
	u32 surfaceWidthPerLink;
	u32 PixelSteeringBits;
	u64 NumBlankingLinkClocks;
	u32 MinHBlank;

	if (outp->outp.info.dp.increased_wm) {
		watermarkAdjust = DP_CONFIG_INCREASED_WATERMARK_ADJUST;
		watermarkMinimum = DP_CONFIG_INCREASED_WATERMARK_LIMIT;
	}

	if ((pixelClockHz * depth) >= (8 * minRate * outp->dp.link_nr * DSC_FACTOR))
	{
		return false;
	}

	//
	// For DSC, if (pclk * bpp) < (1/64 * orclk * 8 * lanes) then some TU may end up with
	// 0 active symbols. This may cause HW hang. Bug 200379426
	//
	if ((bEnableDsc) &&
	    ((pixelClockHz * depth) < div_u64(8 * minRate * outp->dp.link_nr * DSC_FACTOR, 64)))
	{
		return false;
	}

	//
	//  Perform the SST calculation.
	//	For auto mode the watermark calculation does not need to track accumulated error the
	//	formulas for manual mode will not work.  So below calculation was extracted from the DTB.
	//
	ratioF = div_u64((u64)pixelClockHz * depth * PrecisionFactor, DSC_FACTOR);

	ratioF = div_u64(ratioF, 8 * (u64) minRate * outp->dp.link_nr);

	if (PrecisionFactor < ratioF) // Assert if we will end up with a negative number in below
		return false;

	watermarkF = div_u64(ratioF * tuSize * (PrecisionFactor - ratioF), PrecisionFactor);
	waterMark = (unsigned)(watermarkAdjust + (div_u64(2 * div_u64(depth * PrecisionFactor, 8 * numLanesPerLink * DSC_FACTOR) + watermarkF, PrecisionFactor)));

	//
	//  Bounds check the watermark
	//
	numSymbolsPerLine = div_u64(surfaceWidth * depth, 8 * outp->dp.link_nr * DSC_FACTOR);

	if (WARN_ON(waterMark > 39 || waterMark > numSymbolsPerLine))
		return false;

	//
	//  Clamp the low side
	//
	if (waterMark < watermarkMinimum)
		waterMark = watermarkMinimum;

	//Bits to send BS/BE/Extra symbols due to pixel padding
	//Also accounts for enhanced framing.
	BlankingBits = 3*8*numLanesPerLink + (enhancedFraming ? 3*8*numLanesPerLink : 0);

	//VBID/MVID/MAUD sent 4 times all the time
	BlankingBits += 3*8*4;

	surfaceWidthPerLink = surfaceWidth;

	//Extra bits sent due to pixel steering
	u32 remain;
	div_u64_rem(surfaceWidthPerLink, numLanesPerLink, &remain);
	PixelSteeringBits = remain ? div_u64((numLanesPerLink - remain) * depth, DSC_FACTOR) : 0;

	BlankingBits += PixelSteeringBits;
	NumBlankingLinkClocks = div_u64((u64)BlankingBits * PrecisionFactor, (8 * numLanesPerLink));
	MinHBlank = (u32)(div_u64(div_u64(NumBlankingLinkClocks * pixelClockHz, minRate), PrecisionFactor));
	MinHBlank += 12;

	if (WARN_ON(MinHBlank > rasterWidth - surfaceWidth))
		return false;

	// Bug 702290 - Active Width should be greater than 60
	if (WARN_ON(surfaceWidth <= 60))
		return false;


	hblank_symbols = (s32)(div_u64((u64)(rasterWidth - surfaceWidth - MinHBlank) * minRate, pixelClockHz));

	//reduce HBlank Symbols to account for secondary data packet
	hblank_symbols -= 1; //Stuffer latency to send BS
	hblank_symbols -= 3; //SPKT latency to send data to stuffer

	hblank_symbols -= numLanesPerLink == 1 ? 9  : numLanesPerLink == 2 ? 6 : 3;

	hBlankSym = (hblank_symbols < 0) ? 0 : hblank_symbols;

	// Refer to dev_disp.ref for more information.
	// # symbols/vblank = ((SetRasterBlankEnd.X + SetRasterSize.Width - SetRasterBlankStart.X - 40) * link_clk / pclk) - Y - 1;
	// where Y = (# lanes == 4) 12 : (# lanes == 2) ? 21 : 39
	if (surfaceWidth < 40)
	{
		vblank_symbols = 0;
	}
	else
	{
		vblank_symbols = (s32)((div_u64((u64)(surfaceWidth - 40) * minRate, pixelClockHz))) - 1;

		vblank_symbols -= numLanesPerLink == 1 ? 39  : numLanesPerLink == 2 ? 21 : 12;
	}

	vBlankSym = (vblank_symbols < 0) ? 0 : vblank_symbols;

	return nvif_outp_dp_sst(&outp->outp, head->base.index, waterMark, hBlankSym, vBlankSym);
}

static void
nv50_sor_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nouveau_crtc *nv_crtc = nv50_outp_get_new_crtc(state, nv_encoder);
	struct nv50_head_atom *asyh =
		nv50_head_atom(drm_atomic_get_new_crtc_state(state, &nv_crtc->base));
	struct drm_display_mode *mode = &asyh->state.adjusted_mode;
	struct nv50_disp *disp = nv50_disp(encoder->dev);
	struct nv50_head *head = nv50_head(&nv_crtc->base);
	struct nvif_outp *outp = &nv_encoder->outp;
	struct drm_device *dev = encoder->dev;
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nouveau_connector *nv_connector;
#ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT
	struct nouveau_backlight *backlight;
#endif
	struct nvbios *bios = &drm->vbios;
	bool lvds_dual = false, lvds_8bpc = false, hda = false;
	u8 proto = NV507D_SOR_SET_CONTROL_PROTOCOL_CUSTOM;
	u8 depth = NV837D_SOR_SET_CONTROL_PIXEL_DEPTH_DEFAULT;

	nv_connector = nv50_outp_get_new_connector(state, nv_encoder);
	nv_encoder->crtc = &nv_crtc->base;

	if ((disp->disp->object.oclass == GT214_DISP ||
	     disp->disp->object.oclass >= GF110_DISP) &&
	    nv_encoder->dcb->type != DCB_OUTPUT_LVDS &&
	    drm_detect_monitor_audio(nv_connector->edid))
		hda = true;

	if (!nvif_outp_acquired(outp))
		nvif_outp_acquire_sor(outp, hda);

	switch (nv_encoder->dcb->type) {
	case DCB_OUTPUT_TMDS:
		if (disp->disp->object.oclass != NV50_DISP &&
		    drm_detect_hdmi_monitor(nv_connector->edid))
			nv50_hdmi_enable(encoder, nv_crtc, nv_connector, state, mode, hda);

		if (nv_encoder->outp.or.link & 1) {
			proto = NV507D_SOR_SET_CONTROL_PROTOCOL_SINGLE_TMDS_A;
			/* Only enable dual-link if:
			 *  - Need to (i.e. rate > 165MHz)
			 *  - DCB says we can
			 *  - Not an HDMI monitor, since there's no dual-link
			 *    on HDMI.
			 */
			if (mode->clock >= 165000 &&
			    nv_encoder->dcb->duallink_possible &&
			    !drm_detect_hdmi_monitor(nv_connector->edid))
				proto = NV507D_SOR_SET_CONTROL_PROTOCOL_DUAL_TMDS;
		} else {
			proto = NV507D_SOR_SET_CONTROL_PROTOCOL_SINGLE_TMDS_B;
		}
		break;
	case DCB_OUTPUT_LVDS:
		proto = NV507D_SOR_SET_CONTROL_PROTOCOL_LVDS_CUSTOM;

		if (bios->fp_no_ddc) {
			lvds_dual = bios->fp.dual_link;
			lvds_8bpc = bios->fp.if_is_24bit;
		} else {
			if (nv_connector->type == DCB_CONNECTOR_LVDS_SPWG) {
				if (((u8 *)nv_connector->edid)[121] == 2)
					lvds_dual = true;
			} else
			if (mode->clock >= bios->fp.duallink_transition_clk) {
				lvds_dual = true;
			}

			if (lvds_dual) {
				if (bios->fp.strapless_is_24bit & 2)
					lvds_8bpc = true;
			} else {
				if (bios->fp.strapless_is_24bit & 1)
					lvds_8bpc = true;
			}

			if (asyh->or.bpc == 8)
				lvds_8bpc = true;
		}

		nvif_outp_lvds(&nv_encoder->outp, lvds_dual, lvds_8bpc);
		break;
	case DCB_OUTPUT_DP:
		nouveau_dp_train(nv_encoder, false, mode->clock, asyh->or.bpc);
		nv50_sor_dp_watermark_sst(nv_encoder, head, asyh);
		depth = nv50_dp_bpc_to_depth(asyh->or.bpc);

		if (nv_encoder->outp.or.link & 1)
			proto = NV887D_SOR_SET_CONTROL_PROTOCOL_DP_A;
		else
			proto = NV887D_SOR_SET_CONTROL_PROTOCOL_DP_B;

#ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT
		backlight = nv_connector->backlight;
		if (backlight && backlight->uses_dpcd)
			drm_edp_backlight_enable(&nv_connector->aux, &backlight->edp_info,
						 (u16)backlight->dev->props.brightness);
#endif

		break;
	default:
		BUG();
		break;
	}

	if (head->func->display_id)
		head->func->display_id(head, BIT(nv_encoder->outp.id));

	nv_encoder->update(nv_encoder, nv_crtc->index, asyh, proto, depth);
}

static const struct drm_encoder_helper_funcs
nv50_sor_help = {
	.atomic_check = nv50_outp_atomic_check,
	.atomic_enable = nv50_sor_atomic_enable,
	.atomic_disable = nv50_sor_atomic_disable,
};

static void
nv50_sor_destroy(struct drm_encoder *encoder)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);

	nv50_mstm_del(&nv_encoder->dp.mstm);
	drm_encoder_cleanup(encoder);

	if (nv_encoder->dcb->type == DCB_OUTPUT_DP)
		mutex_destroy(&nv_encoder->dp.hpd_irq_lock);

	nvif_outp_dtor(&nv_encoder->outp);
	kfree(encoder);
}

static const struct drm_encoder_funcs
nv50_sor_func = {
	.destroy = nv50_sor_destroy,
};

static int
nv50_sor_create(struct nouveau_encoder *nv_encoder)
{
	struct drm_connector *connector = &nv_encoder->conn->base;
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct nouveau_drm *drm = nouveau_drm(connector->dev);
	struct nvkm_i2c *i2c = nvxx_i2c(&drm->client.device);
	struct drm_encoder *encoder;
	struct dcb_output *dcbe = nv_encoder->dcb;
	struct nv50_disp *disp = nv50_disp(connector->dev);
	int type, ret;

	switch (dcbe->type) {
	case DCB_OUTPUT_LVDS: type = DRM_MODE_ENCODER_LVDS; break;
	case DCB_OUTPUT_TMDS:
	case DCB_OUTPUT_DP:
	default:
		type = DRM_MODE_ENCODER_TMDS;
		break;
	}

	nv_encoder->update = nv50_sor_update;

	encoder = to_drm_encoder(nv_encoder);
	drm_encoder_init(connector->dev, encoder, &nv50_sor_func, type,
			 "sor-%04x-%04x", dcbe->hasht, dcbe->hashm);
	drm_encoder_helper_add(encoder, &nv50_sor_help);

	drm_connector_attach_encoder(connector, encoder);

	disp->core->func->sor->get_caps(disp, nv_encoder, ffs(dcbe->or) - 1);
	nv50_outp_dump_caps(drm, nv_encoder);

	if (dcbe->type == DCB_OUTPUT_DP) {
		mutex_init(&nv_encoder->dp.hpd_irq_lock);

		if (disp->disp->object.oclass < GF110_DISP) {
			/* HW has no support for address-only
			 * transactions, so we're required to
			 * use custom I2C-over-AUX code.
			 */
			struct nvkm_i2c_aux *aux;

			aux = nvkm_i2c_aux_find(i2c, dcbe->i2c_index);
			if (!aux)
				return -EINVAL;

			nv_encoder->i2c = &aux->i2c;
		} else {
			nv_encoder->i2c = &nv_connector->aux.ddc;
		}

		if (nv_connector->type != DCB_CONNECTOR_eDP && nv_encoder->outp.info.dp.mst) {
			ret = nv50_mstm_new(nv_encoder, &nv_connector->aux,
					    16, nv_connector->base.base.id,
					    &nv_encoder->dp.mstm);
			if (ret)
				return ret;
		}
	} else
	if (nv_encoder->outp.info.ddc != NVIF_OUTP_DDC_INVALID) {
		struct nvkm_i2c_bus *bus =
			nvkm_i2c_bus_find(i2c, dcbe->i2c_index);
		if (bus)
			nv_encoder->i2c = &bus->i2c;
	}

	return 0;
}

/******************************************************************************
 * PIOR
 *****************************************************************************/
static int
nv50_pior_atomic_check(struct drm_encoder *encoder,
		       struct drm_crtc_state *crtc_state,
		       struct drm_connector_state *conn_state)
{
	int ret = nv50_outp_atomic_check(encoder, crtc_state, conn_state);
	if (ret)
		return ret;
	crtc_state->adjusted_mode.clock *= 2;
	return 0;
}

static void
nv50_pior_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nv50_core *core = nv50_disp(encoder->dev)->core;
	const u32 ctrl = NVDEF(NV507D, PIOR_SET_CONTROL, OWNER, NONE);

	core->func->pior->ctrl(core, nv_encoder->outp.or.id, ctrl, NULL);
	nv_encoder->crtc = NULL;
}

static void
nv50_pior_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nouveau_crtc *nv_crtc = nv50_outp_get_new_crtc(state, nv_encoder);
	struct nv50_head_atom *asyh =
		nv50_head_atom(drm_atomic_get_new_crtc_state(state, &nv_crtc->base));
	struct nv50_core *core = nv50_disp(encoder->dev)->core;
	u32 ctrl = 0;

	switch (nv_crtc->index) {
	case 0: ctrl |= NVDEF(NV507D, PIOR_SET_CONTROL, OWNER, HEAD0); break;
	case 1: ctrl |= NVDEF(NV507D, PIOR_SET_CONTROL, OWNER, HEAD1); break;
	default:
		WARN_ON(1);
		break;
	}

	switch (asyh->or.bpc) {
	case 10: asyh->or.depth = NV837D_PIOR_SET_CONTROL_PIXEL_DEPTH_BPP_30_444; break;
	case  8: asyh->or.depth = NV837D_PIOR_SET_CONTROL_PIXEL_DEPTH_BPP_24_444; break;
	case  6: asyh->or.depth = NV837D_PIOR_SET_CONTROL_PIXEL_DEPTH_BPP_18_444; break;
	default: asyh->or.depth = NV837D_PIOR_SET_CONTROL_PIXEL_DEPTH_DEFAULT; break;
	}

	if (!nvif_outp_acquired(&nv_encoder->outp))
		nvif_outp_acquire_pior(&nv_encoder->outp);

	switch (nv_encoder->dcb->type) {
	case DCB_OUTPUT_TMDS:
		ctrl |= NVDEF(NV507D, PIOR_SET_CONTROL, PROTOCOL, EXT_TMDS_ENC);
		break;
	case DCB_OUTPUT_DP:
		ctrl |= NVDEF(NV507D, PIOR_SET_CONTROL, PROTOCOL, EXT_TMDS_ENC);
		nouveau_dp_train(nv_encoder, false, asyh->state.adjusted_mode.clock, 6);
		break;
	default:
		BUG();
		break;
	}

	core->func->pior->ctrl(core, nv_encoder->outp.or.id, ctrl, asyh);
	nv_encoder->crtc = &nv_crtc->base;
}

static const struct drm_encoder_helper_funcs
nv50_pior_help = {
	.atomic_check = nv50_pior_atomic_check,
	.atomic_enable = nv50_pior_atomic_enable,
	.atomic_disable = nv50_pior_atomic_disable,
};

static void
nv50_pior_destroy(struct drm_encoder *encoder)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);

	nvif_outp_dtor(&nv_encoder->outp);

	drm_encoder_cleanup(encoder);

	mutex_destroy(&nv_encoder->dp.hpd_irq_lock);
	kfree(encoder);
}

static const struct drm_encoder_funcs
nv50_pior_func = {
	.destroy = nv50_pior_destroy,
};

static int
nv50_pior_create(struct nouveau_encoder *nv_encoder)
{
	struct drm_connector *connector = &nv_encoder->conn->base;
	struct drm_device *dev = connector->dev;
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nv50_disp *disp = nv50_disp(dev);
	struct nvkm_i2c *i2c = nvxx_i2c(&drm->client.device);
	struct nvkm_i2c_bus *bus = NULL;
	struct nvkm_i2c_aux *aux = NULL;
	struct i2c_adapter *ddc;
	struct drm_encoder *encoder;
	struct dcb_output *dcbe = nv_encoder->dcb;
	int type;

	switch (dcbe->type) {
	case DCB_OUTPUT_TMDS:
		bus  = nvkm_i2c_bus_find(i2c, nv_encoder->outp.info.ddc);
		ddc  = bus ? &bus->i2c : NULL;
		type = DRM_MODE_ENCODER_TMDS;
		break;
	case DCB_OUTPUT_DP:
		aux  = nvkm_i2c_aux_find(i2c, nv_encoder->outp.info.dp.aux);
		ddc  = aux ? &aux->i2c : NULL;
		type = DRM_MODE_ENCODER_TMDS;
		break;
	default:
		return -ENODEV;
	}

	nv_encoder->i2c = ddc;

	mutex_init(&nv_encoder->dp.hpd_irq_lock);

	encoder = to_drm_encoder(nv_encoder);
	drm_encoder_init(connector->dev, encoder, &nv50_pior_func, type,
			 "pior-%04x-%04x", dcbe->hasht, dcbe->hashm);
	drm_encoder_helper_add(encoder, &nv50_pior_help);

	drm_connector_attach_encoder(connector, encoder);

	disp->core->func->pior->get_caps(disp, nv_encoder, ffs(dcbe->or) - 1);
	nv50_outp_dump_caps(drm, nv_encoder);

	return 0;
}

/******************************************************************************
 * Atomic
 *****************************************************************************/

static void
nv50_disp_atomic_commit_core(struct drm_atomic_state *state, u32 *interlock)
{
	struct drm_dp_mst_topology_mgr *mgr;
	struct drm_dp_mst_topology_state *mst_state;
	struct nouveau_drm *drm = nouveau_drm(state->dev);
	struct nv50_disp *disp = nv50_disp(drm->dev);
	struct nv50_atom *atom = nv50_atom(state);
	struct nv50_core *core = disp->core;
	struct nv50_outp_atom *outp;
	struct nv50_mstm *mstm;
	int i;

	NV_ATOMIC(drm, "commit core %08x\n", interlock[NV50_DISP_INTERLOCK_BASE]);

	for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
		mstm = nv50_mstm(mgr);
		if (mstm->modified)
			nv50_mstm_prepare(state, mst_state, mstm);
	}

	core->func->ntfy_init(disp->sync, NV50_DISP_CORE_NTFY);
	core->func->update(core, interlock, true);
	if (core->func->ntfy_wait_done(disp->sync, NV50_DISP_CORE_NTFY,
				       disp->core->chan.base.device))
		NV_ERROR(drm, "core notifier timeout\n");

	for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
		mstm = nv50_mstm(mgr);
		if (mstm->modified)
			nv50_mstm_cleanup(state, mst_state, mstm);
	}

	list_for_each_entry(outp, &atom->outp, head) {
		if (outp->encoder->encoder_type != DRM_MODE_ENCODER_DPMST) {
			struct nouveau_encoder *nv_encoder = nouveau_encoder(outp->encoder);

			if (outp->enabled) {
				nv50_audio_enable(outp->encoder, nouveau_crtc(nv_encoder->crtc),
						  nv_encoder->conn, NULL, NULL);
				outp->enabled = outp->disabled = false;
			} else {
				if (outp->disabled) {
					nvif_outp_release(&nv_encoder->outp);
					outp->disabled = false;
				}
			}
		}
	}
}

static void
nv50_disp_atomic_commit_wndw(struct drm_atomic_state *state, u32 *interlock)
{
	struct drm_plane_state *new_plane_state;
	struct drm_plane *plane;
	int i;

	for_each_new_plane_in_state(state, plane, new_plane_state, i) {
		struct nv50_wndw *wndw = nv50_wndw(plane);
		if (interlock[wndw->interlock.type] & wndw->interlock.data) {
			if (wndw->func->update)
				wndw->func->update(wndw, interlock);
		}
	}
}

static void
nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
{
	struct drm_device *dev = state->dev;
	struct drm_crtc_state *new_crtc_state, *old_crtc_state;
	struct drm_crtc *crtc;
	struct drm_plane_state *new_plane_state;
	struct drm_plane *plane;
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nv50_disp *disp = nv50_disp(dev);
	struct nv50_atom *atom = nv50_atom(state);
	struct nv50_core *core = disp->core;
	struct nv50_outp_atom *outp, *outt;
	u32 interlock[NV50_DISP_INTERLOCK__SIZE] = {};
	int i;
	bool flushed = false;

	NV_ATOMIC(drm, "commit %d %d\n", atom->lock_core, atom->flush_disable);
	nv50_crc_atomic_stop_reporting(state);
	drm_atomic_helper_wait_for_fences(dev, state, false);
	drm_atomic_helper_wait_for_dependencies(state);
	drm_dp_mst_atomic_wait_for_dependencies(state);
	drm_atomic_helper_update_legacy_modeset_state(dev, state);
	drm_atomic_helper_calc_timestamping_constants(state);

	if (atom->lock_core)
		mutex_lock(&disp->mutex);

	/* Disable head(s). */
	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
		struct nv50_head_atom *asyh = nv50_head_atom(new_crtc_state);
		struct nv50_head *head = nv50_head(crtc);

		NV_ATOMIC(drm, "%s: clr %04x (set %04x)\n", crtc->name,
			  asyh->clr.mask, asyh->set.mask);

		if (old_crtc_state->active && !new_crtc_state->active) {
			pm_runtime_put_noidle(dev->dev);
			drm_crtc_vblank_off(crtc);
		}

		if (asyh->clr.mask) {
			nv50_head_flush_clr(head, asyh, atom->flush_disable);
			interlock[NV50_DISP_INTERLOCK_CORE] |= 1;
		}
	}

	/* Disable plane(s). */
	for_each_new_plane_in_state(state, plane, new_plane_state, i) {
		struct nv50_wndw_atom *asyw = nv50_wndw_atom(new_plane_state);
		struct nv50_wndw *wndw = nv50_wndw(plane);

		NV_ATOMIC(drm, "%s: clr %02x (set %02x)\n", plane->name,
			  asyw->clr.mask, asyw->set.mask);
		if (!asyw->clr.mask)
			continue;

		nv50_wndw_flush_clr(wndw, interlock, atom->flush_disable, asyw);
	}

	/* Disable output path(s). */
	list_for_each_entry(outp, &atom->outp, head) {
		const struct drm_encoder_helper_funcs *help;
		struct drm_encoder *encoder;

		encoder = outp->encoder;
		help = encoder->helper_private;

		NV_ATOMIC(drm, "%s: clr %02x (set %02x)\n", encoder->name,
			  outp->clr.mask, outp->set.mask);

		if (outp->clr.mask) {
			help->atomic_disable(encoder, state);
			outp->disabled = true;
			interlock[NV50_DISP_INTERLOCK_CORE] |= 1;
		}
	}

	/* Flush disable. */
	if (interlock[NV50_DISP_INTERLOCK_CORE]) {
		if (atom->flush_disable) {
			nv50_disp_atomic_commit_wndw(state, interlock);
			nv50_disp_atomic_commit_core(state, interlock);
			memset(interlock, 0x00, sizeof(interlock));

			flushed = true;
		}
	}

	if (flushed)
		nv50_crc_atomic_release_notifier_contexts(state);
	nv50_crc_atomic_init_notifier_contexts(state);

	/* Update output path(s). */
	list_for_each_entry(outp, &atom->outp, head) {
		const struct drm_encoder_helper_funcs *help;
		struct drm_encoder *encoder;

		encoder = outp->encoder;
		help = encoder->helper_private;

		NV_ATOMIC(drm, "%s: set %02x (clr %02x)\n", encoder->name,
			  outp->set.mask, outp->clr.mask);

		if (outp->set.mask) {
			help->atomic_enable(encoder, state);
			outp->enabled = true;
			interlock[NV50_DISP_INTERLOCK_CORE] = 1;
		}
	}

	/* Update head(s). */
	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
		struct nv50_head_atom *asyh = nv50_head_atom(new_crtc_state);
		struct nv50_head *head = nv50_head(crtc);

		NV_ATOMIC(drm, "%s: set %04x (clr %04x)\n", crtc->name,
			  asyh->set.mask, asyh->clr.mask);

		if (asyh->set.mask) {
			nv50_head_flush_set(head, asyh);
			interlock[NV50_DISP_INTERLOCK_CORE] = 1;
		}

		if (new_crtc_state->active) {
			if (!old_crtc_state->active) {
				drm_crtc_vblank_on(crtc);
				pm_runtime_get_noresume(dev->dev);
			}
			if (new_crtc_state->event)
				drm_crtc_vblank_get(crtc);
		}
	}

	/* Update window->head assignment.
	 *
	 * This has to happen in an update that's not interlocked with
	 * any window channels to avoid hitting HW error checks.
	 *
	 *TODO: Proper handling of window ownership (Turing apparently
	 *      supports non-fixed mappings).
	 */
	if (core->assign_windows) {
		core->func->wndw.owner(core);
		nv50_disp_atomic_commit_core(state, interlock);
		core->assign_windows = false;
		interlock[NV50_DISP_INTERLOCK_CORE] = 0;
	}

	/* Finish updating head(s)...
	 *
	 * NVD is rather picky about both where window assignments can change,
	 * *and* about certain core and window channel states matching.
	 *
	 * The EFI GOP driver on newer GPUs configures window channels with a
	 * different output format to what we do, and the core channel update
	 * in the assign_windows case above would result in a state mismatch.
	 *
	 * Delay some of the head update until after that point to workaround
	 * the issue.  This only affects the initial modeset.
	 *
	 * TODO: handle this better when adding flexible window mapping
	 */
	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
		struct nv50_head_atom *asyh = nv50_head_atom(new_crtc_state);
		struct nv50_head *head = nv50_head(crtc);

		NV_ATOMIC(drm, "%s: set %04x (clr %04x)\n", crtc->name,
			  asyh->set.mask, asyh->clr.mask);

		if (asyh->set.mask) {
			nv50_head_flush_set_wndw(head, asyh);
			interlock[NV50_DISP_INTERLOCK_CORE] = 1;
		}
	}

	/* Update plane(s). */
	for_each_new_plane_in_state(state, plane, new_plane_state, i) {
		struct nv50_wndw_atom *asyw = nv50_wndw_atom(new_plane_state);
		struct nv50_wndw *wndw = nv50_wndw(plane);

		NV_ATOMIC(drm, "%s: set %02x (clr %02x)\n", plane->name,
			  asyw->set.mask, asyw->clr.mask);
		if ( !asyw->set.mask &&
		    (!asyw->clr.mask || atom->flush_disable))
			continue;

		nv50_wndw_flush_set(wndw, interlock, asyw);
	}

	/* Flush update. */
	nv50_disp_atomic_commit_wndw(state, interlock);

	if (interlock[NV50_DISP_INTERLOCK_CORE]) {
		if (interlock[NV50_DISP_INTERLOCK_BASE] ||
		    interlock[NV50_DISP_INTERLOCK_OVLY] ||
		    interlock[NV50_DISP_INTERLOCK_WNDW] ||
		    !atom->state.legacy_cursor_update)
			nv50_disp_atomic_commit_core(state, interlock);
		else
			disp->core->func->update(disp->core, interlock, false);
	}

	if (atom->lock_core)
		mutex_unlock(&disp->mutex);

	list_for_each_entry_safe(outp, outt, &atom->outp, head) {
		list_del(&outp->head);
		kfree(outp);
	}

	/* Wait for HW to signal completion. */
	for_each_new_plane_in_state(state, plane, new_plane_state, i) {
		struct nv50_wndw_atom *asyw = nv50_wndw_atom(new_plane_state);
		struct nv50_wndw *wndw = nv50_wndw(plane);
		int ret = nv50_wndw_wait_armed(wndw, asyw);
		if (ret)
			NV_ERROR(drm, "%s: timeout\n", plane->name);
	}

	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
		if (new_crtc_state->event) {
			unsigned long flags;
			/* Get correct count/ts if racing with vblank irq */
			if (new_crtc_state->active)
				drm_crtc_accurate_vblank_count(crtc);
			spin_lock_irqsave(&crtc->dev->event_lock, flags);
			drm_crtc_send_vblank_event(crtc, new_crtc_state->event);
			spin_unlock_irqrestore(&crtc->dev->event_lock, flags);

			new_crtc_state->event = NULL;
			if (new_crtc_state->active)
				drm_crtc_vblank_put(crtc);
		}
	}

	nv50_crc_atomic_start_reporting(state);
	if (!flushed)
		nv50_crc_atomic_release_notifier_contexts(state);

	drm_atomic_helper_commit_hw_done(state);
	drm_atomic_helper_cleanup_planes(dev, state);
	drm_atomic_helper_commit_cleanup_done(state);
	drm_atomic_state_put(state);

	/* Drop the RPM ref we got from nv50_disp_atomic_commit() */
	pm_runtime_mark_last_busy(dev->dev);
	pm_runtime_put_autosuspend(dev->dev);
}

static void
nv50_disp_atomic_commit_work(struct work_struct *work)
{
	struct drm_atomic_state *state =
		container_of(work, typeof(*state), commit_work);
	nv50_disp_atomic_commit_tail(state);
}

static int
nv50_disp_atomic_commit(struct drm_device *dev,
			struct drm_atomic_state *state, bool nonblock)
{
	struct drm_plane_state *new_plane_state;
	struct drm_plane *plane;
	int ret, i;

	ret = pm_runtime_get_sync(dev->dev);
	if (ret < 0 && ret != -EACCES) {
		pm_runtime_put_autosuspend(dev->dev);
		return ret;
	}

	ret = drm_atomic_helper_setup_commit(state, nonblock);
	if (ret)
		goto done;

	INIT_WORK(&state->commit_work, nv50_disp_atomic_commit_work);

	ret = drm_atomic_helper_prepare_planes(dev, state);
	if (ret)
		goto done;

	if (!nonblock) {
		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
		if (ret)
			goto err_cleanup;
	}

	ret = drm_atomic_helper_swap_state(state, true);
	if (ret)
		goto err_cleanup;

	for_each_new_plane_in_state(state, plane, new_plane_state, i) {
		struct nv50_wndw_atom *asyw = nv50_wndw_atom(new_plane_state);
		struct nv50_wndw *wndw = nv50_wndw(plane);

		if (asyw->set.image)
			nv50_wndw_ntfy_enable(wndw, asyw);
	}

	drm_atomic_state_get(state);

	/*
	 * Grab another RPM ref for the commit tail, which will release the
	 * ref when it's finished
	 */
	pm_runtime_get_noresume(dev->dev);

	if (nonblock)
		queue_work(system_unbound_wq, &state->commit_work);
	else
		nv50_disp_atomic_commit_tail(state);

err_cleanup:
	if (ret)
		drm_atomic_helper_unprepare_planes(dev, state);
done:
	pm_runtime_put_autosuspend(dev->dev);
	return ret;
}

static struct nv50_outp_atom *
nv50_disp_outp_atomic_add(struct nv50_atom *atom, struct drm_encoder *encoder)
{
	struct nv50_outp_atom *outp;

	list_for_each_entry(outp, &atom->outp, head) {
		if (outp->encoder == encoder)
			return outp;
	}

	outp = kzalloc(sizeof(*outp), GFP_KERNEL);
	if (!outp)
		return ERR_PTR(-ENOMEM);

	list_add(&outp->head, &atom->outp);
	outp->encoder = encoder;
	return outp;
}

static int
nv50_disp_outp_atomic_check_clr(struct nv50_atom *atom,
				struct drm_connector_state *old_connector_state)
{
	struct drm_encoder *encoder = old_connector_state->best_encoder;
	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
	struct drm_crtc *crtc;
	struct nv50_outp_atom *outp;

	if (!(crtc = old_connector_state->crtc))
		return 0;

	old_crtc_state = drm_atomic_get_old_crtc_state(&atom->state, crtc);
	new_crtc_state = drm_atomic_get_new_crtc_state(&atom->state, crtc);
	if (old_crtc_state->active && drm_atomic_crtc_needs_modeset(new_crtc_state)) {
		outp = nv50_disp_outp_atomic_add(atom, encoder);
		if (IS_ERR(outp))
			return PTR_ERR(outp);

		if (outp->encoder->encoder_type == DRM_MODE_ENCODER_DPMST ||
		    nouveau_encoder(outp->encoder)->dcb->type == DCB_OUTPUT_DP)
			atom->flush_disable = true;
		outp->clr.ctrl = true;
		atom->lock_core = true;
	}

	return 0;
}

static int
nv50_disp_outp_atomic_check_set(struct nv50_atom *atom,
				struct drm_connector_state *connector_state)
{
	struct drm_encoder *encoder = connector_state->best_encoder;
	struct drm_crtc_state *new_crtc_state;
	struct drm_crtc *crtc;
	struct nv50_outp_atom *outp;

	if (!(crtc = connector_state->crtc))
		return 0;

	new_crtc_state = drm_atomic_get_new_crtc_state(&atom->state, crtc);
	if (new_crtc_state->active && drm_atomic_crtc_needs_modeset(new_crtc_state)) {
		outp = nv50_disp_outp_atomic_add(atom, encoder);
		if (IS_ERR(outp))
			return PTR_ERR(outp);

		outp->set.ctrl = true;
		atom->lock_core = true;
	}

	return 0;
}

static int
nv50_disp_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
{
	struct nv50_atom *atom = nv50_atom(state);
	struct nv50_core *core = nv50_disp(dev)->core;
	struct drm_connector_state *old_connector_state, *new_connector_state;
	struct drm_connector *connector;
	struct drm_crtc_state *new_crtc_state;
	struct drm_crtc *crtc;
	struct nv50_head *head;
	struct nv50_head_atom *asyh;
	int ret, i;

	if (core->assign_windows && core->func->head->static_wndw_map) {
		drm_for_each_crtc(crtc, dev) {
			new_crtc_state = drm_atomic_get_crtc_state(state,
								   crtc);
			if (IS_ERR(new_crtc_state))
				return PTR_ERR(new_crtc_state);

			head = nv50_head(crtc);
			asyh = nv50_head_atom(new_crtc_state);
			core->func->head->static_wndw_map(head, asyh);
		}
	}

	/* We need to handle colour management on a per-plane basis. */
	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
		if (new_crtc_state->color_mgmt_changed) {
			ret = drm_atomic_add_affected_planes(state, crtc);
			if (ret)
				return ret;
		}
	}

	ret = drm_atomic_helper_check(dev, state);
	if (ret)
		return ret;

	for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
		ret = nv50_disp_outp_atomic_check_clr(atom, old_connector_state);
		if (ret)
			return ret;

		ret = nv50_disp_outp_atomic_check_set(atom, new_connector_state);
		if (ret)
			return ret;
	}

	ret = drm_dp_mst_atomic_check(state);
	if (ret)
		return ret;

	nv50_crc_atomic_check_outp(atom);

	return 0;
}

static void
nv50_disp_atomic_state_clear(struct drm_atomic_state *state)
{
	struct nv50_atom *atom = nv50_atom(state);
	struct nv50_outp_atom *outp, *outt;

	list_for_each_entry_safe(outp, outt, &atom->outp, head) {
		list_del(&outp->head);
		kfree(outp);
	}

	drm_atomic_state_default_clear(state);
}

static void
nv50_disp_atomic_state_free(struct drm_atomic_state *state)
{
	struct nv50_atom *atom = nv50_atom(state);
	drm_atomic_state_default_release(&atom->state);
	kfree(atom);
}

static struct drm_atomic_state *
nv50_disp_atomic_state_alloc(struct drm_device *dev)
{
	struct nv50_atom *atom;
	if (!(atom = kzalloc(sizeof(*atom), GFP_KERNEL)) ||
	    drm_atomic_state_init(dev, &atom->state) < 0) {
		kfree(atom);
		return NULL;
	}
	INIT_LIST_HEAD(&atom->outp);
	return &atom->state;
}

static const struct drm_mode_config_funcs
nv50_disp_func = {
	.fb_create = nouveau_user_framebuffer_create,
	.output_poll_changed = drm_fb_helper_output_poll_changed,
	.atomic_check = nv50_disp_atomic_check,
	.atomic_commit = nv50_disp_atomic_commit,
	.atomic_state_alloc = nv50_disp_atomic_state_alloc,
	.atomic_state_clear = nv50_disp_atomic_state_clear,
	.atomic_state_free = nv50_disp_atomic_state_free,
};

static const struct drm_mode_config_helper_funcs
nv50_disp_helper_func = {
	.atomic_commit_setup = drm_dp_mst_atomic_setup_commit,
};

/******************************************************************************
 * Init
 *****************************************************************************/

static void
nv50_display_fini(struct drm_device *dev, bool runtime, bool suspend)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct drm_encoder *encoder;

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		if (encoder->encoder_type != DRM_MODE_ENCODER_DPMST)
			nv50_mstm_fini(nouveau_encoder(encoder));
	}

	if (!runtime)
		cancel_work_sync(&drm->hpd_work);
}

static inline void
nv50_display_read_hw_or_state(struct drm_device *dev, struct nv50_disp *disp,
			      struct nouveau_encoder *outp)
{
	struct drm_crtc *crtc;
	struct drm_connector_list_iter conn_iter;
	struct drm_connector *conn;
	struct nv50_head_atom *armh;
	const u32 encoder_mask = drm_encoder_mask(&outp->base.base);
	bool found_conn = false, found_head = false;
	u8 proto;
	int head_idx;
	int ret;

	switch (outp->dcb->type) {
	case DCB_OUTPUT_TMDS:
		ret = nvif_outp_inherit_tmds(&outp->outp, &proto);
		break;
	case DCB_OUTPUT_DP:
		ret = nvif_outp_inherit_dp(&outp->outp, &proto);
		break;
	case DCB_OUTPUT_LVDS:
		ret = nvif_outp_inherit_lvds(&outp->outp, &proto);
		break;
	case DCB_OUTPUT_ANALOG:
		ret = nvif_outp_inherit_rgb_crt(&outp->outp, &proto);
		break;
	default:
		drm_dbg_kms(dev, "Readback for %s not implemented yet, skipping\n",
			    outp->base.base.name);
		drm_WARN_ON(dev, true);
		return;
	}

	if (ret < 0)
		return;

	head_idx = ret;

	drm_for_each_crtc(crtc, dev) {
		if (crtc->index != head_idx)
			continue;

		armh = nv50_head_atom(crtc->state);
		found_head = true;
		break;
	}
	if (drm_WARN_ON(dev, !found_head))
		return;

	/* Figure out which connector is being used by this encoder */
	drm_connector_list_iter_begin(dev, &conn_iter);
	nouveau_for_each_non_mst_connector_iter(conn, &conn_iter) {
		if (nouveau_connector(conn)->index == outp->dcb->connector) {
			found_conn = true;
			break;
		}
	}
	drm_connector_list_iter_end(&conn_iter);
	if (drm_WARN_ON(dev, !found_conn))
		return;

	armh->state.encoder_mask = encoder_mask;
	armh->state.connector_mask = drm_connector_mask(conn);
	armh->state.active = true;
	armh->state.enable = true;
	pm_runtime_get_noresume(dev->dev);

	outp->crtc = crtc;
	outp->ctrl = NVVAL(NV507D, SOR_SET_CONTROL, PROTOCOL, proto) | BIT(crtc->index);

	drm_connector_get(conn);
	conn->state->crtc = crtc;
	conn->state->best_encoder = &outp->base.base;
}

/* Read back the currently programmed display state */
static void
nv50_display_read_hw_state(struct nouveau_drm *drm)
{
	struct drm_device *dev = drm->dev;
	struct drm_encoder *encoder;
	struct drm_modeset_acquire_ctx ctx;
	struct nv50_disp *disp = nv50_disp(dev);
	int ret;

	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);

	drm_for_each_encoder(encoder, dev) {
		if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST)
			continue;

		nv50_display_read_hw_or_state(dev, disp, nouveau_encoder(encoder));
	}

	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
}

static int
nv50_display_init(struct drm_device *dev, bool resume, bool runtime)
{
	struct nv50_core *core = nv50_disp(dev)->core;
	struct drm_encoder *encoder;

	if (resume || runtime)
		core->func->init(core);

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		if (encoder->encoder_type != DRM_MODE_ENCODER_DPMST) {
			struct nouveau_encoder *nv_encoder =
				nouveau_encoder(encoder);
			nv50_mstm_init(nv_encoder, runtime);
		}
	}

	if (!resume)
		nv50_display_read_hw_state(nouveau_drm(dev));

	return 0;
}

static void
nv50_display_destroy(struct drm_device *dev)
{
	struct nv50_disp *disp = nv50_disp(dev);

	nv50_audio_component_fini(nouveau_drm(dev));

	nvif_object_unmap(&disp->caps);
	nvif_object_dtor(&disp->caps);
	nv50_core_del(&disp->core);

	nouveau_bo_unmap(disp->sync);
	if (disp->sync)
		nouveau_bo_unpin(disp->sync);
	nouveau_bo_ref(NULL, &disp->sync);

	nouveau_display(dev)->priv = NULL;
	kfree(disp);
}

int
nv50_display_create(struct drm_device *dev)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct drm_connector *connector, *tmp;
	struct nv50_disp *disp;
	int ret, i;
	bool has_mst = false;

	disp = kzalloc(sizeof(*disp), GFP_KERNEL);
	if (!disp)
		return -ENOMEM;

	mutex_init(&disp->mutex);

	nouveau_display(dev)->priv = disp;
	nouveau_display(dev)->dtor = nv50_display_destroy;
	nouveau_display(dev)->init = nv50_display_init;
	nouveau_display(dev)->fini = nv50_display_fini;
	disp->disp = &nouveau_display(dev)->disp;
	dev->mode_config.funcs = &nv50_disp_func;
	dev->mode_config.helper_private = &nv50_disp_helper_func;
	dev->mode_config.quirk_addfb_prefer_xbgr_30bpp = true;
	dev->mode_config.normalize_zpos = true;

	/* small shared memory area we use for notifiers and semaphores */
	ret = nouveau_bo_new(&drm->client, 4096, 0x1000,
			     NOUVEAU_GEM_DOMAIN_VRAM,
			     0, 0x0000, NULL, NULL, &disp->sync);
	if (!ret) {
		ret = nouveau_bo_pin(disp->sync, NOUVEAU_GEM_DOMAIN_VRAM, true);
		if (!ret) {
			ret = nouveau_bo_map(disp->sync);
			if (ret)
				nouveau_bo_unpin(disp->sync);
		}
		if (ret)
			nouveau_bo_ref(NULL, &disp->sync);
	}

	if (ret)
		goto out;

	/* allocate master evo channel */
	ret = nv50_core_new(drm, &disp->core);
	if (ret)
		goto out;

	disp->core->func->init(disp->core);
	if (disp->core->func->caps_init) {
		ret = disp->core->func->caps_init(drm, disp);
		if (ret)
			goto out;
	}

	/* Assign the correct format modifiers */
	if (disp->disp->object.oclass >= TU102_DISP)
		nouveau_display(dev)->format_modifiers = wndwc57e_modifiers;
	else
	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_FERMI)
		nouveau_display(dev)->format_modifiers = disp90xx_modifiers;
	else
		nouveau_display(dev)->format_modifiers = disp50xx_modifiers;

	/* FIXME: 256x256 cursors are supported on Kepler, however unlike Maxwell and later
	 * generations Kepler requires that we use small pages (4K) for cursor scanout surfaces. The
	 * proper fix for this is to teach nouveau to migrate fbs being used for the cursor plane to
	 * small page allocations in prepare_fb(). When this is implemented, we should also force
	 * large pages (128K) for ovly fbs in order to fix Kepler ovlys.
	 * But until then, just limit cursors to 128x128 - which is small enough to avoid ever using
	 * large pages.
	 */
	if (disp->disp->object.oclass >= GM107_DISP) {
		dev->mode_config.cursor_width = 256;
		dev->mode_config.cursor_height = 256;
	} else if (disp->disp->object.oclass >= GK104_DISP) {
		dev->mode_config.cursor_width = 128;
		dev->mode_config.cursor_height = 128;
	} else {
		dev->mode_config.cursor_width = 64;
		dev->mode_config.cursor_height = 64;
	}

	/* create encoder/connector objects based on VBIOS DCB table */
	for_each_set_bit(i, &disp->disp->outp_mask, sizeof(disp->disp->outp_mask) * 8) {
		struct nouveau_encoder *outp;

		outp = kzalloc(sizeof(*outp), GFP_KERNEL);
		if (!outp)
			break;

		ret = nvif_outp_ctor(disp->disp, "kmsOutp", i, &outp->outp);
		if (ret) {
			kfree(outp);
			continue;
		}

		connector = nouveau_connector_create(dev, outp->outp.info.conn);
		if (IS_ERR(connector)) {
			nvif_outp_dtor(&outp->outp);
			kfree(outp);
			continue;
		}

		outp->base.base.possible_crtcs = outp->outp.info.heads;
		outp->base.base.possible_clones = 0;
		outp->conn = nouveau_connector(connector);

		outp->dcb = kzalloc(sizeof(*outp->dcb), GFP_KERNEL);
		if (!outp->dcb)
			break;

		switch (outp->outp.info.proto) {
		case NVIF_OUTP_RGB_CRT:
			outp->dcb->type = DCB_OUTPUT_ANALOG;
			outp->dcb->crtconf.maxfreq = outp->outp.info.rgb_crt.freq_max;
			break;
		case NVIF_OUTP_TMDS:
			outp->dcb->type = DCB_OUTPUT_TMDS;
			outp->dcb->duallink_possible = outp->outp.info.tmds.dual;
			break;
		case NVIF_OUTP_LVDS:
			outp->dcb->type = DCB_OUTPUT_LVDS;
			outp->dcb->lvdsconf.use_acpi_for_edid = outp->outp.info.lvds.acpi_edid;
			break;
		case NVIF_OUTP_DP:
			outp->dcb->type = DCB_OUTPUT_DP;
			outp->dcb->dpconf.link_nr = outp->outp.info.dp.link_nr;
			outp->dcb->dpconf.link_bw = outp->outp.info.dp.link_bw;
			if (outp->outp.info.dp.mst)
				has_mst = true;
			break;
		default:
			WARN_ON(1);
			continue;
		}

		outp->dcb->heads = outp->outp.info.heads;
		outp->dcb->connector = outp->outp.info.conn;
		outp->dcb->i2c_index = outp->outp.info.ddc;

		switch (outp->outp.info.type) {
		case NVIF_OUTP_DAC : ret = nv50_dac_create(outp); break;
		case NVIF_OUTP_SOR : ret = nv50_sor_create(outp); break;
		case NVIF_OUTP_PIOR: ret = nv50_pior_create(outp); break;
		default:
			WARN_ON(1);
			continue;
		}

		if (ret) {
			NV_WARN(drm, "failed to create encoder %d/%d/%d: %d\n",
				i, outp->outp.info.type, outp->outp.info.proto, ret);
		}
	}

	/* cull any connectors we created that don't have an encoder */
	list_for_each_entry_safe(connector, tmp, &dev->mode_config.connector_list, head) {
		if (connector->possible_encoders)
			continue;

		NV_WARN(drm, "%s has no encoders, removing\n",
			connector->name);
		connector->funcs->destroy(connector);
	}

	/* create crtc objects to represent the hw heads */
	for_each_set_bit(i, &disp->disp->head_mask, sizeof(disp->disp->head_mask) * 8) {
		struct nv50_head *head;

		head = nv50_head_create(dev, i);
		if (IS_ERR(head)) {
			ret = PTR_ERR(head);
			goto out;
		}

		if (has_mst) {
			head->msto = nv50_msto_new(dev, head, i);
			if (IS_ERR(head->msto)) {
				ret = PTR_ERR(head->msto);
				head->msto = NULL;
				goto out;
			}

			/*
			 * FIXME: This is a hack to workaround the following
			 * issues:
			 *
			 * https://gitlab.gnome.org/GNOME/mutter/issues/759
			 * https://gitlab.freedesktop.org/xorg/xserver/merge_requests/277
			 *
			 * Once these issues are closed, this should be
			 * removed
			 */
			head->msto->encoder.possible_crtcs = disp->disp->head_mask;
		}
	}

	/* Disable vblank irqs aggressively for power-saving, safe on nv50+ */
	dev->vblank_disable_immediate = true;

	nv50_audio_component_init(drm);

out:
	if (ret)
		nv50_display_destroy(dev);
	return ret;
}

/******************************************************************************
 * Format modifiers
 *****************************************************************************/

/****************************************************************
 *            Log2(block height) ----------------------------+  *
 *            Page Kind ----------------------------------+  |  *
 *            Gob Height/Page Kind Generation ------+     |  |  *
 *                          Sector layout -------+  |     |  |  *
 *                          Compression ------+  |  |     |  |  */
const u64 disp50xx_modifiers[] = { /*         |  |  |     |  |  */
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x7a, 0),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x7a, 1),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x7a, 2),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x7a, 3),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x7a, 4),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x7a, 5),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x78, 0),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x78, 1),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x78, 2),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x78, 3),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x78, 4),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x78, 5),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x70, 0),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x70, 1),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x70, 2),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x70, 3),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x70, 4),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 1, 0x70, 5),
	DRM_FORMAT_MOD_LINEAR,
	DRM_FORMAT_MOD_INVALID
};

/****************************************************************
 *            Log2(block height) ----------------------------+  *
 *            Page Kind ----------------------------------+  |  *
 *            Gob Height/Page Kind Generation ------+     |  |  *
 *                          Sector layout -------+  |     |  |  *
 *                          Compression ------+  |  |     |  |  */
const u64 disp90xx_modifiers[] = { /*         |  |  |     |  |  */
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 0, 0xfe, 0),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 0, 0xfe, 1),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 0, 0xfe, 2),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 0, 0xfe, 3),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 0, 0xfe, 4),
	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 0, 0xfe, 5),
	DRM_FORMAT_MOD_LINEAR,
	DRM_FORMAT_MOD_INVALID
};