blob: 724d40ddd4528d178ab8975c39b0b198081588fa [file] [log] [blame]
/*
* Copyright 2009 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 <drm/dp/drm_dp_helper.h>
#include "nouveau_drv.h"
#include "nouveau_connector.h"
#include "nouveau_encoder.h"
#include "nouveau_crtc.h"
#include <nvif/class.h>
#include <nvif/cl5070.h>
MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
static int nouveau_mst = 1;
module_param_named(mst, nouveau_mst, int, 0400);
static bool
nouveau_dp_has_sink_count(struct drm_connector *connector,
struct nouveau_encoder *outp)
{
return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc);
}
static enum drm_connector_status
nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
struct nouveau_encoder *outp)
{
struct drm_connector *connector = &nv_connector->base;
struct drm_dp_aux *aux = &nv_connector->aux;
struct nv50_mstm *mstm = NULL;
enum drm_connector_status status = connector_status_disconnected;
int ret;
u8 *dpcd = outp->dp.dpcd;
ret = drm_dp_read_dpcd_caps(aux, dpcd);
if (ret < 0)
goto out;
ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd));
if (ret < 0)
goto out;
if (nouveau_mst) {
mstm = outp->dp.mstm;
if (mstm)
mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd);
}
if (nouveau_dp_has_sink_count(connector, outp)) {
ret = drm_dp_read_sink_count(aux);
if (ret < 0)
goto out;
outp->dp.sink_count = ret;
/*
* Dongle connected, but no display. Don't bother reading
* downstream port info
*/
if (!outp->dp.sink_count)
return connector_status_disconnected;
}
ret = drm_dp_read_downstream_info(aux, dpcd,
outp->dp.downstream_ports);
if (ret < 0)
goto out;
status = connector_status_connected;
out:
if (status != connector_status_connected) {
/* Clear any cached info */
outp->dp.sink_count = 0;
}
return status;
}
int
nouveau_dp_detect(struct nouveau_connector *nv_connector,
struct nouveau_encoder *nv_encoder)
{
struct drm_device *dev = nv_encoder->base.base.dev;
struct nouveau_drm *drm = nouveau_drm(dev);
struct drm_connector *connector = &nv_connector->base;
struct nv50_mstm *mstm = nv_encoder->dp.mstm;
enum drm_connector_status status;
u8 *dpcd = nv_encoder->dp.dpcd;
int ret = NOUVEAU_DP_NONE;
/* If we've already read the DPCD on an eDP device, we don't need to
* reread it as it won't change
*/
if (connector->connector_type == DRM_MODE_CONNECTOR_eDP &&
dpcd[DP_DPCD_REV] != 0)
return NOUVEAU_DP_SST;
mutex_lock(&nv_encoder->dp.hpd_irq_lock);
if (mstm) {
/* If we're not ready to handle MST state changes yet, just
* report the last status of the connector. We'll reprobe it
* once we've resumed.
*/
if (mstm->suspended) {
if (mstm->is_mst)
ret = NOUVEAU_DP_MST;
else if (connector->status ==
connector_status_connected)
ret = NOUVEAU_DP_SST;
goto out;
}
}
status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder);
if (status == connector_status_disconnected)
goto out;
/* If we're in MST mode, we're done here */
if (mstm && mstm->can_mst && mstm->is_mst) {
ret = NOUVEAU_DP_MST;
goto out;
}
nv_encoder->dp.link_bw = 27000 * dpcd[DP_MAX_LINK_RATE];
nv_encoder->dp.link_nr =
dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) {
struct drm_dp_aux *aux = &nv_connector->aux;
int ret, i;
u8 sink_rates[16];
ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, sink_rates, sizeof(sink_rates));
if (ret == sizeof(sink_rates)) {
for (i = 0; i < ARRAY_SIZE(sink_rates); i += 2) {
int val = ((sink_rates[i + 1] << 8) | sink_rates[i]) * 200 / 10;
if (val && (i == 0 || val > nv_encoder->dp.link_bw))
nv_encoder->dp.link_bw = val;
}
}
}
NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
nv_encoder->dp.link_nr, nv_encoder->dp.link_bw,
dpcd[DP_DPCD_REV]);
NV_DEBUG(drm, "encoder: %dx%d\n",
nv_encoder->dcb->dpconf.link_nr,
nv_encoder->dcb->dpconf.link_bw);
if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr)
nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw)
nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw;
NV_DEBUG(drm, "maximum: %dx%d\n",
nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
if (mstm && mstm->can_mst) {
ret = nv50_mstm_detect(nv_encoder);
if (ret == 1) {
ret = NOUVEAU_DP_MST;
goto out;
} else if (ret != 0) {
goto out;
}
}
ret = NOUVEAU_DP_SST;
out:
if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST)
nv50_mstm_remove(mstm);
mutex_unlock(&nv_encoder->dp.hpd_irq_lock);
return ret;
}
void nouveau_dp_irq(struct nouveau_drm *drm,
struct nouveau_connector *nv_connector)
{
struct drm_connector *connector = &nv_connector->base;
struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
struct nv50_mstm *mstm;
int ret;
bool send_hpd = false;
if (!outp)
return;
mstm = outp->dp.mstm;
NV_DEBUG(drm, "service %s\n", connector->name);
mutex_lock(&outp->dp.hpd_irq_lock);
if (mstm && mstm->is_mst) {
if (!nv50_mstm_service(drm, nv_connector, mstm))
send_hpd = true;
} else {
drm_dp_cec_irq(&nv_connector->aux);
if (nouveau_dp_has_sink_count(connector, outp)) {
ret = drm_dp_read_sink_count(&nv_connector->aux);
if (ret != outp->dp.sink_count)
send_hpd = true;
if (ret >= 0)
outp->dp.sink_count = ret;
}
}
mutex_unlock(&outp->dp.hpd_irq_lock);
if (send_hpd)
nouveau_connector_hpd(connector);
}
/* TODO:
* - Use the minimum possible BPC here, once we add support for the max bpc
* property.
* - Validate against the DP caps advertised by the GPU (we don't check these
* yet)
*/
enum drm_mode_status
nv50_dp_mode_valid(struct drm_connector *connector,
struct nouveau_encoder *outp,
const struct drm_display_mode *mode,
unsigned *out_clock)
{
const unsigned int min_clock = 25000;
unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock;
const u8 bpp = connector->display_info.bpc * 3;
if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace)
return MODE_NO_INTERLACE;
if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
clock *= 2;
max_rate = outp->dp.link_nr * outp->dp.link_bw;
mode_rate = DIV_ROUND_UP(clock * bpp, 8);
if (mode_rate > max_rate)
return MODE_CLOCK_HIGH;
ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports);
if (ds_max_dotclock && clock > ds_max_dotclock)
return MODE_CLOCK_HIGH;
if (clock < min_clock)
return MODE_CLOCK_LOW;
if (out_clock)
*out_clock = clock;
return MODE_OK;
}