blob: d47442125fa183146135f3725eae161c68e2a900 [file] [log] [blame]
/*
* Copyright (C) 2009 Red Hat <mjg@redhat.com>
*
* 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 (including the
* next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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:
* Matthew Garrett <mjg@redhat.com>
*
* Register locations derived from NVClock by Roderick Colenbrander
*/
#include <linux/apple-gmux.h>
#include <linux/backlight.h>
#include <linux/idr.h>
#include <drm/drm_probe_helper.h>
#include "nouveau_drv.h"
#include "nouveau_reg.h"
#include "nouveau_encoder.h"
#include "nouveau_connector.h"
#include "nouveau_acpi.h"
static struct ida bl_ida;
#define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
static bool
nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],
struct nouveau_backlight *bl)
{
const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL);
if (nb < 0)
return false;
if (nb > 0)
snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
else
snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
bl->id = nb;
return true;
}
static int
nv40_get_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nvif_object *device = &drm->client.device.object;
int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
NV40_PMC_BACKLIGHT_MASK) >> 16;
return val;
}
static int
nv40_set_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nvif_object *device = &drm->client.device.object;
int val = bd->props.brightness;
int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
nvif_wr32(device, NV40_PMC_BACKLIGHT,
(val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
return 0;
}
static const struct backlight_ops nv40_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nv40_get_intensity,
.update_status = nv40_set_intensity,
};
static int
nv40_backlight_init(struct nouveau_encoder *encoder,
struct backlight_properties *props,
const struct backlight_ops **ops)
{
struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev);
struct nvif_object *device = &drm->client.device.object;
if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
return -ENODEV;
props->max_brightness = 31;
*ops = &nv40_bl_ops;
return 0;
}
/*
* eDP brightness callbacks need to happen under lock, since we need to
* enable/disable the backlight ourselves for modesets
*/
static int
nv50_edp_get_brightness(struct backlight_device *bd)
{
struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
struct drm_device *dev = connector->dev;
struct drm_crtc *crtc;
struct drm_modeset_acquire_ctx ctx;
int ret = 0;
drm_modeset_acquire_init(&ctx, 0);
retry:
ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
if (ret == -EDEADLK)
goto deadlock;
else if (ret < 0)
goto out;
crtc = connector->state->crtc;
if (!crtc)
goto out;
ret = drm_modeset_lock(&crtc->mutex, &ctx);
if (ret == -EDEADLK)
goto deadlock;
else if (ret < 0)
goto out;
if (!crtc->state->active)
goto out;
ret = bd->props.brightness;
out:
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return ret;
deadlock:
drm_modeset_backoff(&ctx);
goto retry;
}
static int
nv50_edp_set_brightness(struct backlight_device *bd)
{
struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
struct nouveau_connector *nv_connector = nouveau_connector(connector);
struct drm_device *dev = connector->dev;
struct drm_crtc *crtc;
struct drm_dp_aux *aux = &nv_connector->aux;
struct nouveau_backlight *nv_bl = nv_connector->backlight;
struct drm_modeset_acquire_ctx ctx;
int ret = 0;
drm_modeset_acquire_init(&ctx, 0);
retry:
ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
if (ret == -EDEADLK)
goto deadlock;
else if (ret < 0)
goto out;
crtc = connector->state->crtc;
if (!crtc)
goto out;
ret = drm_modeset_lock(&crtc->mutex, &ctx);
if (ret == -EDEADLK)
goto deadlock;
else if (ret < 0)
goto out;
if (crtc->state->active)
ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness);
out:
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return ret;
deadlock:
drm_modeset_backoff(&ctx);
goto retry;
}
static const struct backlight_ops nv50_edp_bl_ops = {
.get_brightness = nv50_edp_get_brightness,
.update_status = nv50_edp_set_brightness,
};
static int
nv50_get_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
return nvif_outp_bl_get(&nv_encoder->outp);
}
static int
nv50_set_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
return nvif_outp_bl_set(&nv_encoder->outp, backlight_get_brightness(bd));
}
static const struct backlight_ops nv50_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nv50_get_intensity,
.update_status = nv50_set_intensity,
};
/* FIXME: perform backlight probing for eDP _before_ this, this only gets called after connector
* registration which happens after the initial modeset
*/
static int
nv50_backlight_init(struct nouveau_backlight *bl,
struct nouveau_connector *nv_conn,
struct nouveau_encoder *nv_encoder,
struct backlight_properties *props,
const struct backlight_ops **ops)
{
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
/*
* Note when this runs the connectors have not been probed yet,
* so nv_conn->base.status is not set yet.
*/
if (nvif_outp_bl_get(&nv_encoder->outp) < 0 ||
drm_helper_probe_detect(&nv_conn->base, NULL, false) != connector_status_connected)
return -ENODEV;
if (nv_conn->type == DCB_CONNECTOR_eDP) {
int ret;
u16 current_level;
u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
u8 current_mode;
ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd,
EDP_DISPLAY_CTL_CAP_SIZE);
if (ret < 0)
return ret;
/* TODO: Add support for hybrid PWM/DPCD panels */
if (drm_edp_backlight_supported(edp_dpcd) &&
(edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
(edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) {
NV_DEBUG(drm, "DPCD backlight controls supported on %s\n",
nv_conn->base.name);
ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd,
&current_level, &current_mode);
if (ret < 0)
return ret;
ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level);
if (ret < 0) {
NV_ERROR(drm, "Failed to enable backlight on %s: %d\n",
nv_conn->base.name, ret);
return ret;
}
*ops = &nv50_edp_bl_ops;
props->brightness = current_level;
props->max_brightness = bl->edp_info.max;
bl->uses_dpcd = true;
return 0;
}
}
*ops = &nv50_bl_ops;
props->max_brightness = 100;
return 0;
}
int
nouveau_backlight_init(struct drm_connector *connector)
{
struct nouveau_drm *drm = nouveau_drm(connector->dev);
struct nouveau_backlight *bl;
struct nouveau_encoder *nv_encoder = NULL;
struct nvif_device *device = &drm->client.device;
char backlight_name[BL_NAME_SIZE];
struct backlight_properties props = {0};
const struct backlight_ops *ops;
int ret;
if (apple_gmux_present()) {
NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
return 0;
}
if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
else
return 0;
if (!nv_encoder)
return 0;
bl = kzalloc(sizeof(*bl), GFP_KERNEL);
if (!bl)
return -ENOMEM;
switch (device->info.family) {
case NV_DEVICE_INFO_V0_CURIE:
ret = nv40_backlight_init(nv_encoder, &props, &ops);
break;
case NV_DEVICE_INFO_V0_TESLA:
case NV_DEVICE_INFO_V0_FERMI:
case NV_DEVICE_INFO_V0_KEPLER:
case NV_DEVICE_INFO_V0_MAXWELL:
case NV_DEVICE_INFO_V0_PASCAL:
case NV_DEVICE_INFO_V0_VOLTA:
case NV_DEVICE_INFO_V0_TURING:
case NV_DEVICE_INFO_V0_AMPERE: //XXX: not confirmed
ret = nv50_backlight_init(bl, nouveau_connector(connector),
nv_encoder, &props, &ops);
break;
default:
ret = 0;
goto fail_alloc;
}
if (ret) {
if (ret == -ENODEV)
ret = 0;
goto fail_alloc;
}
if (!nouveau_acpi_video_backlight_use_native()) {
NV_INFO(drm, "Skipping nv_backlight registration\n");
goto fail_alloc;
}
if (!nouveau_get_backlight_name(backlight_name, bl)) {
NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
goto fail_alloc;
}
props.type = BACKLIGHT_RAW;
bl->dev = backlight_device_register(backlight_name, connector->kdev,
nv_encoder, ops, &props);
if (IS_ERR(bl->dev)) {
if (bl->id >= 0)
ida_free(&bl_ida, bl->id);
ret = PTR_ERR(bl->dev);
goto fail_alloc;
}
nouveau_connector(connector)->backlight = bl;
if (!bl->dev->props.brightness)
bl->dev->props.brightness =
bl->dev->ops->get_brightness(bl->dev);
backlight_update_status(bl->dev);
return 0;
fail_alloc:
kfree(bl);
/*
* If we get here we have an internal panel, but no nv_backlight,
* try registering an ACPI video backlight device instead.
*/
if (ret == 0)
nouveau_acpi_video_register_backlight();
return ret;
}
void
nouveau_backlight_fini(struct drm_connector *connector)
{
struct nouveau_connector *nv_conn = nouveau_connector(connector);
struct nouveau_backlight *bl = nv_conn->backlight;
if (!bl)
return;
if (bl->id >= 0)
ida_free(&bl_ida, bl->id);
backlight_device_unregister(bl->dev);
nv_conn->backlight = NULL;
kfree(bl);
}
void
nouveau_backlight_ctor(void)
{
ida_init(&bl_ida);
}
void
nouveau_backlight_dtor(void)
{
ida_destroy(&bl_ida);
}