* [Nouveau] [PATCH v5 1/5] drm/i915: Add support for panels with VESA backlights with PWM enable/disable
2021-11-05 18:33 [Nouveau] [PATCH v5 0/5] drm/dp, drm/i915: Finish basic PWM support for VESA backlight helpers Lyude Paul
@ 2021-11-05 18:33 ` Lyude Paul
2021-11-05 18:33 ` [Nouveau] [PATCH v5 2/5] drm/nouveau/kms/nv50-: Explicitly check DPCD backlights for aux enable/brightness Lyude Paul
` (3 subsequent siblings)
4 siblings, 0 replies; 7+ messages in thread
From: Lyude Paul @ 2021-11-05 18:33 UTC (permalink / raw)
To: dri-devel, nouveau, intel-gfx
Cc: Tvrtko Ursulin, David Airlie, Joonas Lahtinen, open list,
Jani Nikula, stable, Daniel Vetter, Rodrigo Vivi,
Ville Syrjälä
This simply adds proper support for panel backlights that can be controlled
via VESA's backlight control protocol, but which also require that we
enable and disable the backlight via PWM instead of via the DPCD interface.
We also enable this by default, in order to fix some people's backlights
that were broken by not having this enabled.
For reference, backlights that require this and use VESA's backlight
interface tend to be laptops with hybrid GPUs, but this very well may
change in the future.
v4:
* Make sure that we call intel_backlight_level_to_pwm() in
intel_dp_aux_vesa_enable_backlight() - vsyrjala
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://gitlab.freedesktop.org/drm/intel/-/issues/3680
Fixes: fe7d52bccab6 ("drm/i915/dp: Don't use DPCD backlights that need PWM enable/disable")
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: <stable@vger.kernel.org> # v5.12+
---
.../drm/i915/display/intel_dp_aux_backlight.c | 27 ++++++++++++++-----
1 file changed, 21 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index 569d17b4d00f..f05b71c01b8e 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -293,6 +293,13 @@ intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
struct intel_panel *panel = &connector->panel;
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
+ if (!panel->backlight.edp.vesa.info.aux_enable) {
+ u32 pwm_level = intel_backlight_invert_pwm_level(connector,
+ panel->backlight.pwm_level_max);
+
+ panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);
+ }
+
drm_edp_backlight_enable(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);
}
@@ -304,6 +311,10 @@ static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info);
+
+ if (!panel->backlight.edp.vesa.info.aux_enable)
+ panel->backlight.pwm_funcs->disable(old_conn_state,
+ intel_backlight_invert_pwm_level(connector, 0));
}
static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, enum pipe pipe)
@@ -321,6 +332,15 @@ static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector,
if (ret < 0)
return ret;
+ if (!panel->backlight.edp.vesa.info.aux_enable) {
+ ret = panel->backlight.pwm_funcs->setup(connector, pipe);
+ if (ret < 0) {
+ drm_err(&i915->drm,
+ "Failed to setup PWM backlight controls for eDP backlight: %d\n",
+ ret);
+ return ret;
+ }
+ }
panel->backlight.max = panel->backlight.edp.vesa.info.max;
panel->backlight.min = 0;
if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
@@ -340,12 +360,7 @@ intel_dp_aux_supports_vesa_backlight(struct intel_connector *connector)
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct drm_i915_private *i915 = dp_to_i915(intel_dp);
- /* TODO: We currently only support AUX only backlight configurations, not backlights which
- * require a mix of PWM and AUX controls to work. In the mean time, these machines typically
- * work just fine using normal PWM controls anyway.
- */
- if ((intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
- drm_edp_backlight_supported(intel_dp->edp_dpcd)) {
+ if (drm_edp_backlight_supported(intel_dp->edp_dpcd)) {
drm_dbg_kms(&i915->drm, "AUX Backlight Control Supported!\n");
return true;
}
--
2.31.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [Nouveau] [PATCH v5 3/5] drm/dp: Don't read back backlight mode in drm_edp_backlight_enable()
2021-11-05 18:33 [Nouveau] [PATCH v5 0/5] drm/dp, drm/i915: Finish basic PWM support for VESA backlight helpers Lyude Paul
2021-11-05 18:33 ` [Nouveau] [PATCH v5 1/5] drm/i915: Add support for panels with VESA backlights with PWM enable/disable Lyude Paul
2021-11-05 18:33 ` [Nouveau] [PATCH v5 2/5] drm/nouveau/kms/nv50-: Explicitly check DPCD backlights for aux enable/brightness Lyude Paul
@ 2021-11-05 18:33 ` Lyude Paul
2021-11-05 20:25 ` Doug Anderson
2021-11-05 18:33 ` [Nouveau] [PATCH v5 4/5] drm/dp, drm/i915: Add support for VESA backlights using PWM for brightness control Lyude Paul
2021-11-05 18:33 ` [Nouveau] [PATCH v5 5/5] drm/i915: Clarify probing order in intel_dp_aux_init_backlight_funcs() Lyude Paul
4 siblings, 1 reply; 7+ messages in thread
From: Lyude Paul @ 2021-11-05 18:33 UTC (permalink / raw)
To: dri-devel, nouveau, intel-gfx
Cc: David Airlie, Maarten Lankhorst, open list, Maxime Ripard,
Daniel Vetter, Rodrigo Vivi
As it turns out, apparently some machines will actually leave additional
backlight functionality like dynamic backlight control on before the OS
loads. Currently we don't take care to disable unsupported features when
writing back the backlight mode, which can lead to some rather strange
looking behavior when adjusting the backlight.
So, let's fix this by just not reading back the current backlight mode on
initial enable. I don't think there should really be any downsides to this,
and this will ensure we don't leave any unsupported functionality enabled.
This should fix at least one (but not all) of the issues seen with DPCD
backlight support on fi-bdw-samus
v5:
* Just avoid reading back DPCD register - Doug Anderson
Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: 867cf9cd73c3 ("drm/dp: Extract i915's eDP backlight code into DRM helpers")
---
drivers/gpu/drm/drm_dp_helper.c | 40 ++++++++++-----------------------
1 file changed, 12 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index ada0a1ff262d..af2aad2f4725 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -3363,27 +3363,13 @@ int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backli
const u16 level)
{
int ret;
- u8 dpcd_buf, new_dpcd_buf;
+ u8 dpcd_buf = DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
- ret = drm_dp_dpcd_readb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &dpcd_buf);
- if (ret != 1) {
- drm_dbg_kms(aux->drm_dev,
- "%s: Failed to read backlight mode: %d\n", aux->name, ret);
- return ret < 0 ? ret : -EIO;
- }
-
- new_dpcd_buf = dpcd_buf;
-
- if ((dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK) != DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
- new_dpcd_buf &= ~DP_EDP_BACKLIGHT_CONTROL_MODE_MASK;
- new_dpcd_buf |= DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
-
- if (bl->pwmgen_bit_count) {
- ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, bl->pwmgen_bit_count);
- if (ret != 1)
- drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux pwmgen bit count: %d\n",
- aux->name, ret);
- }
+ if (bl->pwmgen_bit_count) {
+ ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, bl->pwmgen_bit_count);
+ if (ret != 1)
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux pwmgen bit count: %d\n",
+ aux->name, ret);
}
if (bl->pwm_freq_pre_divider) {
@@ -3393,16 +3379,14 @@ int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backli
"%s: Failed to write aux backlight frequency: %d\n",
aux->name, ret);
else
- new_dpcd_buf |= DP_EDP_BACKLIGHT_FREQ_AUX_SET_ENABLE;
+ dpcd_buf |= DP_EDP_BACKLIGHT_FREQ_AUX_SET_ENABLE;
}
- if (new_dpcd_buf != dpcd_buf) {
- ret = drm_dp_dpcd_writeb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, new_dpcd_buf);
- if (ret != 1) {
- drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux backlight mode: %d\n",
- aux->name, ret);
- return ret < 0 ? ret : -EIO;
- }
+ ret = drm_dp_dpcd_writeb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, dpcd_buf);
+ if (ret != 1) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux backlight mode: %d\n",
+ aux->name, ret);
+ return ret < 0 ? ret : -EIO;
}
ret = drm_edp_backlight_set_level(aux, bl, level);
--
2.31.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [Nouveau] [PATCH v5 4/5] drm/dp, drm/i915: Add support for VESA backlights using PWM for brightness control
2021-11-05 18:33 [Nouveau] [PATCH v5 0/5] drm/dp, drm/i915: Finish basic PWM support for VESA backlight helpers Lyude Paul
` (2 preceding siblings ...)
2021-11-05 18:33 ` [Nouveau] [PATCH v5 3/5] drm/dp: Don't read back backlight mode in drm_edp_backlight_enable() Lyude Paul
@ 2021-11-05 18:33 ` Lyude Paul
2021-11-05 18:33 ` [Nouveau] [PATCH v5 5/5] drm/i915: Clarify probing order in intel_dp_aux_init_backlight_funcs() Lyude Paul
4 siblings, 0 replies; 7+ messages in thread
From: Lyude Paul @ 2021-11-05 18:33 UTC (permalink / raw)
To: dri-devel, nouveau, intel-gfx
Cc: Tvrtko Ursulin, Daniel Vetter, Rajeev Nandan, David Airlie,
Joonas Lahtinen, Maarten Lankhorst, Doug Anderson, Maxime Ripard,
open list, Jani Nikula, Rodrigo Vivi, Satadru Pramanik,
Ville Syrjälä
Now that we've added support to i915 for controlling panel backlights that
need PWM to be enabled/disabled, let's finalize this and add support for
controlling brightness levels via PWM as well. This should hopefully put us
towards the path of supporting _ALL_ backlights via VESA's DPCD interface
which would allow us to finally start trusting the DPCD again.
Note however that we still don't enable using this by default on i915 when
it's not needed, primarily because I haven't yet had a chance to confirm if
it's safe to do this on the one machine in Intel's CI that had an issue
with this: samus-fi-bdw. I have done basic testing of this on other
machines though, by manually patching i915 to force it into PWM-only mode
on some of my laptops.
v2:
* Correct documentation (thanks Doug!)
* Get rid of backlight caps
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Cc: Rajeev Nandan <rajeevny@codeaurora.org>
Cc: Satadru Pramanik <satadru@gmail.com>
---
drivers/gpu/drm/drm_dp_helper.c | 72 +++++++++++++------
.../drm/i915/display/intel_dp_aux_backlight.c | 44 +++++++++---
include/drm/drm_dp_helper.h | 7 +-
3 files changed, 89 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index af2aad2f4725..23f9073bc473 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -3290,6 +3290,10 @@ int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_bac
int ret;
u8 buf[2] = { 0 };
+ /* The panel uses the PWM for controlling brightness levels */
+ if (!bl->aux_set)
+ return 0;
+
if (bl->lsb_reg_used) {
buf[0] = (level & 0xff00) >> 8;
buf[1] = (level & 0x00ff);
@@ -3316,7 +3320,7 @@ drm_edp_backlight_set_enable(struct drm_dp_aux *aux, const struct drm_edp_backli
int ret;
u8 buf;
- /* The panel uses something other then DPCD for enabling its backlight */
+ /* This panel uses the EDP_BL_PWR GPIO for enablement */
if (!bl->aux_enable)
return 0;
@@ -3351,11 +3355,11 @@ drm_edp_backlight_set_enable(struct drm_dp_aux *aux, const struct drm_edp_backli
* restoring any important backlight state such as the given backlight level, the brightness byte
* count, backlight frequency, etc.
*
- * Note that certain panels, while supporting brightness level controls over DPCD, may not support
- * having their backlights enabled via the standard %DP_EDP_DISPLAY_CONTROL_REGISTER. On such panels
- * &drm_edp_backlight_info.aux_enable will be set to %false, this function will skip the step of
- * programming the %DP_EDP_DISPLAY_CONTROL_REGISTER, and the driver must perform the required
- * implementation specific step for enabling the backlight after calling this function.
+ * Note that certain panels do not support being enabled or disabled via DPCD, but instead require
+ * that the driver handle enabling/disabling the panel through implementation-specific means using
+ * the EDP_BL_PWR GPIO. For such panels, &drm_edp_backlight_info.aux_enable will be set to %false,
+ * this function becomes a no-op, and the driver is expected to handle powering the panel on using
+ * the EDP_BL_PWR GPIO.
*
* Returns: %0 on success, negative error code on failure.
*/
@@ -3363,7 +3367,12 @@ int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backli
const u16 level)
{
int ret;
- u8 dpcd_buf = DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
+ u8 dpcd_buf;
+
+ if (bl->aux_set)
+ dpcd_buf = DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
+ else
+ dpcd_buf = DP_EDP_BACKLIGHT_CONTROL_MODE_PWM;
if (bl->pwmgen_bit_count) {
ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, bl->pwmgen_bit_count);
@@ -3405,12 +3414,13 @@ EXPORT_SYMBOL(drm_edp_backlight_enable);
* @aux: The DP AUX channel to use
* @bl: Backlight capability info from drm_edp_backlight_init()
*
- * This function handles disabling DPCD backlight controls on a panel over AUX. Note that some
- * panels have backlights that are enabled/disabled by other means, despite having their brightness
- * values controlled through DPCD. On such panels &drm_edp_backlight_info.aux_enable will be set to
- * %false, this function will become a no-op (and we will skip updating
- * %DP_EDP_DISPLAY_CONTROL_REGISTER), and the driver must take care to perform it's own
- * implementation specific step for disabling the backlight.
+ * This function handles disabling DPCD backlight controls on a panel over AUX.
+ *
+ * Note that certain panels do not support being enabled or disabled via DPCD, but instead require
+ * that the driver handle enabling/disabling the panel through implementation-specific means using
+ * the EDP_BL_PWR GPIO. For such panels, &drm_edp_backlight_info.aux_enable will be set to %false,
+ * this function becomes a no-op, and the driver is expected to handle powering the panel off using
+ * the EDP_BL_PWR GPIO.
*
* Returns: %0 on success or no-op, negative error code on failure.
*/
@@ -3434,6 +3444,9 @@ drm_edp_backlight_probe_max(struct drm_dp_aux *aux, struct drm_edp_backlight_inf
int ret;
u8 pn, pn_min, pn_max;
+ if (!bl->aux_set)
+ return 0;
+
ret = drm_dp_dpcd_readb(aux, DP_EDP_PWMGEN_BIT_COUNT, &pn);
if (ret != 1) {
drm_dbg_kms(aux->drm_dev, "%s: Failed to read pwmgen bit count cap: %d\n",
@@ -3519,7 +3532,7 @@ drm_edp_backlight_probe_max(struct drm_dp_aux *aux, struct drm_edp_backlight_inf
}
static inline int
-drm_edp_backlight_probe_level(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,
+drm_edp_backlight_probe_state(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,
u8 *current_mode)
{
int ret;
@@ -3534,6 +3547,9 @@ drm_edp_backlight_probe_level(struct drm_dp_aux *aux, struct drm_edp_backlight_i
}
*current_mode = (mode_reg & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK);
+ if (!bl->aux_set)
+ return 0;
+
if (*current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
int size = 1 + bl->lsb_reg_used;
@@ -3564,7 +3580,7 @@ drm_edp_backlight_probe_level(struct drm_dp_aux *aux, struct drm_edp_backlight_i
* @bl: The &drm_edp_backlight_info struct to fill out with information on the backlight
* @driver_pwm_freq_hz: Optional PWM frequency from the driver in hz
* @edp_dpcd: A cached copy of the eDP DPCD
- * @current_level: Where to store the probed brightness level
+ * @current_level: Where to store the probed brightness level, if any
* @current_mode: Where to store the currently set backlight control mode
*
* Initializes a &drm_edp_backlight_info struct by probing @aux for it's backlight capabilities,
@@ -3584,24 +3600,38 @@ drm_edp_backlight_init(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl
if (edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP)
bl->aux_enable = true;
+ if (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)
+ bl->aux_set = true;
if (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
bl->lsb_reg_used = true;
+ /* Sanity check caps */
+ if (!bl->aux_set && !(edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP)) {
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Panel supports neither AUX or PWM brightness control? Aborting\n",
+ aux->name);
+ return -EINVAL;
+ }
+
ret = drm_edp_backlight_probe_max(aux, bl, driver_pwm_freq_hz, edp_dpcd);
if (ret < 0)
return ret;
- ret = drm_edp_backlight_probe_level(aux, bl, current_mode);
+ ret = drm_edp_backlight_probe_state(aux, bl, current_mode);
if (ret < 0)
return ret;
*current_level = ret;
drm_dbg_kms(aux->drm_dev,
- "%s: Found backlight level=%d/%d pwm_freq_pre_divider=%d mode=%x\n",
- aux->name, *current_level, bl->max, bl->pwm_freq_pre_divider, *current_mode);
- drm_dbg_kms(aux->drm_dev,
- "%s: Backlight caps: pwmgen_bit_count=%d lsb_reg_used=%d aux_enable=%d\n",
- aux->name, bl->pwmgen_bit_count, bl->lsb_reg_used, bl->aux_enable);
+ "%s: Found backlight: aux_set=%d aux_enable=%d mode=%d\n",
+ aux->name, bl->aux_set, bl->aux_enable, *current_mode);
+ if (bl->aux_set) {
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Backlight caps: level=%d/%d pwm_freq_pre_divider=%d lsb_reg_used=%d\n",
+ aux->name, *current_level, bl->max, bl->pwm_freq_pre_divider,
+ bl->lsb_reg_used);
+ }
+
return 0;
}
EXPORT_SYMBOL(drm_edp_backlight_init);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index f05b71c01b8e..96fe3eaba44a 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -282,6 +282,12 @@ intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u3
struct intel_panel *panel = &connector->panel;
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
+ if (!panel->backlight.edp.vesa.info.aux_set) {
+ const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
+
+ intel_backlight_set_pwm_level(conn_state, pwm_level);
+ }
+
drm_edp_backlight_set_level(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);
}
@@ -294,8 +300,13 @@ intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
if (!panel->backlight.edp.vesa.info.aux_enable) {
- u32 pwm_level = intel_backlight_invert_pwm_level(connector,
- panel->backlight.pwm_level_max);
+ u32 pwm_level;
+
+ if (!panel->backlight.edp.vesa.info.aux_set)
+ pwm_level = intel_backlight_level_to_pwm(connector, level);
+ else
+ pwm_level = intel_backlight_invert_pwm_level(connector,
+ panel->backlight.pwm_level_max);
panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);
}
@@ -332,7 +343,7 @@ static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector,
if (ret < 0)
return ret;
- if (!panel->backlight.edp.vesa.info.aux_enable) {
+ if (!panel->backlight.edp.vesa.info.aux_set || !panel->backlight.edp.vesa.info.aux_enable) {
ret = panel->backlight.pwm_funcs->setup(connector, pipe);
if (ret < 0) {
drm_err(&i915->drm,
@@ -341,14 +352,27 @@ static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector,
return ret;
}
}
- panel->backlight.max = panel->backlight.edp.vesa.info.max;
- panel->backlight.min = 0;
- if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
- panel->backlight.level = current_level;
- panel->backlight.enabled = panel->backlight.level != 0;
+
+ if (panel->backlight.edp.vesa.info.aux_set) {
+ panel->backlight.max = panel->backlight.edp.vesa.info.max;
+ panel->backlight.min = 0;
+ if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
+ panel->backlight.level = current_level;
+ panel->backlight.enabled = panel->backlight.level != 0;
+ } else {
+ panel->backlight.level = panel->backlight.max;
+ panel->backlight.enabled = false;
+ }
} else {
- panel->backlight.level = panel->backlight.max;
- panel->backlight.enabled = false;
+ panel->backlight.max = panel->backlight.pwm_level_max;
+ panel->backlight.min = panel->backlight.pwm_level_min;
+ if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {
+ panel->backlight.level = panel->backlight.pwm_funcs->get(connector, pipe);
+ panel->backlight.enabled = panel->backlight.pwm_enabled;
+ } else {
+ panel->backlight.level = panel->backlight.max;
+ panel->backlight.enabled = false;
+ }
}
return 0;
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index afdf7f4183f9..8b2ed4199284 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1868,7 +1868,7 @@ drm_dp_sink_can_do_video_without_timing_msa(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
*
* Note that currently this function will return %false for panels which support various DPCD
* backlight features but which require the brightness be set through PWM, and don't support setting
- * the brightness level via the DPCD. This is a TODO.
+ * the brightness level via the DPCD.
*
* Returns: %True if @edp_dpcd indicates that VESA backlight controls are supported, %false
* otherwise
@@ -1876,8 +1876,7 @@ drm_dp_sink_can_do_video_without_timing_msa(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
static inline bool
drm_edp_backlight_supported(const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE])
{
- return (edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP) &&
- (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP);
+ return !!(edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP);
}
/*
@@ -2238,6 +2237,7 @@ drm_dp_has_quirk(const struct drm_dp_desc *desc, enum drm_dp_quirk quirk)
* @max: The maximum backlight level that may be set
* @lsb_reg_used: Do we also write values to the DP_EDP_BACKLIGHT_BRIGHTNESS_LSB register?
* @aux_enable: Does the panel support the AUX enable cap?
+ * @aux_set: Does the panel support setting the brightness through AUX?
*
* This structure contains various data about an eDP backlight, which can be populated by using
* drm_edp_backlight_init().
@@ -2249,6 +2249,7 @@ struct drm_edp_backlight_info {
bool lsb_reg_used : 1;
bool aux_enable : 1;
+ bool aux_set : 1;
};
int
--
2.31.1
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