[PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Kai-Heng Feng]

HP DreamColor panel needs to be controlled via AUX interface. However,
it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
intel_dp_aux_display_control_capable() test.

Skip the test if the panel has force DPCD quirk.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
 	struct intel_panel *panel = &intel_connector->panel;
 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	bool force_dpcd;
+
+	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
+				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
 
 	if (i915->params.enable_dpcd_backlight == 0 ||
-	    !intel_dp_aux_display_control_capable(intel_connector))
+	    (!force_dpcd && !intel_dp_aux_display_control_capable(intel_connector)))
 		return -ENODEV;
 
 	/*
@@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
 	 */
 	if (i915->vbt.backlight.type !=
 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
-	    i915->params.enable_dpcd_backlight != 1 &&
-	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
-			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
+	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
 		drm_info(&i915->drm,
 			 "Panel advertises DPCD backlight support, but "
 			 "VBT disagrees. If your backlight controls "
-- 
2.17.1

[PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Kai-Heng Feng]

HP DreamColor panel needs to be controlled via AUX interface. However,
it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
intel_dp_aux_display_control_capable() test.

Skip the test if the panel has force DPCD quirk.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
 	struct intel_panel *panel = &intel_connector->panel;
 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	bool force_dpcd;
+
+	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
+				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
 
 	if (i915->params.enable_dpcd_backlight == 0 ||
-	    !intel_dp_aux_display_control_capable(intel_connector))
+	    (!force_dpcd && !intel_dp_aux_display_control_capable(intel_connector)))
 		return -ENODEV;
 
 	/*
@@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
 	 */
 	if (i915->vbt.backlight.type !=
 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
-	    i915->params.enable_dpcd_backlight != 1 &&
-	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
-			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
+	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
 		drm_info(&i915->drm,
 			 "Panel advertises DPCD backlight support, but "
 			 "VBT disagrees. If your backlight controls "
-- 
2.17.1

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[Intel-gfx] [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Kai-Heng Feng]

HP DreamColor panel needs to be controlled via AUX interface. However,
it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
intel_dp_aux_display_control_capable() test.

Skip the test if the panel has force DPCD quirk.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
 	struct intel_panel *panel = &intel_connector->panel;
 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	bool force_dpcd;
+
+	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
+				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
 
 	if (i915->params.enable_dpcd_backlight == 0 ||
-	    !intel_dp_aux_display_control_capable(intel_connector))
+	    (!force_dpcd && !intel_dp_aux_display_control_capable(intel_connector)))
 		return -ENODEV;
 
 	/*
@@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
 	 */
 	if (i915->vbt.backlight.type !=
 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
-	    i915->params.enable_dpcd_backlight != 1 &&
-	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
-			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
+	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
 		drm_info(&i915->drm,
 			 "Panel advertises DPCD backlight support, but "
 			 "VBT disagrees. If your backlight controls "
-- 
2.17.1

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[PATCH 2/2] drm/dp: HP DreamColor panel brigntness fix

[Kai-Heng Feng]

HP DreamColor panel, which is used by new HP ZBook Studio, needs to use
DPCD to control brightness.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 092c8c985911..b3d0ea1b082b 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1321,6 +1321,7 @@ static const struct edid_quirk edid_quirk_list[] = {
 	 */
 	{ MFG(0x06, 0xaf), PROD_ID(0x9b, 0x32), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x06, 0xaf), PROD_ID(0xeb, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
+	{ MFG(0x30, 0xe4), PROD_ID(0x61, 0x06), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x4d, 0x10), PROD_ID(0xc7, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x4d, 0x10), PROD_ID(0xe6, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x4c, 0x83), PROD_ID(0x47, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
-- 
2.17.1

[PATCH 2/2] drm/dp: HP DreamColor panel brigntness fix

[Kai-Heng Feng]

HP DreamColor panel, which is used by new HP ZBook Studio, needs to use
DPCD to control brightness.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 092c8c985911..b3d0ea1b082b 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1321,6 +1321,7 @@ static const struct edid_quirk edid_quirk_list[] = {
 	 */
 	{ MFG(0x06, 0xaf), PROD_ID(0x9b, 0x32), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x06, 0xaf), PROD_ID(0xeb, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
+	{ MFG(0x30, 0xe4), PROD_ID(0x61, 0x06), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x4d, 0x10), PROD_ID(0xc7, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x4d, 0x10), PROD_ID(0xe6, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x4c, 0x83), PROD_ID(0x47, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
-- 
2.17.1

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Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

Hi! I thought this patch rang a bell, we actually already had some discussion
about this since there's a couple of other systems this was causing issues for.
Unfortunately it never seems like that patch got sent out. Satadru?

(if I don't hear back from them soon, I'll just send out a patch for this
myself)

JFYI - the proper fix here is to just drop the
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As long as
the backlight supports AUX_SET_CAP, that should be enough for us to control it.


On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> HP DreamColor panel needs to be controlled via AUX interface. However,
> it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> intel_dp_aux_display_control_capable() test.
> 
> Skip the test if the panel has force DPCD quirk.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> intel_connector *intel_connector)
>  	struct intel_panel *panel = &intel_connector->panel;
>  	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
>  	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> +	bool force_dpcd;
> +
> +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
>  
>  	if (i915->params.enable_dpcd_backlight == 0 ||
> -	    !intel_dp_aux_display_control_capable(intel_connector))
> +	    (!force_dpcd &&
> !intel_dp_aux_display_control_capable(intel_connector)))
>  		return -ENODEV;
>  
>  	/*
> @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> intel_connector *intel_connector)
>  	 */
>  	if (i915->vbt.backlight.type !=
>  	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> -	    i915->params.enable_dpcd_backlight != 1 &&
> -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
>  		drm_info(&i915->drm,
>  			 "Panel advertises DPCD backlight support, but "
>  			 "VBT disagrees. If your backlight controls "
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

Hi! I thought this patch rang a bell, we actually already had some discussion
about this since there's a couple of other systems this was causing issues for.
Unfortunately it never seems like that patch got sent out. Satadru?

(if I don't hear back from them soon, I'll just send out a patch for this
myself)

JFYI - the proper fix here is to just drop the
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As long as
the backlight supports AUX_SET_CAP, that should be enough for us to control it.


On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> HP DreamColor panel needs to be controlled via AUX interface. However,
> it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> intel_dp_aux_display_control_capable() test.
> 
> Skip the test if the panel has force DPCD quirk.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> intel_connector *intel_connector)
>  	struct intel_panel *panel = &intel_connector->panel;
>  	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
>  	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> +	bool force_dpcd;
> +
> +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
>  
>  	if (i915->params.enable_dpcd_backlight == 0 ||
> -	    !intel_dp_aux_display_control_capable(intel_connector))
> +	    (!force_dpcd &&
> !intel_dp_aux_display_control_capable(intel_connector)))
>  		return -ENODEV;
>  
>  	/*
> @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> intel_connector *intel_connector)
>  	 */
>  	if (i915->vbt.backlight.type !=
>  	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> -	    i915->params.enable_dpcd_backlight != 1 &&
> -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
>  		drm_info(&i915->drm,
>  			 "Panel advertises DPCD backlight support, but "
>  			 "VBT disagrees. If your backlight controls "
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

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Re: [Intel-gfx] [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

Hi! I thought this patch rang a bell, we actually already had some discussion
about this since there's a couple of other systems this was causing issues for.
Unfortunately it never seems like that patch got sent out. Satadru?

(if I don't hear back from them soon, I'll just send out a patch for this
myself)

JFYI - the proper fix here is to just drop the
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As long as
the backlight supports AUX_SET_CAP, that should be enough for us to control it.


On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> HP DreamColor panel needs to be controlled via AUX interface. However,
> it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> intel_dp_aux_display_control_capable() test.
> 
> Skip the test if the panel has force DPCD quirk.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> intel_connector *intel_connector)
>  	struct intel_panel *panel = &intel_connector->panel;
>  	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
>  	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> +	bool force_dpcd;
> +
> +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
>  
>  	if (i915->params.enable_dpcd_backlight == 0 ||
> -	    !intel_dp_aux_display_control_capable(intel_connector))
> +	    (!force_dpcd &&
> !intel_dp_aux_display_control_capable(intel_connector)))
>  		return -ENODEV;
>  
>  	/*
> @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> intel_connector *intel_connector)
>  	 */
>  	if (i915->vbt.backlight.type !=
>  	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> -	    i915->params.enable_dpcd_backlight != 1 &&
> -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
>  		drm_info(&i915->drm,
>  			 "Panel advertises DPCD backlight support, but "
>  			 "VBT disagrees. If your backlight controls "
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

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Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Kai-Heng Feng]

Hi Lyude,

> On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> 
> Hi! I thought this patch rang a bell, we actually already had some discussion
> about this since there's a couple of other systems this was causing issues for.
> Unfortunately it never seems like that patch got sent out. Satadru?
> 
> (if I don't hear back from them soon, I'll just send out a patch for this
> myself)
> 
> JFYI - the proper fix here is to just drop the
> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As long as
> the backlight supports AUX_SET_CAP, that should be enough for us to control it.

Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?

Kai-Heng

> 
> 
> On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
>> HP DreamColor panel needs to be controlled via AUX interface. However,
>> it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
>> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
>> intel_dp_aux_display_control_capable() test.
>> 
>> Skip the test if the panel has force DPCD quirk.
>> 
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> ---
>> drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
>> 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
>> @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
>> intel_connector *intel_connector)
>> 	struct intel_panel *panel = &intel_connector->panel;
>> 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
>> 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
>> +	bool force_dpcd;
>> +
>> +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
>> +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
>> 
>> 	if (i915->params.enable_dpcd_backlight == 0 ||
>> -	    !intel_dp_aux_display_control_capable(intel_connector))
>> +	    (!force_dpcd &&
>> !intel_dp_aux_display_control_capable(intel_connector)))
>> 		return -ENODEV;
>> 
>> 	/*
>> @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
>> intel_connector *intel_connector)
>> 	 */
>> 	if (i915->vbt.backlight.type !=
>> 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
>> -	    i915->params.enable_dpcd_backlight != 1 &&
>> -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
>> -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
>> +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
>> 		drm_info(&i915->drm,
>> 			 "Panel advertises DPCD backlight support, but "
>> 			 "VBT disagrees. If your backlight controls "
> -- 
> Sincerely,
>      Lyude Paul (she/her)
>      Software Engineer at Red Hat

Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Kai-Heng Feng]

Hi Lyude,

> On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> 
> Hi! I thought this patch rang a bell, we actually already had some discussion
> about this since there's a couple of other systems this was causing issues for.
> Unfortunately it never seems like that patch got sent out. Satadru?
> 
> (if I don't hear back from them soon, I'll just send out a patch for this
> myself)
> 
> JFYI - the proper fix here is to just drop the
> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As long as
> the backlight supports AUX_SET_CAP, that should be enough for us to control it.

Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?

Kai-Heng

> 
> 
> On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
>> HP DreamColor panel needs to be controlled via AUX interface. However,
>> it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
>> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
>> intel_dp_aux_display_control_capable() test.
>> 
>> Skip the test if the panel has force DPCD quirk.
>> 
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> ---
>> drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
>> 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
>> @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
>> intel_connector *intel_connector)
>> 	struct intel_panel *panel = &intel_connector->panel;
>> 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
>> 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
>> +	bool force_dpcd;
>> +
>> +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
>> +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
>> 
>> 	if (i915->params.enable_dpcd_backlight == 0 ||
>> -	    !intel_dp_aux_display_control_capable(intel_connector))
>> +	    (!force_dpcd &&
>> !intel_dp_aux_display_control_capable(intel_connector)))
>> 		return -ENODEV;
>> 
>> 	/*
>> @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
>> intel_connector *intel_connector)
>> 	 */
>> 	if (i915->vbt.backlight.type !=
>> 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
>> -	    i915->params.enable_dpcd_backlight != 1 &&
>> -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
>> -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
>> +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
>> 		drm_info(&i915->drm,
>> 			 "Panel advertises DPCD backlight support, but "
>> 			 "VBT disagrees. If your backlight controls "
> -- 
> Sincerely,
>      Lyude Paul (she/her)
>      Software Engineer at Red Hat

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Re: [Intel-gfx] [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Kai-Heng Feng]

Hi Lyude,

> On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> 
> Hi! I thought this patch rang a bell, we actually already had some discussion
> about this since there's a couple of other systems this was causing issues for.
> Unfortunately it never seems like that patch got sent out. Satadru?
> 
> (if I don't hear back from them soon, I'll just send out a patch for this
> myself)
> 
> JFYI - the proper fix here is to just drop the
> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As long as
> the backlight supports AUX_SET_CAP, that should be enough for us to control it.

Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?

Kai-Heng

> 
> 
> On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
>> HP DreamColor panel needs to be controlled via AUX interface. However,
>> it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
>> DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
>> intel_dp_aux_display_control_capable() test.
>> 
>> Skip the test if the panel has force DPCD quirk.
>> 
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> ---
>> drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
>> 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
>> @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
>> intel_connector *intel_connector)
>> 	struct intel_panel *panel = &intel_connector->panel;
>> 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
>> 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
>> +	bool force_dpcd;
>> +
>> +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
>> +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
>> 
>> 	if (i915->params.enable_dpcd_backlight == 0 ||
>> -	    !intel_dp_aux_display_control_capable(intel_connector))
>> +	    (!force_dpcd &&
>> !intel_dp_aux_display_control_capable(intel_connector)))
>> 		return -ENODEV;
>> 
>> 	/*
>> @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
>> intel_connector *intel_connector)
>> 	 */
>> 	if (i915->vbt.backlight.type !=
>> 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
>> -	    i915->params.enable_dpcd_backlight != 1 &&
>> -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
>> -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
>> +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
>> 		drm_info(&i915->drm,
>> 			 "Panel advertises DPCD backlight support, but "
>> 			 "VBT disagrees. If your backlight controls "
> -- 
> Sincerely,
>      Lyude Paul (she/her)
>      Software Engineer at Red Hat

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https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

On Thu, 2020-10-08 at 10:32 +0800, Kai-Heng Feng wrote:
> Hi Lyude,
> 
> > On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> > 
> > Hi! I thought this patch rang a bell, we actually already had some
> > discussion
> > about this since there's a couple of other systems this was causing issues
> > for.
> > Unfortunately it never seems like that patch got sent out. Satadru?
> > 
> > (if I don't hear back from them soon, I'll just send out a patch for this
> > myself)
> > 
> > JFYI - the proper fix here is to just drop the
> > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As
> > long as
> > the backlight supports AUX_SET_CAP, that should be enough for us to control
> > it.
> 
> Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?\

Not yet - we need someone to help with reviewing my Intel HDR backlight
interface patches before we can drop that. I was just talking about dropping the
check where we don't enable the DPCD backlight if it claims to support
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP

> 
> Kai-Heng
> 
> > 
> > On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> > > HP DreamColor panel needs to be controlled via AUX interface. However,
> > > it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> > > intel_dp_aux_display_control_capable() test.
> > > 
> > > Skip the test if the panel has force DPCD quirk.
> > > 
> > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
> > > 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	struct intel_panel *panel = &intel_connector->panel;
> > > 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
> > > 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > +	bool force_dpcd;
> > > +
> > > +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
> > > 
> > > 	if (i915->params.enable_dpcd_backlight == 0 ||
> > > -	    !intel_dp_aux_display_control_capable(intel_connector))
> > > +	    (!force_dpcd &&
> > > !intel_dp_aux_display_control_capable(intel_connector)))
> > > 		return -ENODEV;
> > > 
> > > 	/*
> > > @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	 */
> > > 	if (i915->vbt.backlight.type !=
> > > 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> > > -	    i915->params.enable_dpcd_backlight != 1 &&
> > > -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> > > +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
> > > 		drm_info(&i915->drm,
> > > 			 "Panel advertises DPCD backlight support, but "
> > > 			 "VBT disagrees. If your backlight controls "
> > -- 
> > Sincerely,
> >      Lyude Paul (she/her)
> >      Software Engineer at Red Hat
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

On Thu, 2020-10-08 at 10:32 +0800, Kai-Heng Feng wrote:
> Hi Lyude,
> 
> > On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> > 
> > Hi! I thought this patch rang a bell, we actually already had some
> > discussion
> > about this since there's a couple of other systems this was causing issues
> > for.
> > Unfortunately it never seems like that patch got sent out. Satadru?
> > 
> > (if I don't hear back from them soon, I'll just send out a patch for this
> > myself)
> > 
> > JFYI - the proper fix here is to just drop the
> > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As
> > long as
> > the backlight supports AUX_SET_CAP, that should be enough for us to control
> > it.
> 
> Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?\

Not yet - we need someone to help with reviewing my Intel HDR backlight
interface patches before we can drop that. I was just talking about dropping the
check where we don't enable the DPCD backlight if it claims to support
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP

> 
> Kai-Heng
> 
> > 
> > On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> > > HP DreamColor panel needs to be controlled via AUX interface. However,
> > > it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> > > intel_dp_aux_display_control_capable() test.
> > > 
> > > Skip the test if the panel has force DPCD quirk.
> > > 
> > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
> > > 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	struct intel_panel *panel = &intel_connector->panel;
> > > 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
> > > 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > +	bool force_dpcd;
> > > +
> > > +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
> > > 
> > > 	if (i915->params.enable_dpcd_backlight == 0 ||
> > > -	    !intel_dp_aux_display_control_capable(intel_connector))
> > > +	    (!force_dpcd &&
> > > !intel_dp_aux_display_control_capable(intel_connector)))
> > > 		return -ENODEV;
> > > 
> > > 	/*
> > > @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	 */
> > > 	if (i915->vbt.backlight.type !=
> > > 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> > > -	    i915->params.enable_dpcd_backlight != 1 &&
> > > -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> > > +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
> > > 		drm_info(&i915->drm,
> > > 			 "Panel advertises DPCD backlight support, but "
> > > 			 "VBT disagrees. If your backlight controls "
> > -- 
> > Sincerely,
> >      Lyude Paul (she/her)
> >      Software Engineer at Red Hat
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

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Re: [Intel-gfx] [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

On Thu, 2020-10-08 at 10:32 +0800, Kai-Heng Feng wrote:
> Hi Lyude,
> 
> > On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> > 
> > Hi! I thought this patch rang a bell, we actually already had some
> > discussion
> > about this since there's a couple of other systems this was causing issues
> > for.
> > Unfortunately it never seems like that patch got sent out. Satadru?
> > 
> > (if I don't hear back from them soon, I'll just send out a patch for this
> > myself)
> > 
> > JFYI - the proper fix here is to just drop the
> > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As
> > long as
> > the backlight supports AUX_SET_CAP, that should be enough for us to control
> > it.
> 
> Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?\

Not yet - we need someone to help with reviewing my Intel HDR backlight
interface patches before we can drop that. I was just talking about dropping the
check where we don't enable the DPCD backlight if it claims to support
DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP

> 
> Kai-Heng
> 
> > 
> > On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> > > HP DreamColor panel needs to be controlled via AUX interface. However,
> > > it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> > > intel_dp_aux_display_control_capable() test.
> > > 
> > > Skip the test if the panel has force DPCD quirk.
> > > 
> > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
> > > 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	struct intel_panel *panel = &intel_connector->panel;
> > > 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
> > > 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > +	bool force_dpcd;
> > > +
> > > +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
> > > 
> > > 	if (i915->params.enable_dpcd_backlight == 0 ||
> > > -	    !intel_dp_aux_display_control_capable(intel_connector))
> > > +	    (!force_dpcd &&
> > > !intel_dp_aux_display_control_capable(intel_connector)))
> > > 		return -ENODEV;
> > > 
> > > 	/*
> > > @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	 */
> > > 	if (i915->vbt.backlight.type !=
> > > 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> > > -	    i915->params.enable_dpcd_backlight != 1 &&
> > > -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> > > +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
> > > 		drm_info(&i915->drm,
> > > 			 "Panel advertises DPCD backlight support, but "
> > > 			 "VBT disagrees. If your backlight controls "
> > -- 
> > Sincerely,
> >      Lyude Paul (she/her)
> >      Software Engineer at Red Hat
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

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Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

oh hold on, I misspoke. Here's the patch I was thinking of:

https://patchwork.freedesktop.org/series/82041/

On Thu, 2020-10-08 at 10:32 +0800, Kai-Heng Feng wrote:
> Hi Lyude,
> 
> > On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> > 
> > Hi! I thought this patch rang a bell, we actually already had some
> > discussion
> > about this since there's a couple of other systems this was causing issues
> > for.
> > Unfortunately it never seems like that patch got sent out. Satadru?
> > 
> > (if I don't hear back from them soon, I'll just send out a patch for this
> > myself)
> > 
> > JFYI - the proper fix here is to just drop the
> > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As
> > long as
> > the backlight supports AUX_SET_CAP, that should be enough for us to control
> > it.
> 
> Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?
> 
> Kai-Heng
> 
> > 
> > On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> > > HP DreamColor panel needs to be controlled via AUX interface. However,
> > > it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> > > intel_dp_aux_display_control_capable() test.
> > > 
> > > Skip the test if the panel has force DPCD quirk.
> > > 
> > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
> > > 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	struct intel_panel *panel = &intel_connector->panel;
> > > 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
> > > 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > +	bool force_dpcd;
> > > +
> > > +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
> > > 
> > > 	if (i915->params.enable_dpcd_backlight == 0 ||
> > > -	    !intel_dp_aux_display_control_capable(intel_connector))
> > > +	    (!force_dpcd &&
> > > !intel_dp_aux_display_control_capable(intel_connector)))
> > > 		return -ENODEV;
> > > 
> > > 	/*
> > > @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	 */
> > > 	if (i915->vbt.backlight.type !=
> > > 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> > > -	    i915->params.enable_dpcd_backlight != 1 &&
> > > -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> > > +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
> > > 		drm_info(&i915->drm,
> > > 			 "Panel advertises DPCD backlight support, but "
> > > 			 "VBT disagrees. If your backlight controls "
> > -- 
> > Sincerely,
> >      Lyude Paul (she/her)
> >      Software Engineer at Red Hat
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

oh hold on, I misspoke. Here's the patch I was thinking of:

https://patchwork.freedesktop.org/series/82041/

On Thu, 2020-10-08 at 10:32 +0800, Kai-Heng Feng wrote:
> Hi Lyude,
> 
> > On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> > 
> > Hi! I thought this patch rang a bell, we actually already had some
> > discussion
> > about this since there's a couple of other systems this was causing issues
> > for.
> > Unfortunately it never seems like that patch got sent out. Satadru?
> > 
> > (if I don't hear back from them soon, I'll just send out a patch for this
> > myself)
> > 
> > JFYI - the proper fix here is to just drop the
> > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As
> > long as
> > the backlight supports AUX_SET_CAP, that should be enough for us to control
> > it.
> 
> Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?
> 
> Kai-Heng
> 
> > 
> > On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> > > HP DreamColor panel needs to be controlled via AUX interface. However,
> > > it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> > > intel_dp_aux_display_control_capable() test.
> > > 
> > > Skip the test if the panel has force DPCD quirk.
> > > 
> > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
> > > 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	struct intel_panel *panel = &intel_connector->panel;
> > > 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
> > > 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > +	bool force_dpcd;
> > > +
> > > +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
> > > 
> > > 	if (i915->params.enable_dpcd_backlight == 0 ||
> > > -	    !intel_dp_aux_display_control_capable(intel_connector))
> > > +	    (!force_dpcd &&
> > > !intel_dp_aux_display_control_capable(intel_connector)))
> > > 		return -ENODEV;
> > > 
> > > 	/*
> > > @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	 */
> > > 	if (i915->vbt.backlight.type !=
> > > 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> > > -	    i915->params.enable_dpcd_backlight != 1 &&
> > > -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> > > +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
> > > 		drm_info(&i915->drm,
> > > 			 "Panel advertises DPCD backlight support, but "
> > > 			 "VBT disagrees. If your backlight controls "
> > -- 
> > Sincerely,
> >      Lyude Paul (she/her)
> >      Software Engineer at Red Hat
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
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Re: [Intel-gfx] [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Lyude Paul]

oh hold on, I misspoke. Here's the patch I was thinking of:

https://patchwork.freedesktop.org/series/82041/

On Thu, 2020-10-08 at 10:32 +0800, Kai-Heng Feng wrote:
> Hi Lyude,
> 
> > On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> > 
> > Hi! I thought this patch rang a bell, we actually already had some
> > discussion
> > about this since there's a couple of other systems this was causing issues
> > for.
> > Unfortunately it never seems like that patch got sent out. Satadru?
> > 
> > (if I don't hear back from them soon, I'll just send out a patch for this
> > myself)
> > 
> > JFYI - the proper fix here is to just drop the
> > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely. As
> > long as
> > the backlight supports AUX_SET_CAP, that should be enough for us to control
> > it.
> 
> Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT entirely?
> 
> Kai-Heng
> 
> > 
> > On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> > > HP DreamColor panel needs to be controlled via AUX interface. However,
> > > it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> > > intel_dp_aux_display_control_capable() test.
> > > 
> > > Skip the test if the panel has force DPCD quirk.
> > > 
> > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
> > > 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	struct intel_panel *panel = &intel_connector->panel;
> > > 	struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
> > > 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > +	bool force_dpcd;
> > > +
> > > +	force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > +				      DP_QUIRK_FORCE_DPCD_BACKLIGHT);
> > > 
> > > 	if (i915->params.enable_dpcd_backlight == 0 ||
> > > -	    !intel_dp_aux_display_control_capable(intel_connector))
> > > +	    (!force_dpcd &&
> > > !intel_dp_aux_display_control_capable(intel_connector)))
> > > 		return -ENODEV;
> > > 
> > > 	/*
> > > @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > intel_connector *intel_connector)
> > > 	 */
> > > 	if (i915->vbt.backlight.type !=
> > > 	    INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> > > -	    i915->params.enable_dpcd_backlight != 1 &&
> > > -	    !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > -			      DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> > > +	    i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
> > > 		drm_info(&i915->drm,
> > > 			 "Panel advertises DPCD backlight support, but "
> > > 			 "VBT disagrees. If your backlight controls "
> > -- 
> > Sincerely,
> >      Lyude Paul (she/her)
> >      Software Engineer at Red Hat
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Satadru Pramanik]

[-- Attachment #1.1: Type: text/plain, Size: 3980 bytes --]

Kevin Chowski said he would be geting to working on upstreaming a version
of that which was in the ChromeOS tree here:

https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2344844
when I last spoke to hi

(This was two weeks ago.)

Kevin - do you have any input on this?

Satadru

On Thu, Oct 8, 2020 at 1:07 PM Lyude Paul <lyude@redhat.com> wrote:

> oh hold on, I misspoke. Here's the patch I was thinking of:
>
> https://patchwork.freedesktop.org/series/82041/
>
> On Thu, 2020-10-08 at 10:32 +0800, Kai-Heng Feng wrote:
> > Hi Lyude,
> >
> > > On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> > >
> > > Hi! I thought this patch rang a bell, we actually already had some
> > > discussion
> > > about this since there's a couple of other systems this was causing
> issues
> > > for.
> > > Unfortunately it never seems like that patch got sent out. Satadru?
> > >
> > > (if I don't hear back from them soon, I'll just send out a patch for
> this
> > > myself)
> > >
> > > JFYI - the proper fix here is to just drop the
> > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely.
> As
> > > long as
> > > the backlight supports AUX_SET_CAP, that should be enough for us to
> control
> > > it.
> >
> > Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT
> entirely?
> >
> > Kai-Heng
> >
> > >
> > > On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> > > > HP DreamColor panel needs to be controlled via AUX interface.
> However,
> > > > it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> > > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> > > > intel_dp_aux_display_control_capable() test.
> > > >
> > > > Skip the test if the panel has force DPCD quirk.
> > > >
> > > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > > > ---
> > > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
> > > > 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> > > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > > @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > > intel_connector *intel_connector)
> > > >   struct intel_panel *panel = &intel_connector->panel;
> > > >   struct intel_dp *intel_dp =
> enc_to_intel_dp(intel_connector->encoder);
> > > >   struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > > + bool force_dpcd;
> > > > +
> > > > + force_dpcd = drm_dp_has_quirk(&intel_dp->desc,
> intel_dp->edid_quirks,
> > > > +                               DP_QUIRK_FORCE_DPCD_BACKLIGHT);
> > > >
> > > >   if (i915->params.enable_dpcd_backlight == 0 ||
> > > > -     !intel_dp_aux_display_control_capable(intel_connector))
> > > > +     (!force_dpcd &&
> > > > !intel_dp_aux_display_control_capable(intel_connector)))
> > > >           return -ENODEV;
> > > >
> > > >   /*
> > > > @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > > intel_connector *intel_connector)
> > > >    */
> > > >   if (i915->vbt.backlight.type !=
> > > >       INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> > > > -     i915->params.enable_dpcd_backlight != 1 &&
> > > > -     !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > > -                       DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> > > > +     i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
> > > >           drm_info(&i915->drm,
> > > >                    "Panel advertises DPCD backlight support, but "
> > > >                    "VBT disagrees. If your backlight controls "
> > > --
> > > Sincerely,
> > >      Lyude Paul (she/her)
> > >      Software Engineer at Red Hat
> --
> Sincerely,
>       Lyude Paul (she/her)
>       Software Engineer at Red Hat
>
>

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Re: [Intel-gfx] [PATCH 1/2] drm/i915/dpcd_bl: Skip testing control capability with force DPCD quirk

[Satadru Pramanik]

[-- Attachment #1.1: Type: text/plain, Size: 3980 bytes --]

Kevin Chowski said he would be geting to working on upstreaming a version
of that which was in the ChromeOS tree here:

https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2344844
when I last spoke to hi

(This was two weeks ago.)

Kevin - do you have any input on this?

Satadru

On Thu, Oct 8, 2020 at 1:07 PM Lyude Paul <lyude@redhat.com> wrote:

> oh hold on, I misspoke. Here's the patch I was thinking of:
>
> https://patchwork.freedesktop.org/series/82041/
>
> On Thu, 2020-10-08 at 10:32 +0800, Kai-Heng Feng wrote:
> > Hi Lyude,
> >
> > > On Oct 8, 2020, at 05:53, Lyude Paul <lyude@redhat.com> wrote:
> > >
> > > Hi! I thought this patch rang a bell, we actually already had some
> > > discussion
> > > about this since there's a couple of other systems this was causing
> issues
> > > for.
> > > Unfortunately it never seems like that patch got sent out. Satadru?
> > >
> > > (if I don't hear back from them soon, I'll just send out a patch for
> this
> > > myself)
> > >
> > > JFYI - the proper fix here is to just drop the
> > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP check from the code entirely.
> As
> > > long as
> > > the backlight supports AUX_SET_CAP, that should be enough for us to
> control
> > > it.
> >
> > Does the proper fix include dropping DP_QUIRK_FORCE_DPCD_BACKLIGHT
> entirely?
> >
> > Kai-Heng
> >
> > >
> > > On Wed, 2020-10-07 at 14:58 +0800, Kai-Heng Feng wrote:
> > > > HP DreamColor panel needs to be controlled via AUX interface.
> However,
> > > > it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and
> > > > DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass
> > > > intel_dp_aux_display_control_capable() test.
> > > >
> > > > Skip the test if the panel has force DPCD quirk.
> > > >
> > > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> > > > ---
> > > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++----
> > > > 1 file changed, 6 insertions(+), 4 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 acbd7eb66cbe..acf2e1c65290 100644
> > > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> > > > @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > > intel_connector *intel_connector)
> > > >   struct intel_panel *panel = &intel_connector->panel;
> > > >   struct intel_dp *intel_dp =
> enc_to_intel_dp(intel_connector->encoder);
> > > >   struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > > + bool force_dpcd;
> > > > +
> > > > + force_dpcd = drm_dp_has_quirk(&intel_dp->desc,
> intel_dp->edid_quirks,
> > > > +                               DP_QUIRK_FORCE_DPCD_BACKLIGHT);
> > > >
> > > >   if (i915->params.enable_dpcd_backlight == 0 ||
> > > > -     !intel_dp_aux_display_control_capable(intel_connector))
> > > > +     (!force_dpcd &&
> > > > !intel_dp_aux_display_control_capable(intel_connector)))
> > > >           return -ENODEV;
> > > >
> > > >   /*
> > > > @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct
> > > > intel_connector *intel_connector)
> > > >    */
> > > >   if (i915->vbt.backlight.type !=
> > > >       INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> > > > -     i915->params.enable_dpcd_backlight != 1 &&
> > > > -     !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> > > > -                       DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> > > > +     i915->params.enable_dpcd_backlight != 1 && !force_dpcd) {
> > > >           drm_info(&i915->drm,
> > > >                    "Panel advertises DPCD backlight support, but "
> > > >                    "VBT disagrees. If your backlight controls "
> > > --
> > > Sincerely,
> > >      Lyude Paul (she/her)
> > >      Software Engineer at Red Hat
> --
> Sincerely,
>       Lyude Paul (she/her)
>       Software Engineer at Red Hat
>
>

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