[PATCH] drm/fsl-dcu: set DPMS off before initializing connector

[PATCH] drm/fsl-dcu: set DPMS off before initializing connector

[Stefan Agner]

Since commit 4a97a3da420b ("drm: Don't update property values for atomic
drivers") atomic drivers must not update property values as properties
are read from the state instead. To catch remaining users, the
drm_object_property_set_value() function now throws a warning when
called by atomic drivers on non-immutable properties, and we hit that
warning when creating connectors.

The easy fix is to just remove the drm_object_property_set_value() as it
is used here to set the initial value of the connector's DPMS property
to OFF. The DPMS property applies on top of the connector's state crtc
pointer (initialized to NULL) that is the main connector on/off control,
and should thus default to ON.

Fixes: 4a97a3da420b ("drm: Don't update property values for atomic drivers")
Cc: stable@vger.kernel.org
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index edd7d8127d19..c54806d08dd7 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -102,7 +102,6 @@ static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 {
 	struct drm_encoder *encoder = &fsl_dev->encoder;
 	struct drm_connector *connector = &fsl_dev->connector.base;
-	struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;
 	int ret;
 
 	fsl_dev->connector.encoder = encoder;
@@ -122,10 +121,6 @@ static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 	if (ret < 0)
 		goto err_sysfs;
 
-	drm_object_property_set_value(&connector->base,
-				      mode_config->dpms_property,
-				      DRM_MODE_DPMS_OFF);
-
 	ret = drm_panel_attach(panel, connector);
 	if (ret) {
 		dev_err(fsl_dev->dev, "failed to attach panel\n");
-- 
2.14.2

Re: [PATCH] drm/fsl-dcu: set DPMS off before initializing connector

[Laurent Pinchart]

Hi Stefan,

Thank you for the patch.

On Thursday, 9 November 2017 11:14:36 EET Stefan Agner wrote:

I notice you have changed the subject line. I'm not sure if the new wording is 
better, as this patch doesn't set DPMS to off, it instead skips setting it 
manually. How about "drm/fsl-dcu: Don't set connector DPMS property manually" 
or "drm/fsl-dcu: Don't set DPMS property before initializing connector" ?

Additionally, would you mind retaining the authorship of the patch I have 
originally submitted ?

> Since commit 4a97a3da420b ("drm: Don't update property values for atomic
> drivers") atomic drivers must not update property values as properties
> are read from the state instead. To catch remaining users, the
> drm_object_property_set_value() function now throws a warning when
> called by atomic drivers on non-immutable properties, and we hit that
> warning when creating connectors.
> 
> The easy fix is to just remove the drm_object_property_set_value() as it
> is used here to set the initial value of the connector's DPMS property
> to OFF. The DPMS property applies on top of the connector's state crtc
> pointer (initialized to NULL) that is the main connector on/off control,
> and should thus default to ON.
> 
> Fixes: 4a97a3da420b ("drm: Don't update property values for atomic drivers")
> Cc: stable@vger.kernel.org
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c index
> edd7d8127d19..c54806d08dd7 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> @@ -102,7 +102,6 @@ static int fsl_dcu_attach_panel(struct
> fsl_dcu_drm_device *fsl_dev, {
>  	struct drm_encoder *encoder = &fsl_dev->encoder;
>  	struct drm_connector *connector = &fsl_dev->connector.base;
> -	struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;

Oops, I had missed that, sorry.

>  	int ret;
> 
>  	fsl_dev->connector.encoder = encoder;
> @@ -122,10 +121,6 @@ static int fsl_dcu_attach_panel(struct
> fsl_dcu_drm_device *fsl_dev, if (ret < 0)
>  		goto err_sysfs;
> 
> -	drm_object_property_set_value(&connector->base,
> -				      mode_config->dpms_property,
> -				      DRM_MODE_DPMS_OFF);
> -
>  	ret = drm_panel_attach(panel, connector);
>  	if (ret) {
>  		dev_err(fsl_dev->dev, "failed to attach panel\n");

-- 
Regards,

Laurent Pinchart

Re: [PATCH] drm/fsl-dcu: set DPMS off before initializing connector

[Stefan Agner]

Hi Laurent,

On 2017-11-09 11:45, Laurent Pinchart wrote:
> Hi Stefan,
> 
> Thank you for the patch.
> 
> On Thursday, 9 November 2017 11:14:36 EET Stefan Agner wrote:
> 
> I notice you have changed the subject line. I'm not sure if the new wording is 
> better, as this patch doesn't set DPMS to off, it instead skips setting it 
> manually. How about "drm/fsl-dcu: Don't set connector DPMS property manually" 
> or "drm/fsl-dcu: Don't set DPMS property before initializing connector" ?

In a first version I also added:

connector->dpms = DRM_MODE_DPMS_OFF;

before calling drm_connector_init, but I think this is not really
required so removed it again, but forgot to adjust the subject.

Will reset to "drm/fsl-dcu: Don't set connector DPMS property"

> 
> Additionally, would you mind retaining the authorship of the patch I have 
> originally submitted ?

Yeah, sorry, will send v2 with proper authorship and subject.

--
Stefan


>> Since commit 4a97a3da420b ("drm: Don't update property values for atomic
>> drivers") atomic drivers must not update property values as properties
>> are read from the state instead. To catch remaining users, the
>> drm_object_property_set_value() function now throws a warning when
>> called by atomic drivers on non-immutable properties, and we hit that
>> warning when creating connectors.
>>
>> The easy fix is to just remove the drm_object_property_set_value() as it
>> is used here to set the initial value of the connector's DPMS property
>> to OFF. The DPMS property applies on top of the connector's state crtc
>> pointer (initialized to NULL) that is the main connector on/off control,
>> and should thus default to ON.
>>
>> Fixes: 4a97a3da420b ("drm: Don't update property values for atomic drivers")
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>> Signed-off-by: Stefan Agner <stefan@agner.ch>
>> ---
>>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 5 -----
>>  1 file changed, 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
>> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c index
>> edd7d8127d19..c54806d08dd7 100644
>> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
>> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
>> @@ -102,7 +102,6 @@ static int fsl_dcu_attach_panel(struct
>> fsl_dcu_drm_device *fsl_dev, {
>>  	struct drm_encoder *encoder = &fsl_dev->encoder;
>>  	struct drm_connector *connector = &fsl_dev->connector.base;
>> -	struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;
> 
> Oops, I had missed that, sorry.
> 
>>  	int ret;
>>
>>  	fsl_dev->connector.encoder = encoder;
>> @@ -122,10 +121,6 @@ static int fsl_dcu_attach_panel(struct
>> fsl_dcu_drm_device *fsl_dev, if (ret < 0)
>>  		goto err_sysfs;
>>
>> -	drm_object_property_set_value(&connector->base,
>> -				      mode_config->dpms_property,
>> -				      DRM_MODE_DPMS_OFF);
>> -
>>  	ret = drm_panel_attach(panel, connector);
>>  	if (ret) {
>>  		dev_err(fsl_dev->dev, "failed to attach panel\n");