linux-kernel - Re: [PATCH] adv7511: Added mode

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Date:	Mon, 1 Feb 2016 12:37:10 +0000
From:	Carlos Palminha <CARLOS.PALMINHA@...opsys.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Carlos Palminha <CARLOS.PALMINHA@...opsys.com>
CC:	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	"David Airlie" <airlied@...ux.ie>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Subject: Re: [PATCH] adv7511: Added mode_fixup function.

Hi Laurent

On 29-01-2016 17:48, Laurent Pinchart wrote:
> Hi Carlos,
> 
> Thank you for the patch.
> 
> On Friday 29 January 2016 10:33:47 Carlos Palminha wrote:
>> The mode_fixup is necessary when using it in a DRM FB driver pipeline.
> 
> Instead of implementing stubs in encoder drivers, wouldn't it be better to 
> make mode_fixup optional ?
Probably you are right but i don't have enough knowledge or time to do that for the DRM framework. :(
I limited myself to do what the other drivers already implement.

The patch is mandatory to have to the ADV working or else will get some NULL pointer crash.

Regards,
C.Palminha

> 
>> Signed-off-by: Carlos Palminha <palminha@...opsys.com>
>> ---
>>  drivers/gpu/drm/i2c/adv7511.c | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c
>> index 533d1e3..90082d2 100644
>> --- a/drivers/gpu/drm/i2c/adv7511.c
>> +++ b/drivers/gpu/drm/i2c/adv7511.c
>> @@ -648,6 +648,13 @@ adv7511_encoder_detect(struct drm_encoder *encoder,
>>  	return status;
>>  }
>>
>> +static bool adv7511_encoder_mode_fixup(struct drm_encoder *encoder,
>> +					const struct drm_display_mode *mode,
>> +					struct drm_display_mode *adjusted_mode)
>> +{
>> +	return true;
>> +}
>> +
>>  static int adv7511_encoder_mode_valid(struct drm_encoder *encoder,
>>  				      struct drm_display_mode *mode)
>>  {
>> @@ -754,6 +761,7 @@ static void adv7511_encoder_mode_set(struct drm_encoder
>> *encoder,
>>
>>  static const struct drm_encoder_slave_funcs adv7511_encoder_funcs = {
>>  	.dpms = adv7511_encoder_dpms,
>> +	.mode_fixup = adv7511_encoder_mode_fixup,
>>  	.mode_valid = adv7511_encoder_mode_valid,
>>  	.mode_set = adv7511_encoder_mode_set,
>>  	.detect = adv7511_encoder_detect,
> 


On 29-01-2016 17:48, Laurent Pinchart wrote:
> Hi Carlos,
> 
> Thank you for the patch.
> 
> On Friday 29 January 2016 10:33:47 Carlos Palminha wrote:
>> The mode_fixup is necessary when using it in a DRM FB driver pipeline.
> 
> Instead of implementing stubs in encoder drivers, wouldn't it be better to 
> make mode_fixup optional ?
> 
>> Signed-off-by: Carlos Palminha <palminha@...opsys.com>
>> ---
>>  drivers/gpu/drm/i2c/adv7511.c | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c
>> index 533d1e3..90082d2 100644
>> --- a/drivers/gpu/drm/i2c/adv7511.c
>> +++ b/drivers/gpu/drm/i2c/adv7511.c
>> @@ -648,6 +648,13 @@ adv7511_encoder_detect(struct drm_encoder *encoder,
>>  	return status;
>>  }
>>
>> +static bool adv7511_encoder_mode_fixup(struct drm_encoder *encoder,
>> +					const struct drm_display_mode *mode,
>> +					struct drm_display_mode *adjusted_mode)
>> +{
>> +	return true;
>> +}
>> +
>>  static int adv7511_encoder_mode_valid(struct drm_encoder *encoder,
>>  				      struct drm_display_mode *mode)
>>  {
>> @@ -754,6 +761,7 @@ static void adv7511_encoder_mode_set(struct drm_encoder
>> *encoder,
>>
>>  static const struct drm_encoder_slave_funcs adv7511_encoder_funcs = {
>>  	.dpms = adv7511_encoder_dpms,
>> +	.mode_fixup = adv7511_encoder_mode_fixup,
>>  	.mode_valid = adv7511_encoder_mode_valid,
>>  	.mode_set = adv7511_encoder_mode_set,
>>  	.detect = adv7511_encoder_detect,
>