linux-kernel - Re: [PATCH] adv7511: Added mode_fixup function.

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Message-ID: <56BB0EA9.1040301@synopsys.com>
Date:	Wed, 10 Feb 2016 10:19:21 +0000
From:	Carlos Palminha <CARLOS.PALMINHA@...opsys.com>
To:	Lars-Peter Clausen <lars@...afoo.de>,
	Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	David Airlie <airlied@...ux.ie>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] adv7511: Added mode_fixup function.

Hi guys,

I agree that this should be fixed in the helper library.
There are already a lot of drivers that copy/paste code and several helper functions that do not avoid it.

I will start sending some patches to fix this type of issue in several places of DRM helper functions.

Regards,
C.Palminha

On 09-02-2016 09:24, Daniel Vetter wrote:
> On Thu, Feb 04, 2016 at 09:27:24PM +0100, Lars-Peter Clausen wrote:
>> On 02/04/2016 04:22 PM, Carlos Palminha wrote:
>>> Hi guys,
>>>
>>> any feedback? patch will be accepted for adv7511 driver?
>>
>> Hi,
>>
>> Thanks for the patch, but please try to find and fix the call site that is
>> trying to invoke the callback even though it does not exist.
>>
>> This is most likely drm_i2c_encoder_mode_fixup().
> 
> Agreed, this should be fixed in the helper library, not in drivers by
> copypasting piles more dummy functions.
> -Daniel
> 
>>
>> - Lars
>>
>>>
>>> Regards,
>>> C.Palminha
>>>
>>> On 01-02-2016 12:37, Carlos Palminha wrote:
>>>> 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,
>>>>>
>>> _______________________________________________
>>> dri-devel mailing list
>>> dri-devel@...ts.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/dri-devel
>>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

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