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

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Message-ID: <20160210121747.GS11240@phenom.ffwll.local>
Date:	Wed, 10 Feb 2016 13:17:47 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Carlos Palminha <CARLOS.PALMINHA@...opsys.com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	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.

On Wed, Feb 10, 2016 at 10:19:21AM +0000, Carlos Palminha wrote:
> 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.

Awesome, thanks a lot for doing this.
-Daniel

> 
> 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
> > 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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