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

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Date:	Tue, 9 Feb 2016 10:24:44 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	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.

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

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

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