[Intel-gfx] [PATCH 13/16] drm/i915: Add NV12 as supported format for primary plane

[Srinivas, Vidya]

> -----Original Message-----
> From: Juha-Pekka Heikkila [mailto:juhapekka.heikkila at gmail.com]
> Sent: Wednesday, February 21, 2018 7:52 PM
> To: Srinivas, Vidya <vidya.srinivas at intel.com>; intel-
> gfx at lists.freedesktop.org
> Subject: Re: [Intel-gfx] [PATCH 13/16] drm/i915: Add NV12 as supported
> format for primary plane
> 
> On 21.02.2018 12:20, Vidya Srinivas wrote:
> > From: Chandra Konduru <chandra.konduru at intel.com>
> >
> > This patch adds NV12 to list of supported formats for primary plane
> >
> > v2: Rebased (Chandra Konduru)
> >
> > v3: Rebased (me)
> >
> > v4: Review comments by Ville addressed Removed the
> > skl_primary_formats_with_nv12 and added NV12 case in existing
> > skl_primary_formats
> >
> > v5: Rebased (me)
> >
> > v6: Missed the Tested-by/Reviewed-by in the previous series Adding the
> > same to commit message in this version.
> >
> > v7: Review comments by Ville addressed
> > 	Restricting the NV12 for BXT and on PIPE A and B Rebased (me)
> >
> > v8: Rebased (me)
> > Modified restricting the NV12 support for both BXT and KBL.
> >
> > v9: Rebased (me)
> >
> > v10: Addressed review comments from Maarten.
> > 	Adding NV12 inside skl_primary_formats itself.
> >
> > v11: Adding Reviewed By tag from Shashank Sharma
> >
> > Tested-by: Clinton Taylor <clinton.a.taylor at intel.com>
> > Reviewed-by: Clinton Taylor <clinton.a.taylor at intel.com>
> > Reviewed-by: Shashank Sharma <shashank.sharma at intel.com>
> > Signed-off-by: Chandra Konduru <chandra.konduru at intel.com>
> > Signed-off-by: Nabendu Maiti <nabendu.bikash.maiti at intel.com>
> > Signed-off-by: Vidya Srinivas <vidya.srinivas at intel.com>
> > ---
> >   drivers/gpu/drm/i915/intel_display.c | 5 +++++
> >   1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_display.c
> > b/drivers/gpu/drm/i915/intel_display.c
> > index 142dfe0..1870366 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -86,6 +86,7 @@ static const uint32_t skl_primary_formats[] = {
> >   	DRM_FORMAT_YVYU,
> >   	DRM_FORMAT_UYVY,
> >   	DRM_FORMAT_VYUY,
> > +	DRM_FORMAT_NV12,
> >   };
> >
> >   static const uint64_t skl_format_modifiers_noccs[] = { @@ -13282,6
> > +13283,10 @@ intel_primary_plane_create(struct drm_i915_private
> *dev_priv, enum pipe pipe)
> >   		intel_primary_formats = skl_primary_formats;
> >   		num_formats = ARRAY_SIZE(skl_primary_formats);
> >
> > +		if ((INTEL_GEN(dev_priv) == 9 && pipe == PIPE_C) &&
> > +		    !IS_GEMINILAKE(dev_priv))
> > +			num_formats -= 1;
> 
> This doesn't look future proof solution. This creates invisible dependency
> where it is required NV12 is last item in list of formats.

Initially we had a different array for this. But as a part of one of the review
comments, I made this change.

Regards
Vidya

> 
> > +
> >   		if (skl_plane_has_ccs(dev_priv, pipe, PLANE_PRIMARY))
> >   			modifiers = skl_format_modifiers_ccs;
> >   		else
> >