[Intel-gfx] [PATCH] Add support for Color encoding YCBCR_BT2020

[Ville Syrjälä]

On Fri, Feb 14, 2020 at 02:27:35PM +0000, Shankar, Uma wrote:
> 
> 
> > -----Original Message-----
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Sent: Friday, February 14, 2020 6:40 PM
> > To: Kadiyala, Kishore <kishore.kadiyala at intel.com>
> > Cc: intel-gfx at lists.freedesktop.org; Shankar, Uma <uma.shankar at intel.com>
> > Subject: Re: [Intel-gfx] [PATCH] Add support for Color encoding YCBCR_BT2020
> > 
> > On Fri, Feb 14, 2020 at 04:23:16PM +0530, Kishore Kadiyala wrote:
> > > Currently the plane property doesn't have support for YCBCR_BT2020,
> > > which enables the corresponding color conversion mode on plane CSC.
> > >
> > > Signed-off-by: Kishore Kadiyala <kishore.kadiyala at intel.com>
> > > Cc: Uma Shankar <uma.shankar at intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/display/intel_sprite.c | 9 +++++++--
> > >  1 file changed, 7 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c
> > > b/drivers/gpu/drm/i915/display/intel_sprite.c
> > > index 7abeefe8dce5..5169a7260d7c 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> > > @@ -3011,6 +3011,7 @@ skl_universal_plane_create(struct drm_i915_private
> > *dev_priv,
> > >  	struct intel_plane *plane;
> > >  	enum drm_plane_type plane_type;
> > >  	unsigned int supported_rotations;
> > > +	unsigned int supported_csc;
> > >  	unsigned int possible_crtcs;
> > >  	const u64 *modifiers;
> > >  	const u32 *formats;
> > > @@ -3088,9 +3089,13 @@ skl_universal_plane_create(struct drm_i915_private
> > *dev_priv,
> > >  					   DRM_MODE_ROTATE_0,
> > >  					   supported_rotations);
> > >
> > > +	supported_csc = BIT(DRM_COLOR_YCBCR_BT601) |
> > > +BIT(DRM_COLOR_YCBCR_BT709);
> > > +
> > > +	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
> > > +		supported_csc |= BIT(DRM_COLOR_YCBCR_BT2020);
> > 
> > Missing the actual code to enable it on glk and icl+ sdr planes, so this will not work.
> 
> Yeah this need to be handled for Non HDR planes.
> 
> > IIRC there was also some kind of hw fail related to some BT.something conversions.
> > But I can't remember if that was in the RGB->RGB or
> > YUV->RGB logic.
> 
> Will try to check this out. What kind of fails Ville, was it not all working or artifacts ?

IIRC a wrong coefficient was used in one of the hardcoded hw
matrices. Should be listed on the bspec w/a page.

-- 
Ville Syrjälä
Intel