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

[Ville Syrjälä]

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.

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.

Also clearly commit 27ee72477c9b ("drm/i915/icl: Handle YCbCr to RGB
conversion for BT2020 case") was never actually tested :(

> +
>  	drm_plane_create_color_properties(&plane->base,
> -					  BIT(DRM_COLOR_YCBCR_BT601) |
> -					  BIT(DRM_COLOR_YCBCR_BT709),
> +					  supported_csc,
>  					  BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
>  					  BIT(DRM_COLOR_YCBCR_FULL_RANGE),
>  					  DRM_COLOR_YCBCR_BT709,
> -- 
> 2.17.1
> 
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-- 
Ville Syrjälä
Intel