[Intel-gfx] [PATCH v2] drm/i915: Add Plane color encoding support for YCBCR_BT2020

[Shankar, Uma]

> -----Original Message-----
> From: Kadiyala, Kishore <kishore.kadiyala at intel.com>
> Sent: Wednesday, April 8, 2020 2:18 PM
> To: intel-gfx at lists.freedesktop.org
> Cc: Kadiyala, Kishore <kishore.kadiyala at intel.com>; Ville Syrjala
> <ville.syrjala at linux.intel.com>; Shankar, Uma <uma.shankar at intel.com>
> Subject: [PATCH v2] drm/i915: Add Plane color encoding support for YCBCR_BT2020
> 
> Currently the plane property doesn't have support for YCBCR_BT2020, which enables
> the corresponding color conversion mode on plane CSC.
> This propery setting is confined only to HDR Planes as there is limitation in SDR
> Planes.

Append that this restriction is for ICL+

> 
> V2: Enabling support for YCBCT_BT2020 for HDR planes on
>     platforms GLK & ICL
> 
> Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
> Cc: Uma Shankar <uma.shankar at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_sprite.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c
> b/drivers/gpu/drm/i915/display/intel_sprite.c
> index deda351719db..4c25d90d16ce 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -3031,6 +3031,7 @@ 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;
>  	const u64 *modifiers;
>  	const u32 *formats;
>  	int num_formats;
> @@ -3105,9 +3106,14 @@ 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) &&
> +					(icl_is_hdr_plane(dev_priv, plane_id)))

Refine this condition to enable for all GLK planes and restrict this only to bottom 3 HDR planes
for ICL. Will be good to mention a comment as well that ICL SDR planes have some issues with BT2020
conversion, hence not enabling it on those planes for ICL.

> +		supported_csc |= BIT(DRM_COLOR_YCBCR_BT2020);
> +
>  	drm_plane_create_color_properties(&plane->base,
> -					  BIT(DRM_COLOR_YCBCR_BT601) |
> -					  BIT(DRM_COLOR_YCBCR_BT709),
> +					  supported_csc,

Handle the BT2020 format in glk_plane_color_ctl as well for GLK.

> BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
>  					  BIT(DRM_COLOR_YCBCR_FULL_RANGE),
>  					  DRM_COLOR_YCBCR_BT709,
> --
> 2.17.1