Re: [Intel-gfx] [PATCH v7 1/3] drm/framebuffer: Format modifier for Intel Gen 12 render compression with Clear Color

["Chery, Nanley G" <nanley.g.chery@intel.com>]

> -----Original Message-----
> From: Imre Deak <imre.deak@intel.com>
> Sent: Thursday, January 14, 2021 12:13 PM
> To: intel-gfx@lists.freedesktop.org
> Cc: Sripada, Radhakrishna <radhakrishna.sripada@intel.com>; Ville Syrjala
> <ville.syrjala@linux.intel.com>; Pandiyan, Dhinakaran
> <dhinakaran.pandiyan@intel.com>; Kondapally, Kalyan
> <kalyan.kondapally@intel.com>; Rafael Antognolli
> <rafael.antognolli@intel.com>; Chery, Nanley G
> <nanley.g.chery@intel.com>; Daniel Vetter <daniel.vetter@ffwll.ch>; Nikula,
> Jani <jani.nikula@intel.com>
> Subject: [PATCH v7 1/3] drm/framebuffer: Format modifier for Intel Gen 12
> render compression with Clear Color
> 
> From: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
> 
> Gen12 display can decompress surfaces compressed by render engine with
> Clear Color, add a new modifier as the driver needs to know the surface
> was compressed by render engine.
> 
> V2: Description changes as suggested by Rafael.
> V3: Mention the Clear Color size of 64 bits in the comments(DK)
> v4: Fix trailing whitespaces
> v5: Explain Clear Color in the documentation.
> v6: Documentation Nitpicks(Nanley)
> 
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> Cc: Kalyan Kondapally <kalyan.kondapally@intel.com>
> Cc: Rafael Antognolli <rafael.antognolli@intel.com>
> Cc: Nanley Chery <nanley.g.chery@intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Acked-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  include/uapi/drm/drm_fourcc.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 

Acked-by: Nanley Chery <nanley.g.chery@intel.com>

> diff --git a/include/uapi/drm/drm_fourcc.h
> b/include/uapi/drm/drm_fourcc.h
> index 5f42a14481bd..f76de49c768f 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -527,6 +527,25 @@ extern "C" {
>   */
>  #define I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS
> fourcc_mod_code(INTEL, 7)
> 
> +/*
> + * Intel Color Control Surface with Clear Color (CCS) for Gen-12 render
> + * compression.
> + *
> + * The main surface is Y-tiled and is at plane index 0 whereas CCS is linear
> + * and at index 1. The clear color is stored at index 2, and the pitch should
> + * be ignored. The clear color structure is 256 bits. The first 128 bits
> + * represents Raw Clear Color Red, Green, Blue and Alpha color each
> represented
> + * by 32 bits. The raw clear color is consumed by the 3d engine and
> generates
> + * the converted clear color of size 64 bits. The first 32 bits store the Lower
> + * Converted Clear Color value and the next 32 bits store the Higher
> Converted
> + * Clear Color value when applicable. The Converted Clear Color values are
> + * consumed by the DE. The last 64 bits are used to store Color Discard
> Enable
> + * and Depth Clear Value Valid which are ignored by the DE. A CCS cache line
> + * corresponds to an area of 4x1 tiles in the main surface. The main surface
> + * pitch is required to be a multiple of 4 tile widths.
> + */
> +#define I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC
> fourcc_mod_code(INTEL, 8)
> +
>  /*
>   * Tiled, NV12MT, grouped in 64 (pixels) x 32 (lines) -sized macroblocks
>   *
> --
> 2.25.1

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