From: Mika Kahola mika.kahola@intel.com

DG2 clear color render compression uses Tile4 layout. Therefore, we need to define a new format modifier for uAPI to support clear color rendering.

v2: Display version is fixed. [Imre] KDoc is enhanced for cc modifier. [Nanley & Lionel] v3: Split out the modifier addition to a separate patch. Clarify the modifier layout description.

Cc: dri-devel@lists.freedesktop.org Signed-off-by: Mika Kahola mika.kahola@intel.com cc: Anshuman Gupta anshuman.gupta@intel.com Signed-off-by: Juha-Pekka Heikkilä juha-pekka.heikkila@intel.com Signed-off-by: Ramalingam C ramalingam.c@intel.com Signed-off-by: Imre Deak imre.deak@intel.com Acked-by: Nanley Chery nanley.g.chery@intel.com Reviewed-by: Juha-Pekka Heikkila juhapekka.heikkila@gmail.com Acked-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20220404133846.131401-4-imre.d... --- include/uapi/drm/drm_fourcc.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index 4a5117715db3c..e5074162bcdd4 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -605,6 +605,20 @@ extern "C" { */ #define I915_FORMAT_MOD_4_TILED_DG2_MC_CCS fourcc_mod_code(INTEL, 11)

+/* + * Intel Color Control Surface with Clear Color (CCS) for DG2 render compression. + * + * The main surface is Tile 4 and at plane index 0. The CCS data is stored + * outside of the GEM object in a reserved memory area dedicated for the + * storage of the CCS data for all RC/RC_CC/MC compressible GEM objects. The + * main surface pitch is required to be a multiple of four Tile 4 widths. The + * clear color is stored at plane index 1 and the pitch should be ignored. The + * format of the 256 bits of clear color data matches the one used for the + * I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC modifier, see its description + * for details. + */ +#define I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC fourcc_mod_code(INTEL, 12) + /* * Tiled, NV12MT, grouped in 64 (pixels) x 32 (lines) -sized macroblocks *