[Intel-gfx] [PATCH v4 09/10] drm/framebuffer/tgl: Format modifier for Intel Gen 12 render compression with Clear Color

[Radhakrishna Sripada]

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)

Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Cc: Kalyan Kondapally <kalyan.kondapally at intel.com>
Cc: Rafael Antognolli <rafael.antognolli at intel.com>
Cc: Nanley Chery <nanley.g.chery at intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
---
 include/uapi/drm/drm_fourcc.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index dd9c85111e77..a20f2ea8ddc6 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -434,6 +434,17 @@ extern "C" {
  */
 #define I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS fourcc_mod_code(INTEL, 7)
 
+/*
+ * Intel color control surfaces Clear Color(CCS_CC) for Gen-12 render compression.
+ *
+ * The main surface is Y-tiled and is at plane index 0 whereas CCS_CC is linear
+ * and at index 1. The clear color is stored at index 2, and the pitch should
+ * be ignored. The size of clear color should be 64 bits. A CCS_CC 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
  *
-- 
2.20.1