[Intel-gfx] [PATCH v2 1/4] drm/fourcc: Introduce format modifiers for DG2 render and media compression

[Imre Deak <imre.deak@intel.com>]

From: Matt Roper <matthew.d.roper@intel.com>

The render/media engines on DG2 unify render compression and media
compression into a single format for the first time, using the Tile 4
layout for main surfaces. The compression algorithm is different from
any previous platform and the display engine must still be configured to
decompress either a render or media compressed surface; as such, we
need new RC and MC framebuffer modifiers to represent buffers in this
format.

v2: Clarify modifier layout description.

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Matt Roper <matthew.d.roper@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/20220404133846.131401-2-imre.deak@intel.com
---
 include/uapi/drm/drm_fourcc.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index b73fe6797fc37..4a5117715db3c 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -583,6 +583,28 @@ extern "C" {
  */
 #define I915_FORMAT_MOD_4_TILED         fourcc_mod_code(INTEL, 9)
 
+/*
+ * Intel color control surfaces (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.
+ */
+#define I915_FORMAT_MOD_4_TILED_DG2_RC_CCS fourcc_mod_code(INTEL, 10)
+
+/*
+ * Intel color control surfaces (CCS) for DG2 media compression.
+ *
+ * The main surface is Tile 4 and at plane index 0. For semi-planar formats
+ * like NV12, the Y and UV planes are Tile 4 and are located at plane indices
+ * 0 and 1, respectively. The CCS for all planes are 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.
+ */
+#define I915_FORMAT_MOD_4_TILED_DG2_MC_CCS fourcc_mod_code(INTEL, 11)
+
 /*
  * Tiled, NV12MT, grouped in 64 (pixels) x 32 (lines) -sized macroblocks
  *
-- 
2.30.2