[libdrm,v1,2/2] drm/fourcc: add msm compressed format modifiers

Commit Message

Tanmay Shah June 29, 2018, 8:16 p.m. UTC

Qualcomm Snapdragon chipsets uses compressed format
to optimize BW across multiple IP's. This change adds
needed modifier support in drm for a simple 4x4 tile
based compressed variants of base formats.

derived from kernel patch: https://patchwork.kernel.org/patch/10449533/

Signed-off-by: Tanmay Shah <[e-mail]>
---
 include/drm/drm_fourcc.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

Patch

diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index e04613d..85c6fe1 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -298,6 +298,19 @@  extern "C" {
  */
 #define DRM_FORMAT_MOD_SAMSUNG_64_32_TILE	fourcc_mod_code(SAMSUNG, 1)
 
+/*
+ * MSM compressed format
+ *
+ * Refers to the compressed variant of a base format.
+ * Implementation may be platform and base-format specific.
+ *
+ * Each macrotile consists of m x n (mostly 4 x 4) tiles.
+ * Pixel data pitch/stride is aligned with macrotile width.
+ * Pixel data height is aligned with macrotile height.
+ * Entire pixel data buffer is aligned with 4k(bytes).
+ */
+#define DRM_FORMAT_MOD_QCOM_COMPRESSED	fourcc_mod_code(QCOM, 1)
+
 /* Vivante framebuffer modifiers */
 
 /*