drm/fourcc: Add packed 10bit YUV 4:2:0 format

Adds a format that is 3 10bit YUV 4:2:0 samples packed into
a 32bit work (with 2 spare bits).

Supported on Broadcom BCM2711 chips.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index eda832f..8537a41 100644 (file)
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -266,6 +266,9 @@ const struct drm_format_info *__drm_format_info(u32 format)
                  .num_planes = 3, .char_per_block = { 2, 2, 2 },
                  .block_w = { 1, 1, 1 }, .block_h = { 1, 1, 1 }, .hsub = 0,
                  .vsub = 0, .is_yuv = true },
+               { .format = DRM_FORMAT_P030,            .depth = 0,  .num_planes = 2,
+                 .char_per_block = { 4, 4, 0 }, .block_w = { 3, 0, 0 }, .block_h = { 1, 0, 0 },
+                 .hsub = 2, .vsub = 2, .is_yuv = true},
        };
 
        unsigned int i;

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index 9f4bb4a..dcf0c65 100644 (file)
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -325,6 +325,13 @@ extern "C" {
 #define DRM_FORMAT_Q401                fourcc_code('Q', '4', '0', '1')
 
 /*
+ * 2 plane YCbCr MSB aligned, 3 pixels packed into 4 bytes.
+ * index 0 = Y plane, [31:0] x:Y2:Y1:Y0 2:10:10:10 little endian
+ * index 1 = Cr:Cb plane, [63:0] x:Cr2:Cb2:Cr1:x:Cb1:Cr0:Cb0 [2:10:10:10:2:10:10:10] little endian
+ */
+#define DRM_FORMAT_P030                fourcc_code('P', '0', '3', '0') /* 2x2 subsampled Cr:Cb plane 10 bits per channel packed */
+
+/*
  * 3 plane YCbCr
  * index 0: Y plane, [7:0] Y
  * index 1: Cb plane, [7:0] Cb
@@ -842,6 +849,10 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
  * and UV.  Some SAND-using hardware stores UV in a separate tiled
  * image from Y to reduce the column height, which is not supported
  * with these modifiers.
+ *
+ * The DRM_FORMAT_MOD_BROADCOM_SAND128_COL_HEIGHT modifier is also
+ * supported for DRM_FORMAT_P030 where the columns remain as 128 bytes
+ * wide, but as this is a 10 bpp format that translates to 96 pixels.
  */
 
 #define DRM_FORMAT_MOD_BROADCOM_SAND32_COL_HEIGHT(v) \