On 5/27/2026 4:38 PM, Nemesa Garg wrote:
Define macros used for decoding DSC max bpp delta values
from the sink DPCD. This includes per-format masks for
RGB/YCbCr444 and YCbCr420, as well as definitions for delta
scaling and the YCbCr420 bit shift. Also add version_1 as
suffix to MAX_DELTA_BPP.
v2: Move constants under 0x6E register. [Ankit]
Add mask for Native 422 also. [Ankit]
v3: Rename _DSC_NATIVE4222 to _DSC_NATIVE_YCbCr422. [Ankit]
Signed-off-by: Nemesa Garg <[email protected]>
---
include/drm/display/drm_dp.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h
index dce290acf735..a905aa49d1d0 100644
--- a/include/drm/display/drm_dp.h
+++ b/include/drm/display/drm_dp.h
@@ -354,10 +354,14 @@
# define DP_DSC_20_PER_DP_DSC_SINK (1 << 1)
# define DP_DSC_24_PER_DP_DSC_SINK (1 << 2)
-#define DP_DSC_MAX_BPP_DELTA 0x06E
+#define DP_DSC_MAX_BPP_DELTA_VERSION_1 0x06E
This change should be in Patch#1.
This change will only add the new fields then.
With above fixed:
Reviewed-by: Ankit Nautiyal <[email protected]>
Regards,
Ankit
# define DP_DSC_RGB_YCbCr444_MAX_BPP_DELTA_MASK 0x1f
# define DP_DSC_NATIVE_YCbCr420_MAX_BPP_DELTA_MASK 0xe0
+# define DP_DSC_BPP_DELTA_444 16
+# define DP_DSC_BPP_DELTA_420 12
+# define DP_DSC_BPP_DELTA_SHIFT_420 5
+
#define DP_DSC_BITS_PER_PIXEL_INC 0x06F
# define DP_DSC_BITS_PER_PIXEL_1_16 0x0
# define DP_DSC_BITS_PER_PIXEL_1_8 0x1
@@ -365,6 +369,8 @@
# define DP_DSC_BITS_PER_PIXEL_1_2 0x3
# define DP_DSC_BITS_PER_PIXEL_1_1 0x4
# define DP_DSC_BITS_PER_PIXEL_MASK 0x7
+# define DP_DSC_NATIVE_YCbCr422_MAX_BPP_DELTA_MASK 0x78
+# define DP_DSC_BPP_DELTA_NATIVE_422 16
#define DP_PSR_SUPPORT 0x070 /* XXX 1.2? */
# define DP_PSR_IS_SUPPORTED 1
