From 16bc193d78b00a1ec4eee3aad5afce5724769972 Mon Sep 17 00:00:00 2001 From: Nemesa Garg Date: Tue, 23 Jun 2026 15:12:35 +0530 Subject: [PATCH] drm/dp: Add max bpp delta computation constants 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] v4: Move Version_1 edit ti patch_1. [Ankit] Add shift mask for native also. [sashiko] Signed-off-by: Nemesa Garg Reviewed-by: Ankit Nautiyal Signed-off-by: Ankit Nautiyal Link: https://patch.msgid.link/20260623094236.1586318-4-nemesa.garg@intel.com --- include/drm/display/drm_dp.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h index 57e8143a1374..7154216e0aff 100644 --- a/include/drm/display/drm_dp.h +++ b/include/drm/display/drm_dp.h @@ -358,6 +358,10 @@ # 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 +369,9 @@ # 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_SHIFT_422 3 +# define DP_DSC_BPP_DELTA_NATIVE_422 16 #define DP_PSR_SUPPORT 0x070 /* XXX 1.2? */ # define DP_PSR_IS_SUPPORTED 1