From e00a2e5d485faf53c7a24b9d1b575a642227947f Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Wed, 12 Feb 2025 18:18:51 +0200 Subject: drm: Fix DSC BPP increment decoding Starting with DPCD version 2.0 bits 6:3 of the DP_DSC_BITS_PER_PIXEL_INC DPCD register contains the NativeYCbCr422_MAX_bpp_DELTA field, which can be non-zero as opposed to earlier DPCD versions, hence decoding the bit_per_pixel increment value at bits 2:0 in the same register requires applying a mask, do so. Cc: Ankit Nautiyal Fixes: 0c2287c96521 ("drm/display/dp: Add helper function to get DSC bpp precision") Reviewed-by: Jani Nikula Signed-off-by: Imre Deak Link: https://patchwork.freedesktop.org/patch/msgid/20250212161851.4007005-1-imre.deak@intel.com --- include/drm/display/drm_dp.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h index a6f8b098c56f..3bd9f482f0c3 100644 --- a/include/drm/display/drm_dp.h +++ b/include/drm/display/drm_dp.h @@ -359,6 +359,7 @@ # define DP_DSC_BITS_PER_PIXEL_1_4 0x2 # 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_PSR_SUPPORT 0x070 /* XXX 1.2? */ # define DP_PSR_IS_SUPPORTED 1 -- cgit v1.2.3