The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x 13525645e2246ebc8a21bd656248d86022a6ee8f # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '2023051338-denial-player-e724@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^.. Possible dependencies: 13525645e224 ("drm/dsc: fix drm_edp_dsc_sink_output_bpp() DPCD high byte usage") 1482ec00be4a ("drm: Add missing DP DSC extended capability definitions.") 34f667634a0d ("drm/dp_mst: add passthrough_aux to struct drm_dp_mst_port") 5d1b8b4a14f7 ("drm/display: Split DisplayPort header into core and helper") da68386d9edb ("drm: Rename dp/ to display/") c9e9ce0b6f85 ("Merge tag 'drm-misc-next-2022-03-03' of git://anongit.freedesktop.org/drm/drm-misc into drm-next") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 13525645e2246ebc8a21bd656248d86022a6ee8f Mon Sep 17 00:00:00 2001 From: Jani Nikula <jani.nikula@xxxxxxxxx> Date: Thu, 6 Apr 2023 16:46:14 +0300 Subject: [PATCH] drm/dsc: fix drm_edp_dsc_sink_output_bpp() DPCD high byte usage The operator precedence between << and & is wrong, leading to the high byte being completely ignored. For example, with the 6.4 format, 32 becomes 0 and 24 becomes 8. Fix it, and remove the slightly confusing and unnecessary DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT macro while at it. Fixes: 0575650077ea ("drm/dp: DRM DP helper/macros to get DP sink DSC parameters") Cc: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx> Cc: Manasi Navare <navaremanasi@xxxxxxxxxx> Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # v5.0+ Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20230406134615.1422509-1-jani.nikula@xxxxxxxxx diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h index 632376c291db..4545ed610958 100644 --- a/include/drm/display/drm_dp.h +++ b/include/drm/display/drm_dp.h @@ -286,7 +286,6 @@ #define DP_DSC_MAX_BITS_PER_PIXEL_HI 0x068 /* eDP 1.4 */ # define DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK (0x3 << 0) -# define DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT 8 # define DP_DSC_MAX_BPP_DELTA_VERSION_MASK 0x06 # define DP_DSC_MAX_BPP_DELTA_AVAILABILITY 0x08 diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h index ab55453f2d2c..ade9df59e156 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -181,9 +181,8 @@ static inline u16 drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) { return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] | - (dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] & - DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK << - DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT); + ((dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] & + DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK) << 8); } static inline u32
