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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: 0575650077 ("drm/dp: DRM DP helper/macros to get DP sink DSC parameters")
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Manasi Navare <navaremanasi@google.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: <stable@vger.kernel.org> # v5.0+
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230406134615.1422509-1-jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2023-04-06 16:46:14 +03:00
parent 1b617bc931
commit 13525645e2
2 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/drm/display/drm_dp.h
View File

@ -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

5
include/drm/display/drm_dp_helper.h
View File

@ -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