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| author | Imre Deak <imre.deak@intel.com> | 2025-02-12 18:18:51 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 14:01:21 +0100 |
| commit | 740bc21e25825c67444cd94ecd6b08669d48e95c (patch) | |
| tree | c5bf484b7c8f458a262538748d3c7c37e5f7cb5d /drivers/gpu | |
| parent | d1d10bd595539ed82ab59b60249f9bdf0994f678 (diff) | |
| download | linux-740bc21e25825c67444cd94ecd6b08669d48e95c.tar.gz linux-740bc21e25825c67444cd94ecd6b08669d48e95c.tar.bz2 linux-740bc21e25825c67444cd94ecd6b08669d48e95c.zip | |
drm: Fix DSC BPP increment decoding
[ Upstream commit e00a2e5d485faf53c7a24b9d1b575a642227947f ]
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 <ankit.k.nautiyal@intel.com>
Fixes: 0c2287c96521 ("drm/display/dp: Add helper function to get DSC bpp precision")
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250212161851.4007005-1-imre.deak@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_helper.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 6ee51003de3c..9fa13da513d2 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -2421,7 +2421,7 @@ u8 drm_dp_dsc_sink_bpp_incr(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) { u8 bpp_increment_dpcd = dsc_dpcd[DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT]; - switch (bpp_increment_dpcd) { + switch (bpp_increment_dpcd & DP_DSC_BITS_PER_PIXEL_MASK) { case DP_DSC_BITS_PER_PIXEL_1_16: return 16; case DP_DSC_BITS_PER_PIXEL_1_8: |