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drm/i915/dp_mst: Fix DSC input BPP computation

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The branch or sink device decompressing a stream may have a limitation
on the input/uncompressed BPP, which is lower than the base line BPP
(determined by the sink's EDID). In some cases a stream with an input
BPP higher than this limit will be converted automatically by the device
decompressing the stream, by truncating the BPP, however in some cases
- seen at least in Dell dock's DP->HDMI converters - the decompression
will fail.

Fix the above by limiting the input BPP correctly. This is done already
correctly for SST outputs.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240611153351.3013235-1-imre.deak@intel.com
This commit is contained in:
Imre Deak
2024-06-11 18:33:51 +03:00
parent 5a5bdc17a2
commit efde66b965
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/display/intel_dp_mst.c
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@@ -349,6 +349,8 @@ static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder,
if (max_bpp > sink_max_bpp)
max_bpp = sink_max_bpp;
crtc_state->pipe_bpp = max_bpp;
max_compressed_bpp = intel_dp_dsc_sink_max_compressed_bpp(connector,
crtc_state,
max_bpp / 3);