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. Signed-off-by: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/display/intel_dp_mst.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index 00fdcbc28e9b7..15c20bedea091 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -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); -- 2.43.3
