On Thu, Aug 24, 2023 at 11:05:13AM +0300, Imre Deak wrote: > Atm DSC decompression is enabled in the sink only if the first stream is > compressed. This left compressed streams blank if the first stream was > uncompressed. > > Enable decompression whenever FEC is enabled, which will be true for all > streams if any stream is compressed. Enabling FEC correctly in all > streams will be only fixed by an upcoming patch. > > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx> > --- > drivers/gpu/drm/i915/display/intel_dp.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c > index 48f005932ad8b..e5b1567d2a9d4 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -2907,7 +2907,13 @@ void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp, > struct drm_i915_private *i915 = dp_to_i915(intel_dp); > int ret; > > - if (!crtc_state->dsc.compression_enable) > + /* > + * In case of MST any stream can be compressed not just the first. If > + * any stream is compressed FEC will be enabled in all streams, so toggle > + * decompression whenever FEC is enabled. > + */ > + if (!crtc_state->dsc.compression_enable && > + !crtc_state->fec_enable) > return; > > ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_DSC_ENABLE, > -- > 2.37.2 >
