On Thu, 16 Oct 2025, Yaroslav Bolyukin <[email protected]> wrote: > VESA vendor header from DisplayID spec may contain fixed bit per pixel > rate, it should be respected by drm driver > > Signed-off-by: Yaroslav Bolyukin <[email protected]> > --- > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 14 +++++++++++++- > 1 file changed, 13 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > index 0d03e324d5b9..ebe5bb4eecf8 100644 > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > @@ -6521,6 +6521,11 @@ static void > fill_stream_properties_from_drm_display_mode( > > stream->output_color_space = get_output_color_space(timing_out, > connector_state); > stream->content_type = get_output_content_type(connector_state); > + > + /* DisplayID Type VII pass-through timings. */ > + if (mode_in->dsc_passthrough_timings_support && info->dp_dsc_bpp != 0) { > + stream->timing.dsc_fixed_bits_per_pixel_x16 = info->dp_dsc_bpp; > + }
If we had mode->dp_dsc_bpp_x16 directly, or something better named, this would be simpler. This will eventually be replicated in a bunch of drivers. BR, Jani. > } > > static void fill_audio_info(struct audio_info *audio_info, > @@ -7067,6 +7072,13 @@ create_stream_for_sink(struct drm_connector *connector, > &mode, preferred_mode, scale); > > preferred_refresh = drm_mode_vrefresh(preferred_mode); > + > + /* > + * HACK: In case of multiple supported modes, we should > look at the matching mode to decide this flag. > + * But what is matching mode, how should it be decided? > + * Assuming that only preferred mode would have this > flag. > + */ > + mode.dsc_passthrough_timings_support = > preferred_mode->dsc_passthrough_timings_support; > } > } > > @@ -7756,7 +7768,7 @@ create_validate_stream_for_sink(struct drm_connector > *connector, > drm_dbg_kms(connector->dev, "%s:%d Validation failed > with %d, retrying w/ YUV420\n", > __func__, __LINE__, dc_result); > aconnector->force_yuv420_output = true; > - } > +} > stream = create_validate_stream_for_sink(connector, drm_mode, > dm_state, old_stream); > aconnector->force_yuv422_output = false; -- Jani Nikula, Intel
