On Fri, Feb 12, 2021 at 5:30 PM Mario Kleiner <mario.kleiner.de@xxxxxxxxx> wrote: > > Spatial dithering to 10 bpc depth was disabled for all DCE's. > Restrict this to DCE-11.0, but allow it on other DCE's. > > Testing on DCE-8.3 and DCE-11.2 did not show any obvious ill > effects, but a measureable precision improvement (via colorimeter) > when displaying a fp16 framebuffer to a 10 bpc DP or HDMI connected > HDR-10 monitor. > > Alex suggests this may have been a workaround for some DCE-11.0 > Carrizo and Stoney Asics, so lets try to restrict this to DCE 11.0. > > Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx> > Cc: Alex Deucher <alexdeucher@xxxxxxxxx> > --- > drivers/gpu/drm/amd/display/dc/dce/dce_opp.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_opp.c b/drivers/gpu/drm/amd/display/dc/dce/dce_opp.c > index 4600231da6cb..4ed886cdb8d8 100644 > --- a/drivers/gpu/drm/amd/display/dc/dce/dce_opp.c > +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_opp.c > @@ -216,9 +216,12 @@ static void set_spatial_dither( > REG_UPDATE(FMT_BIT_DEPTH_CONTROL, > FMT_TEMPORAL_DITHER_EN, 0); > > - /* no 10bpc on DCE11*/ > - if (params->flags.SPATIAL_DITHER_ENABLED == 0 || > - params->flags.SPATIAL_DITHER_DEPTH == 2) > + if (params->flags.SPATIAL_DITHER_ENABLED == 0) > + return; > + > + /* No dithering to 10 bpc on DCE-11.0 */ > + if (params->flags.SPATIAL_DITHER_DEPTH == 2 && > + opp110->base.ctx->dce_version == DCE_VERSION_11_0) > return; I'm inclined to just remove this check altogether. This is just the dithering control. I think the limitations are more around the formats (e.g., FP formats) than the dithering. Alex > > /* only use FRAME_COUNTER_MAX if frameRandom == 1*/ > -- > 2.25.1 > _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
