On Mon, Feb 15, 2021 at 8:09 PM Alex Deucher <alexdeuc...@gmail.com> wrote:
> On Fri, Feb 12, 2021 at 5:30 PM Mario Kleiner > <mario.kleiner...@gmail.com> 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...@gmail.com> > > Cc: Alex Deucher <alexdeuc...@gmail.com> > > --- > > 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 > > Certainly no objections from myself. -mario > > > > > /* only use FRAME_COUNTER_MAX if frameRandom == 1*/ > > -- > > 2.25.1 > > >
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