On Fri, Feb 12, 2021 at 5:30 PM Mario Kleiner mario.kleiner.de@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.de@gmail.com Cc: Alex Deucher alexdeucher@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
/* only use FRAME_COUNTER_MAX if frameRandom == 1*/-- 2.25.1