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; /* 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
