diff options
| author | Mario Kleiner <mario.kleiner.de@gmail.com> | 2021-03-19 22:03:15 +0100 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-05-27 15:00:47 -0400 |
| commit | a316db7209604427b1f54e9a9d88f1f1ac0119c0 (patch) | |
| tree | f28a4033aaa6dc125bc971d839d310dc76361a86 /drivers/gpu/drm/amd/display/dc/dce110 | |
| parent | 050cd3d616d96c3a04f4877842a391c0a4fdcc7a (diff) | |
drm/amd/display: Increase linebuffer pixel depth to 36bpp.
Testing with the photometer shows that at least Raven Ridge DCN-1.0
does not achieve more than 10 bpc effective output precision with a
16 bpc unorm surface of type SURFACE_PIXEL_FORMAT_GRPH_ABGR16161616,
unless linebuffer depth is increased from LB_PIXEL_DEPTH_30BPP to
LB_PIXEL_DEPTH_36BPP. Otherwise precision gets truncated somewhere
to 10 bpc effective depth.
Strangely this increase was not needed on Polaris11 DCE-11.2 during
testing to get 12 bpc effective precision. It also is not needed for
fp16 framebuffers.
Tested on DCN-1.0 and DCE-11.2.
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dce110')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce110/dce110_transform_v.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_transform_v.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_transform_v.c index 29438c6050db..45bca0db5e5e 100644 --- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_transform_v.c +++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_transform_v.c @@ -708,7 +708,8 @@ bool dce110_transform_v_construct( xfm_dce->lb_pixel_depth_supported = LB_PIXEL_DEPTH_18BPP | LB_PIXEL_DEPTH_24BPP | - LB_PIXEL_DEPTH_30BPP; + LB_PIXEL_DEPTH_30BPP | + LB_PIXEL_DEPTH_36BPP; xfm_dce->prescaler_on = true; xfm_dce->lb_bits_per_entry = LB_BITS_PER_ENTRY; |