drm/amd/display: PQ tail accuracy

Browse source

[WHY & HOW]
HW LUTs changed slightly in DCN3: 256 base+slope pairs were replaced by
257 bases. Code was still calculating all 256 base+slope and then
creating 257th pt as last base + last slope.
This was done in wrong format, and then "fixed" it by making the last
two points the same thus making the last slope=0.
However, this also created some precision problems near the end that
are not visible but they do show up with capture cards.

Solution is to calculate 257 and remove deltas since we no longer have
those HW registers.

Reviewed-by: Anthony Koo <anthony.koo@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Krunoslav Kovac <krunoslav.kovac@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Krunoslav Kovac 2023-08-08 14:33:42 -04:00 • committed by Alex Deucher

parent 53d8e3beea

commit 4d5fd3d08e

2 changed files with 33 additions and 88 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

104

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c

View file

17

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_mpc.c

View file