drm/amd/display: Fix possible underflow for displays with large vblank

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[Why]
Underflow observed when using a display with a large vblank region
and low refresh rate

[How]
Simplify calculation of vblank_nom

Increase value for VBlankNomDefaultUS to 800us

Fixed a null pointer from previous commit of this change

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Daniel Miess <daniel.miess@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Daniel Miess 2023-05-11 10:51:27 -04:00 • committed by Alex Deucher

parent c02b04633c

commit de231189e7

1 changed files with 7 additions and 12 deletions

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

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19

drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c

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