drm/amd/display: Add urgent watermark override for DCN42

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[why & how]
Out-of-urgent bandwidth delivery to DCN is very poor under workloads.
Even after asserting urgent, empirical data shows urgent return BW
delays of up to 100 μs. Override the value when programming
watermarks to avoid modifying mode support. Maintain the DML's calculated
value as a floor.

Signed-off-by: Ovidiu Bunea <ovidiu.bunea@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Ovidiu Bunea 2026-09-18 10:24:59 -04:00 • committed by Alex Deucher

parent 1b653a750b

commit 7f035f99c3

2 changed files with 26 additions and 16 deletions

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1

drivers/gpu/drm/amd/display/dc/dc.h

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41

drivers/gpu/drm/amd/display/dc/hubbub/dcn42/dcn42_hubbub.c

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