drm/amd/display: Update Cursor request mode to the beginning prefetch always

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[ Upstream commit 4a4077b4b6 ]

[Why]
The double buffer cursor registers is updated by the cursor
vupdate event. There is a gap between vupdate and cursor data
fetch if cursor fetch data reletive to cursor position.
Cursor corruption will happen if we update the cursor surface
in this gap.

[How]
Modify the cursor request mode to the beginning prefetch always
and avoid wraparound calculation issues.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Zhikai Zhai <zhikai.zhai@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Zhikai Zhai 2025-01-09 16:11:48 +08:00 • committed by Greg Kroah-Hartman

parent 0a5ba5e28b

commit cc301b9d48

2 changed files with 10 additions and 14 deletions

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22

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

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2

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubp.c

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