drm/amd/display: Fix 'failed to blank crtc!'

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[ Upstream commit 01f60348d8 ]

[why]
DCN35 is having “DC: failed to blank crtc!” when running HPO
test cases. It's caused by not having sufficient udelay time.

[how]
Replace the old wait_for_blank_complete function with fsleep function to
sleep just until the next frame should come up. This way it doesn't poll
in case the pixel clock or other clock was bugged or until vactive and
the vblank are hit again.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Wen Chen <Wen.Chen3@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@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:

Wen Chen 2025-06-02 16:37:08 -04:00 • committed by Greg Kroah-Hartman

parent 6fed73112e

commit e80b670bc3

1 changed files with 1 additions and 1 deletions

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drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

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