drm/amd: Disable DP audio spread spectrum for Cyan Skillfish

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The VBIOS for Cyan Skillfish devices (DCN201) indicates there is
DisplayPort ref clock spread spectrum downspread, so the audio clock
is corrected for it.

However, the clock source in this hardware does not seem to actually be
running with a clock downspread, so DisplayPort audio desyncs with video
after several minutes.

Ignore dprefclk SS downspread on CYAN_SKILLFISH2 asic.

Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5429
Signed-off-by: Travis K. Bangs <tbangs89@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Travis K. Bangs 2026-08-03 15:13:52 -04:00 • committed by Alex Deucher

parent 6f653bc88d

commit f3a2d86587

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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

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