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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>
(cherry picked from commit f3a2d86587)
Cc: stable@vger.kernel.org
This commit is contained in:
Travis K. Bangs
2026-08-03 15:13:52 -04:00
committed by Alex Deucher
parent 5227c2c77c
commit ff209cd048
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -2189,6 +2189,11 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
init_data.flags.unify_link_enc_assignment = true;
init_data.flags.usb4_bw_alloc_support = true;
}
/* DCN201 audio desyncs using DP SS */
if (adev->apu_flags & AMD_APU_IS_CYAN_SKILLFISH2)
init_data.flags.ignore_dpref_ss = true;
retrieve_dmi_info(&adev->dm);
if (adev->dm.edp0_on_dp1_quirk)
init_data.flags.support_edp0_on_dp1 = true;