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drm/amd/pm: Disable MCLK switching with non-DC at 120 Hz+ (v2)

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According to pp_pm_compute_clocks the non-DC display code
has "issues with mclk switching with refresh rates over 120 hz".
The workaround is to disable MCLK switching in this case.

Do the same for legacy DPM.

Fixes: 6ddbd37f10 ("drm/amd/pm: optimize the amdgpu_pm_compute_clocks() implementations")
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Timur Kristóf
2025-08-28 17:11:09 +02:00
committed by Alex Deucher
parent 9003a07468
commit ed3803533c
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/amd/pm/amdgpu_dpm_internal.c
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@@ -66,6 +66,13 @@ u32 amdgpu_dpm_get_vblank_time(struct amdgpu_device *adev)
(amdgpu_crtc->v_border * 2));
vblank_time_us = vblank_in_pixels * 1000 / amdgpu_crtc->hw_mode.clock;
/* we have issues with mclk switching with
* refresh rates over 120 hz on the non-DC code.
*/
if (drm_mode_vrefresh(&amdgpu_crtc->hw_mode) > 120)
vblank_time_us = 0;
break;
}
}