drm/radeon/dpm: Disable sclk switching on Oland when two 4K 60Hz monitors are connected

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Screen flickers rapidly when two 4K 60Hz monitors are in use. This issue
doesn't happen when one monitor is 4K 60Hz (pixelclock 594MHz) and
another one is 4K 30Hz (pixelclock 297MHz).

The issue is gone after setting "power_dpm_force_performance_level" to
"high". Following the indication, we found that the issue occurs when
sclk is too low.

So resolve the issue by disabling sclk switching when there are two
monitors requires high pixelclock (> 297MHz).

v2:
 - Only apply the fix to Oland.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

...

This commit is contained in:

Kai-Heng Feng 2021-04-30 12:56:56 +08:00 • committed by Alex Deucher

parent 5c1a376823

commit 227545b9a0

3 changed files with 12 additions and 0 deletions

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1

drivers/gpu/drm/radeon/radeon.h

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8

drivers/gpu/drm/radeon/radeon_pm.c

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3

drivers/gpu/drm/radeon/si_dpm.c

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