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drm/radeon/r5xx-r7xx: wait for the MC to settle after MC blackout

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Some chips seem to need a little delay after blacking out
the MC before the requests actually stop. Stop DMAR errors
reported by Shuah Khan.

Reported-by: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2013-01-31 09:01:59 -05:00
parent ed39fadd6d
commit 39dc9aabd8
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/radeon/rv515.c
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@ -336,6 +336,8 @@ void rv515_mc_stop(struct radeon_device *rdev, struct rv515_mc_save *save)
WREG32(R600_CITF_CNTL, blackout);
}
}
/* wait for the MC to settle */
udelay(100);
}
void rv515_mc_resume(struct radeon_device *rdev, struct rv515_mc_save *save)