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drm/radeon/evergreen+: wait for the MC to settle after MC blackout

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commit ed39fadd6d upstream.

Some chips seem to need a little delay after blacking out
the MC before the requests actually stop.

May fix:
https://bugs.freedesktop.org/show_bug.cgi?id=56139
https://bugs.freedesktop.org/show_bug.cgi?id=57567

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Deucher 2013-01-31 09:00:52 -05:00 committed by Greg Kroah-Hartman
parent b0cc9fb10c
commit 36509fceea
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/radeon/evergreen.c
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@ -1179,6 +1179,8 @@ void evergreen_mc_stop(struct radeon_device *rdev, struct evergreen_mc_save *sav
blackout &= ~BLACKOUT_MODE_MASK;
WREG32(MC_SHARED_BLACKOUT_CNTL, blackout | 1);
}
/* wait for the MC to settle */
udelay(100);
}
void evergreen_mc_resume(struct radeon_device *rdev, struct evergreen_mc_save *save)