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drm/radeon: do a posting read in si_set_irq

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commit 0586915ec10d0ae60de5cd3381ad25a704760402 upstream.

To make sure the writes go through the pci bridge.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=90741

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 2015-03-02 20:43:53 -05:00 committed by Greg Kroah-Hartman
parent 96e612822a
commit 693fcdbda7
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/radeon/si.c
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@ -5778,5 +5778,8 @@ int si_set_uvd_clocks(struct radeon_device *rdev, u32 vclk, u32 dclk)
mdelay(100);
/* posting read */
RREG32(SRBM_STATUS);
return 0;
}