From: Alex Deucher <alexander.deuc...@amd.com>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

commit cffefd9bb31cd35ab745d3b49005d10616d25bdc 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.deuc...@amd.com>
Signed-off-by: Jiri Slaby <jsl...@suse.cz>
---
 drivers/gpu/drm/radeon/cik.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 6e2e4a859047..bb4c6573a525 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -6352,6 +6352,9 @@ int cik_irq_set(struct radeon_device *rdev)
        WREG32(DC_HPD5_INT_CONTROL, hpd5);
        WREG32(DC_HPD6_INT_CONTROL, hpd6);
 
+       /* posting read */
+       RREG32(SRBM_STATUS);
+
        return 0;
 }
 
-- 
2.3.3

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