[PATCH 3.4 068/172] drm/radeon: do a posting read in si_set_irq

[lizf]

From: Alex Deucher <alexander.deucher@xxxxxxx>

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

------------------


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@xxxxxxx>
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
 drivers/gpu/drm/radeon/si.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index e710073..068b21f 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -4126,6 +4126,9 @@ int si_init(struct radeon_device *rdev)
 		return -EINVAL;
 	}
 
+	/* posting read */
+	RREG32(SRBM_STATUS);
+
 	return 0;
 }
 
-- 
1.9.1

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