drm/radeon: do a posting read in r600_set_irq

[ Upstream commit 9d1393f23d5656cdd5f368efd60694d4aeed81d3 ]

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>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 56b02927cd3de5901da653bbea13cfcc7e9858ab..ee0868dec2f450cd62a62831bfafe9ce7299e990 100644 (file)
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -3787,6 +3787,9 @@ int r600_irq_set(struct radeon_device *rdev)
                WREG32(RV770_CG_THERMAL_INT, thermal_int);
        }
 
+       /* posting read */
+       RREG32(R_000E50_SRBM_STATUS);
+
        return 0;
 }