1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 279801ca5110..04f2514f7564 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -728,6 +728,10 @@ int r100_irq_set(struct radeon_device *rdev)
                 tmp |= RADEON_FP2_DETECT_MASK;
         }
         WREG32(RADEON_GEN_INT_CNTL, tmp);
+
+        /* read back to post the write */
+        RREG32(RADEON_GEN_INT_CNTL);
+
         return 0;
 }