diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 748265a..c34cbd2 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -1915,12 +1915,16 @@ static void combios_parse_mmio_table(struct drm_device *dev, uint16_t offset)
 			case 0:
 				val = RBIOS32(offset);
 				offset += 4;
+				(void)RREG32(addr);
 				WREG32(addr, val);
+				(void)RREG32(addr);
 				break;
 			case 1:
 				val = RBIOS32(offset);
 				offset += 4;
+				(void)RREG32(addr);
 				WREG32(addr, val);
+				(void)RREG32(addr);
 				break;
 			case 2:
 				and_mask = RBIOS32(offset);
@@ -1931,6 +1935,7 @@ static void combios_parse_mmio_table(struct drm_device *dev, uint16_t offset)
 				tmp &= and_mask;
 				tmp |= or_mask;
 				WREG32(addr, tmp);
+				(void)RREG32(addr);
 				break;
 			case 3:
 				and_mask = RBIOS32(offset);
@@ -1941,6 +1946,7 @@ static void combios_parse_mmio_table(struct drm_device *dev, uint16_t offset)
 				tmp &= and_mask;
 				tmp |= or_mask;
 				WREG32(addr, tmp);
+				(void)RREG32(addr);
 				break;
 			case 4:
 				val = RBIOS16(offset);