drm/radeon: do a posting read in evergreen_set_irq

commit c320bb5f upstream.

To make sure the writes go through the pci bridge.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=90741Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>

drivers/gpu/drm/radeon/evergreen.c

@@ -3474,6 +3474,9 @@ int evergreen_init(struct radeon_device *rdev)
 		}
 	}
 
+	/* posting read */
+	RREG32(SRBM_STATUS);
+
 	return 0;
 }