drm/radeon: reset dma engine on gpu reset (v2)

This try to reset the dma engine when performing gpu reset. Hopefully
bringing back the gpu dma engine in sane state.

v2: agd5f: fix dma reset on cayman/TN, add support for SI

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/nid.h b/drivers/gpu/drm/radeon/nid.h
index 22a62c6..48e5022 100644
--- a/drivers/gpu/drm/radeon/nid.h
+++ b/drivers/gpu/drm/radeon/nid.h
@@ -65,7 +65,7 @@
 #define		SOFT_RESET_VMC				(1 << 17)
 #define		SOFT_RESET_DMA				(1 << 20)
 #define		SOFT_RESET_TST				(1 << 21)
-#define		SOFT_RESET_REGBB		       	(1 << 22)
+#define		SOFT_RESET_REGBB			(1 << 22)
 #define		SOFT_RESET_ORB				(1 << 23)
 
 #define VM_CONTEXT0_REQUEST_RESPONSE			0x1470