drm/amdgpu: disable HDP flushes on APUs

We completely bypass the HDP now.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c

@@ -172,7 +172,11 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 		}
 	}
 
-	if (ring->funcs->emit_hdp_flush)
+	if (ring->funcs->emit_hdp_flush
+#ifdef CONFIG_X86_64
+	    && !(adev->flags & AMD_IS_APU)
+#endif
+	   )
 		amdgpu_ring_emit_hdp_flush(ring);
 
 	skip_preamble = ring->current_ctx == fence_ctx;
@@ -202,7 +206,11 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 		need_ctx_switch = false;
 	}
 
-	if (ring->funcs->emit_hdp_invalidate)
+	if (ring->funcs->emit_hdp_invalidate
+#ifdef CONFIG_X86_64
+	    && !(adev->flags & AMD_IS_APU)
+#endif
+	   )
 		amdgpu_ring_emit_hdp_invalidate(ring);
 
 	r = amdgpu_fence_emit(ring, f);