drm/amdgpu/vcn: Skip vcn power-gating change for sriov

CG/PG is handled on the host side.

Signed-off-by: Samir Dhume <samir.dhume@amd.com>
Acked-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Samir Dhume

drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c

@@ -1536,6 +1536,15 @@ static int vcn_v4_0_3_set_powergating_state(void *handle,
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	int ret;
 
+	/* for SRIOV, guest should not control VCN Power-gating
+	 * MMSCH FW should control Power-gating and clock-gating
+	 * guest should avoid touching CGC and PG
+	 */
+	if (amdgpu_sriov_vf(adev)) {
+		adev->vcn.cur_state = AMD_PG_STATE_UNGATE;
+		return 0;
+	}
+
 	if (state == adev->vcn.cur_state)
 		return 0;