drm/amdgpu/gfx8: Enable interrupt on ME1_PIPE3

BugLink: http://bugs.launchpad.net/bugs/1546572

Otherwise FW cannot see the RLC ACK for the memory clean request
It's for Stoney.
Signed-off-by: Flora Cui <Flora.Cui@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
(cherry picked from commit 3b55ddad)
Signed-off-by: Alberto Milone <alberto.milone@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -4257,6 +4257,11 @@ static int gfx_v8_0_cp_compute_resume(struct amdgpu_device *adev)
 		tmp = REG_SET_FIELD(tmp, CP_HQD_PERSISTENT_STATE, PRELOAD_SIZE, 0x53);
 		WREG32(mmCP_HQD_PERSISTENT_STATE, tmp);
 		mqd->cp_hqd_persistent_state = tmp;
+		if (adev->asic_type == CHIP_STONEY) {
+			tmp = RREG32(mmCP_ME1_PIPE3_INT_CNTL);
+			tmp = REG_SET_FIELD(tmp, CP_ME1_PIPE3_INT_CNTL, GENERIC2_INT_ENABLE, 1);
+			WREG32(mmCP_ME1_PIPE3_INT_CNTL, tmp);
+		}
 
 		/* activate the queue */
 		mqd->cp_hqd_active = 1;