drm/amdgpu: refine cz uvd clock gate logic.

sw clockgate was used on uvd6.0.
when uvd is idle, we gate the uvd clock.
when decode, we ungate the uvd clock.

Signed-off-by: Rex Zhu <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 
 	if (gate) {
 		if (pi->caps_uvd_pg) {
-			/* disable clockgating so we can properly shut down the block */
 			ret = amdgpu_set_clockgating_state(adev, AMD_IP_BLOCK_TYPE_UVD,
-							    AMD_CG_STATE_UNGATE);
+							    AMD_CG_STATE_GATE);
 			if (ret) {
 				DRM_ERROR("UVD DPM Power Gating failed to set clockgating state\n");
 				return;
···
 				return;
 			}
 
-			/* enable clockgating. hw will dynamically gate/ungate clocks on the fly */
 			ret = amdgpu_set_clockgating_state(adev, AMD_IP_BLOCK_TYPE_UVD,
-							    AMD_CG_STATE_GATE);
+							    AMD_CG_STATE_UNGATE);
 			if (ret) {
 				DRM_ERROR("UVD DPM Power Gating Failed to set clockgating state\n");
 				return;

drivers/gpu/drm/amd/powerplay/hwmgr/cz_clockpowergating.c

···
 	if (bgate) {
 		cgs_set_clockgating_state(hwmgr->device,
 						AMD_IP_BLOCK_TYPE_UVD,
-						AMD_CG_STATE_UNGATE);
+						AMD_CG_STATE_GATE);
 		cgs_set_powergating_state(hwmgr->device,
 						AMD_IP_BLOCK_TYPE_UVD,
 						AMD_PG_STATE_GATE);
···
 						AMD_CG_STATE_UNGATE);
 		cgs_set_clockgating_state(hwmgr->device,
 						AMD_IP_BLOCK_TYPE_UVD,
-						AMD_PG_STATE_GATE);
+						AMD_PG_STATE_UNGATE);
 		cz_dpm_update_uvd_dpm(hwmgr, false);
 	}