drm/amdgpu: Refine function name and function args

There are no any logical changes here.

1. change function names:
   amdgpu_device_ip_late_set_pg/cg_state to
   amdgpu_device_set_pg/cg_state.
2. add a function argument cg/pg_state, so
   we can enable/disable cg/pg through those functions
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1690,24 +1690,26 @@ static bool amdgpu_device_check_vram_lost(struct amdgpu_device *adev)
 }
 
 /**
- * amdgpu_device_ip_late_set_cg_state - late init for clockgating
+ * amdgpu_device_set_cg_state - set clockgating for amdgpu device
  *
  * @adev: amdgpu_device pointer
  *
- * Late initialization pass enabling clockgating for hardware IPs.
  * The list of all the hardware IPs that make up the asic is walked and the
- * set_clockgating_state callbacks are run.  This stage is run late
- * in the init process.
+ * set_clockgating_state callbacks are run.
+ * Late initialization pass enabling clockgating for hardware IPs.
+ * Fini or suspend, pass disabling clockgating for hardware IPs.
  * Returns 0 on success, negative error code on failure.
  */
-static int amdgpu_device_ip_late_set_cg_state(struct amdgpu_device *adev)
+static int amdgpu_device_set_cg_state(struct amdgpu_device *adev,
+						enum amd_clockgating_state state)
 {
-	int i = 0, r;
+	int i, j, r;
 
 	if (amdgpu_emu_mode == 1)
 		return 0;
 
-	for (i = 0; i < adev->num_ip_blocks; i++) {
+	for (j = 0; j < adev->num_ip_blocks; j++) {
+		i = state == AMD_CG_STATE_GATE ? j : adev->num_ip_blocks - j - 1;
 		if (!adev->ip_blocks[i].status.valid)
 			continue;
 		/* skip CG for VCE/UVD, it's handled specially */
@@ -1717,7 +1719,7 @@ static int amdgpu_device_ip_late_set_cg_state(struct amdgpu_device *adev)
 		    adev->ip_blocks[i].version->funcs->set_clockgating_state) {
 			/* enable clockgating to save power */
 			r = adev->ip_blocks[i].version->funcs->set_clockgating_state((void *)adev,
-										     AMD_CG_STATE_GATE);
+										     state);
 			if (r) {
 				DRM_ERROR("set_clockgating_state(gate) of IP block <%s> failed %d\n",
 					  adev->ip_blocks[i].version->funcs->name, r);
@@ -1729,14 +1731,15 @@ static int amdgpu_device_ip_late_set_cg_state(struct amdgpu_device *adev)
 	return 0;
 }
 
-static int amdgpu_device_ip_late_set_pg_state(struct amdgpu_device *adev)
+static int amdgpu_device_set_pg_state(struct amdgpu_device *adev, enum amd_powergating_state state)
 {
-	int i = 0, r;
+	int i, j, r;
 
 	if (amdgpu_emu_mode == 1)
 		return 0;
 
-	for (i = 0; i < adev->num_ip_blocks; i++) {
+	for (j = 0; j < adev->num_ip_blocks; j++) {
+		i = state == AMD_PG_STATE_GATE ? j : adev->num_ip_blocks - j - 1;
 		if (!adev->ip_blocks[i].status.valid)
 			continue;
 		/* skip CG for VCE/UVD, it's handled specially */
@@ -1746,7 +1749,7 @@ static int amdgpu_device_ip_late_set_pg_state(struct amdgpu_device *adev)
 		    adev->ip_blocks[i].version->funcs->set_powergating_state) {
 			/* enable powergating to save power */
 			r = adev->ip_blocks[i].version->funcs->set_powergating_state((void *)adev,
-										     AMD_PG_STATE_GATE);
+											state);
 			if (r) {
 				DRM_ERROR("set_powergating_state(gate) of IP block <%s> failed %d\n",
 					  adev->ip_blocks[i].version->funcs->name, r);
@@ -1787,8 +1790,8 @@ static int amdgpu_device_ip_late_init(struct amdgpu_device *adev)
 		}
 	}
 
-	amdgpu_device_ip_late_set_cg_state(adev);
-	amdgpu_device_ip_late_set_pg_state(adev);
+	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_GATE);
+	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_GATE);
 
 	queue_delayed_work(system_wq, &adev->late_init_work,
 			   msecs_to_jiffies(AMDGPU_RESUME_MS));
@@ -1906,13 +1909,9 @@ static int amdgpu_device_ip_fini(struct amdgpu_device *adev)
 }
 
 /**
- * amdgpu_device_ip_late_init_func_handler - work handler for clockgating
- *
- * @work: work_struct
+ * amdgpu_device_ip_late_init_func_handler - work handler for ib test
  *
- * Work handler for amdgpu_device_ip_late_set_cg_state.  We put the
- * clockgating setup into a worker thread to speed up driver init and
- * resume from suspend.
+ * @work: work_struct.
  */
 static void amdgpu_device_ip_late_init_func_handler(struct work_struct *work)
 {