drm/amdgpu: refine vce_3.0 code.

fix logic error in hw_fini and
set_clockgating_state functions.
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vce_v3_0.c

@@ -65,7 +65,8 @@ static void vce_v3_0_mc_resume(struct amdgpu_device *adev, int idx);
 static void vce_v3_0_set_ring_funcs(struct amdgpu_device *adev);
 static void vce_v3_0_set_irq_funcs(struct amdgpu_device *adev);
 static int vce_v3_0_wait_for_idle(void *handle);
-
+static int vce_v3_0_set_clockgating_state(void *handle,
+					  enum amd_clockgating_state state);
 /**
  * vce_v3_0_ring_get_rptr - get read pointer
  *
@@ -305,12 +306,8 @@ static int vce_v3_0_stop(struct amdgpu_device *adev)
 		/* hold on ECPU */
 		WREG32_FIELD(VCE_SOFT_RESET, ECPU_SOFT_RESET, 1);
 
-		/* clear BUSY flag */
-		WREG32_FIELD(VCE_STATUS, JOB_BUSY, 0);
-
-		/* Set Clock-Gating off */
-		if (adev->cg_flags & AMD_CG_SUPPORT_VCE_MGCG)
-			vce_v3_0_set_vce_sw_clock_gating(adev, false);
+		/* clear VCE STATUS */
+		WREG32(mmVCE_STATUS, 0);
 	}
 
 	WREG32(mmGRBM_GFX_INDEX, mmGRBM_GFX_INDEX_DEFAULT);
@@ -461,7 +458,8 @@ static int vce_v3_0_hw_fini(void *handle)
 	if (r)
 		return r;
 
-	return vce_v3_0_stop(adev);
+	vce_v3_0_stop(adev);
+	return vce_v3_0_set_clockgating_state(adev, AMD_CG_STATE_GATE);
 }
 
 static int vce_v3_0_suspend(void *handle)
@@ -728,7 +726,7 @@ static int vce_v3_0_set_clockgating_state(void *handle,
 
 		WREG32(mmGRBM_GFX_INDEX, GET_VCE_INSTANCE(i));
 
-		if (enable) {
+		if (!enable) {
 			/* initialize VCE_CLOCK_GATING_A: Clock ON/OFF delay */
 			uint32_t data = RREG32(mmVCE_CLOCK_GATING_A);
 			data &= ~(0xf | 0xff0);