drm/amd/powerplay: optimize i2c bus access implementation

The caller needs not care about the internal details how the powerplay
API implemented.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1247,3 +1247,18 @@ int amdgpu_dpm_set_clockgating_by_smu(struct amdgpu_device *adev,
 
 	return ret;
 }
+
+int amdgpu_dpm_smu_i2c_bus_access(struct amdgpu_device *adev,
+				  bool acquire)
+{
+	void *pp_handle = adev->powerplay.pp_handle;
+	const struct amd_pm_funcs *pp_funcs =
+			adev->powerplay.pp_funcs;
+	int ret = -EOPNOTSUPP;
+
+	if (pp_funcs && pp_funcs->smu_i2c_bus_access)
+		ret = pp_funcs->smu_i2c_bus_access(pp_handle,
+						   acquire);
+
+	return ret;
+}

drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h

@@ -545,4 +545,7 @@ int amdgpu_dpm_enable_mgpu_fan_boost(struct amdgpu_device *adev);
 int amdgpu_dpm_set_clockgating_by_smu(struct amdgpu_device *adev,
 				      uint32_t msg_id);
 
+int amdgpu_dpm_smu_i2c_bus_access(struct amdgpu_device *adev,
+				  bool acquire);
+
 #endif

drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c

@@ -508,14 +508,9 @@ static bool smu_v11_0_i2c_bus_lock(struct i2c_adapter *control)
 	struct amdgpu_device *adev = to_amdgpu_device(control);
 
 	/* Send  PPSMC_MSG_RequestI2CBus */
-	if (!adev->powerplay.pp_funcs->smu_i2c_bus_access)
-		goto Fail;
-
-
-	if (!adev->powerplay.pp_funcs->smu_i2c_bus_access(adev->powerplay.pp_handle, true))
+	if (!amdgpu_dpm_smu_i2c_bus_access(adev, true))
 		return true;
 
-Fail:
 	return false;
 }
 
@@ -523,16 +518,10 @@ static bool smu_v11_0_i2c_bus_unlock(struct i2c_adapter *control)
 {
 	struct amdgpu_device *adev = to_amdgpu_device(control);
 
-	/* Send  PPSMC_MSG_RequestI2CBus */
-	if (!adev->powerplay.pp_funcs->smu_i2c_bus_access)
-		goto Fail;
-
 	/* Send  PPSMC_MSG_ReleaseI2CBus */
-	if (!adev->powerplay.pp_funcs->smu_i2c_bus_access(adev->powerplay.pp_handle,
-							     false))
+	if (!amdgpu_dpm_smu_i2c_bus_access(adev, false))
 		return true;
 
-Fail:
 	return false;
 }