drm/amd/powerplay: add check before i2c_add_adapter

smu_i2c_eeprom_init may be invoked twice or more
under sroiv mode, while we don't want to add check
if (!amdgpu_sriov_vf) before we invoke smu_i2c_eeprom_init/fini
each time, so we check if i2c adapter is already added
before we invoke i2c_add_adapter
Signed-off-by: Wenhui Sheng <Wenhui.Sheng@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/amdgpu_smu.c

@@ -1350,11 +1350,9 @@ static int smu_hw_init(void *handle)
 	if (ret)
 		goto failed;
 
-	if (!amdgpu_sriov_vf(adev)) {
-		ret = smu_i2c_eeprom_init(smu, &adev->pm.smu_i2c);
-		if (ret)
-			goto failed;
-	}
+	ret = smu_i2c_eeprom_init(smu, &adev->pm.smu_i2c);
+	if (ret)
+		goto failed;
 
 	adev->pm.dpm_enabled = true;
 
@@ -1392,9 +1390,7 @@ static int smu_hw_fini(void *handle)
 
 	adev->pm.dpm_enabled = false;
 
-	if (!amdgpu_sriov_vf(adev)) {
-		smu_i2c_eeprom_fini(smu, &adev->pm.smu_i2c);
-	}
+	smu_i2c_eeprom_fini(smu, &adev->pm.smu_i2c);
 
 	ret = smu_stop_thermal_control(smu);
 	if (ret) {
@@ -1535,9 +1531,7 @@ static int smu_suspend(void *handle)
 
 	adev->pm.dpm_enabled = false;
 
-	if (!amdgpu_sriov_vf(adev)) {
-		smu_i2c_eeprom_fini(smu, &adev->pm.smu_i2c);
-	}
+	smu_i2c_eeprom_fini(smu, &adev->pm.smu_i2c);
 
 	ret = smu_disable_dpm(smu);
 	if (ret)
@@ -1582,11 +1576,9 @@ static int smu_resume(void *handle)
 	if (ret)
 		goto failed;
 
-	if (!amdgpu_sriov_vf(adev)) {
-		ret = smu_i2c_eeprom_init(smu, &adev->pm.smu_i2c);
-		if (ret)
-			goto failed;
-	}
+	ret = smu_i2c_eeprom_init(smu, &adev->pm.smu_i2c);
+	if (ret)
+		goto failed;
 
 	if (smu->is_apu)
 		smu_set_gfx_cgpg(&adev->smu, true);

drivers/gpu/drm/amd/powerplay/arcturus_ppt.c

@@ -2223,11 +2223,22 @@ static const struct i2c_algorithm arcturus_i2c_eeprom_i2c_algo = {
 	.functionality = arcturus_i2c_eeprom_i2c_func,
 };
 
+static bool arcturus_i2c_adapter_is_added(struct i2c_adapter *control)
+{
+	struct amdgpu_device *adev = to_amdgpu_device(control);
+
+	return control->dev.parent == &adev->pdev->dev;
+}
+
 static int arcturus_i2c_eeprom_control_init(struct i2c_adapter *control)
 {
 	struct amdgpu_device *adev = to_amdgpu_device(control);
 	int res;
 
+	/* smu_i2c_eeprom_init may be called twice in sriov */
+	if (arcturus_i2c_adapter_is_added(control))
+		return 0;
+
 	control->owner = THIS_MODULE;
 	control->class = I2C_CLASS_SPD;
 	control->dev.parent = &adev->pdev->dev;
@@ -2243,6 +2254,9 @@ static int arcturus_i2c_eeprom_control_init(struct i2c_adapter *control)
 
 static void arcturus_i2c_eeprom_control_fini(struct i2c_adapter *control)
 {
+	if (!arcturus_i2c_adapter_is_added(control))
+		return;
+
 	i2c_del_adapter(control);
 }