drm/amd/pm: Use devm_i2c_add_adapter() in the Sienna smu

The I2C init for Sienna Cichlid uses i2c_add_adapter() and
i2c_del_adapter(), this commit replaces the use of these two functions
with devm_i2c_add_adapter(). Notice that Sienna Cichlid init initializes
multiple I2C buses in a loop; if something goes wrong, the previous
adapters are removed, and the amdgpu load is interrupted. Since I2C init
is required for the correct load of amdgpu, it is safe to rely on
devm_i2c_add_adapter() to handle any previously initialized I2C adapter.

Signed-off-by: Rodrigo Siqueira <siqueira@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: rodrigosiqueira

drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c

@@ -2648,10 +2648,10 @@ static int sienna_cichlid_i2c_control_init(struct smu_context *smu)
 		control->quirks = &sienna_cichlid_i2c_control_quirks;
 		i2c_set_adapdata(control, smu_i2c);
 
-		res = i2c_add_adapter(control);
+		res = devm_i2c_add_adapter(adev->dev, control);
 		if (res) {
 			DRM_ERROR("Failed to register hw i2c, err: %d\n", res);
-			goto Out_err;
+			return res;
 		}
 	}
 	/* assign the buses used for the FRU EEPROM and RAS EEPROM */
@@ -2660,27 +2660,12 @@ static int sienna_cichlid_i2c_control_init(struct smu_context *smu)
 	adev->pm.fru_eeprom_i2c_bus = &adev->pm.smu_i2c[0].adapter;
 
 	return 0;
-Out_err:
-	for ( ; i >= 0; i--) {
-		struct amdgpu_smu_i2c_bus *smu_i2c = &adev->pm.smu_i2c[i];
-		struct i2c_adapter *control = &smu_i2c->adapter;
-
-		i2c_del_adapter(control);
-	}
-	return res;
 }
 
 static void sienna_cichlid_i2c_control_fini(struct smu_context *smu)
 {
 	struct amdgpu_device *adev = smu->adev;
-	int i;
 
-	for (i = 0; i < MAX_SMU_I2C_BUSES; i++) {
-		struct amdgpu_smu_i2c_bus *smu_i2c = &adev->pm.smu_i2c[i];
-		struct i2c_adapter *control = &smu_i2c->adapter;
-
-		i2c_del_adapter(control);
-	}
 	adev->pm.ras_eeprom_i2c_bus = NULL;
 	adev->pm.fru_eeprom_i2c_bus = NULL;
 }