On 23/05/23 19:59, Pierre-Louis Bossart wrote:
>>>> +static int get_acp63_device_config(u32 config, struct pci_dev *pci, struct acp63_dev_data *acp_data)
>>>> {
>>>> struct acpi_device *dmic_dev;
>>>> + struct acpi_device *sdw_dev;
>>>> const union acpi_object *obj;
>>>> bool is_dmic_dev = false;
>>> useless init
>> We are checking is_dmic_dev & is_sdw_dev flags in same code.
>> Either we need to explicitly update value as false when no ACP PDM
>> /SoundWire manager instances not found.
> please discard my comment, I read this sideways
>
>>>> + bool is_sdw_dev = false;
>>> and useless init as well...
> same here.
>>>> + int ret;
>>>>
>>>> dmic_dev = acpi_find_child_device(ACPI_COMPANION(&pci->dev), ACP63_DMIC_ADDR, 0);
>>>> if (dmic_dev) {
>>>> + /* is_dmic_dev flag will be set when ACP PDM controller device exists */
>>>> if (!acpi_dev_get_property(dmic_dev, "acp-audio-device-type",
>>>> ACPI_TYPE_INTEGER, &obj) &&
>>>> obj->integer.value == ACP_DMIC_DEV)
>>>> is_dmic_dev = true;
>>>> }
>>>>
>>>> + sdw_dev = acpi_find_child_device(ACPI_COMPANION(&pci->dev), ACP63_SDW_ADDR, 0);
>>>> + if (sdw_dev) {
>>>> + acp_data->sdw_fw_node = acpi_fwnode_handle(sdw_dev);
>>>> + ret = sdw_amd_scan_controller(&pci->dev);
>>>> + /* is_sdw_dev flag will be set when SoundWire Manager device exists */
>>>> + if (!ret)
>>>> + is_sdw_dev = true;
>>> sdw_amd_scan_controller() can return -EINVAL, how is this handled?
>>> Shouldn't you stop execution and return here in the < 0 case?
>> As per our design, ACP PCI driver probe should be successful, even
>> there are no ACP PDM or Soundwire Manager instance configuration
>> related platform devices.
>>
>> The ACP PCI driver is multi-use and that even if SoundWire manager
>> instances or PDM controller is not found, it will still be used to set the
>> hardware to proper low power states. i.e ACP should enter D3 state
>> after successful execution of probe sequence.
> Ah ok, maybe a reworded comment would make sense then, e.g.
>
> "continue probe and discard errors if SoundWire Manager is not described
> in ACPI tables"
>
> Same for DMIC above
will add a comment.
