Re: [PATCH V2 1/9] ASoC: amd: ps: create platform devices based on acp config

Pierre-Louis Bossart
2023-05-23T18:24:39Z

>>> +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