>>> +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