> On Oct 18, 2019, at 16:18, Takashi Iwai <[email protected]> wrote:
>
> On Fri, 18 Oct 2019 09:38:47 +0200,
> Kai-Heng Feng wrote:
>>
>> A driver may want to know the existence of _PR3, to choose different
>> runtime suspend behavior. A user will be add in next patch.
>>
>> This is mostly the same as nouveau_pr3_present().
>>
>> Reported-by: kbuild test robot <[email protected]>
>
> It's confusing -- this particular change isn't reported by the test
> bot, but only about the lack of the CONFIG_ACPI ifdef.
Hmm, because the test bot asked to add the tag.
If it's not appropriate will you drop it? I can also send a v7.
Kai-Heng
>
>
> thanks,
>
> Takashi
>
>> Signed-off-by: Kai-Heng Feng <[email protected]>
>> ---
>> v6:
>> - Only define the function when CONFIG_ACPI is set.
>> v5:
>> - Add wording suggestion from Bjorn.
>> v4:
>> - Let caller to find its upstream port device.
>>
>> drivers/pci/pci.c | 18 ++++++++++++++++++
>> include/linux/pci.h | 2 ++
>> 2 files changed, 20 insertions(+)
>>
>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
>> index e7982af9a5d8..1df99d9e350e 100644
>> --- a/drivers/pci/pci.c
>> +++ b/drivers/pci/pci.c
>> @@ -5856,6 +5856,24 @@ int pci_set_vga_state(struct pci_dev *dev, bool
>> decode,
>> return 0;
>> }
>>
>> +#ifdef CONFIG_ACPI
>> +bool pci_pr3_present(struct pci_dev *pdev)
>> +{
>> + struct acpi_device *adev;
>> +
>> + if (acpi_disabled)
>> + return false;
>> +
>> + adev = ACPI_COMPANION(&pdev->dev);
>> + if (!adev)
>> + return false;
>> +
>> + return adev->power.flags.power_resources &&
>> + acpi_has_method(adev->handle, "_PR3");
>> +}
>> +EXPORT_SYMBOL_GPL(pci_pr3_present);
>> +#endif
>> +
>> /**
>> * pci_add_dma_alias - Add a DMA devfn alias for a device
>> * @dev: the PCI device for which alias is added
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index f9088c89a534..1d15c5d49cdd 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -2310,9 +2310,11 @@ struct irq_domain
>> *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus);
>>
>> void
>> pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device
>> *));
>> +bool pci_pr3_present(struct pci_dev *pdev);
>> #else
>> static inline struct irq_domain *
>> pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; }
>> +static bool pci_pr3_present(struct pci_dev *pdev) { return false; }
>> #endif
>>
>> #ifdef CONFIG_EEH
>> --
>> 2.17.1
>>
