Re: PCIe current resource settings

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[+cc linux-acpi]

On Wed, Jun 25, 2014 at 4:23 AM, Jagan Teki <jagannadh.teki@xxxxxxxxx> wrote:
> Hi,
>
> I think CRS feature is all ready available in Linux [1]

Yes, but _CRS is an ACPI feature, and the actual connection of _CRS
information to the PCI core is currently done by arch-specific code
for x86 and ia64.  There is no corresponding support for ARM.

The x86 and ia64 support is in arch-specific functions called
probe_pci_root_info().  These are actually generic in principle, and I
would love it if this functionality could be moved into
acpi_pci_root_add() somehow.

> I'm guessing the respective root complex driver need to enable and use
> this feature.
> I'm using PCIe bridge which is operating in ARM, how can I enable or
> is there RC driver which uses this feature already?
>
> [1] http://lwn.net/Articles/373551/
>
> thanks!
> --
> Jagan.
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