Re: [PATCH 1/1] PCI: X-Gene: Disable Configuration Request Retry Status for X-Gene v1 PCIe

Ian Campbell
2015-06-12T10:51:59Z

On Thu, 2015-06-11 at 13:08 -0700, Duc Dang wrote:
> X-Gene v1 PCIe controller has a bug in Configuration Request Retry
> Status (CRS) logic:
> When CPU tries to read Vendor ID and Device ID of not-existed
> remote device, the controller returns 0xFFFF0001 instead of
> 0xFFFFFFFF; this will add significant delay in boot time as
> pci_bus_read_dev_vendor_id will wait for 60 seconds before
> giving up.
>
> So for X-Gene v1 PCIe controllers, disable CRS capability
> advertisement by clearing CRS Software Visibility bit before
> returning the Root Capability value to the callers. This is done
> by implementing X-Gene PCIe specific xgene_pcie_config_read32 for
> CFG read accesses to replace the generic default pci_generic_config_read32
> function.
>
> Signed-off-by: Duc Dang <dhdang@apm.com>

Applied onto v4.1-rc7 and:
Tested-by: Ian Campbell <ian.campbell@citrix.com>

Thanks!