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

Ian Campbell ian.campbell at citrix.com
Fri Jun 12 03:51:54 PDT 2015

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 at apm.com>

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


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