[PATCH] PCI: imx6: fix downstream bus scanning

[Fabio Estevam]

On Wed, May 10, 2017 at 3:35 PM, Fabio Estevam <festevam at gmail.com> wrote:
> Hi Lucas,
>
> On Wed, May 10, 2017 at 2:57 PM, Lucas Stach <l.stach at pengutronix.de> wrote:
>> The change in Linux 4.12 to make PCI configuartion requests non-posted
>> means that we are now getting a synchronous abort when the CFG space
>> read to probe for downstream devices times out.
>>
>> Synchronous aborts need to be handled differently from the async aborts
>> we were getting before, in particular the PC needs to be advanced when
>> resolving the abort. This is mostly a copy of what other PCI drivers do
>> on ARM to handle those aborts.
>>
>> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
>> ---
>> This is a fix that needs to go in for 4.12, but I would hope to get
>> some thorough testing before.
>
> This fixes the kernel crash on my mx6q board with a PCI switch, thanks!
>
> PCI Wifi card is also correctly detected.

Forgot to add:

Tested-by: Fabio Estevam <fabio.estevam at nxp.com>