PROBLEM: pcie imx6 link problem after a random number of reboot

[Ivan Grimaldi]

Hi,

 yes the hang is after "bridge, pass 1 pci_bus 0000:01: scanning bus";
I haven't a pcie analyzer.

IVan

2016-07-20 10:51 GMT+02:00 Richard Zhu <hongxing.zhu at nxp.com>:
> Hi Ivan:
> Sorry to reply late.
>
>> -----Original Message-----
>> From: Ivan Grimaldi [mailto:grimaldi.ivan at gmail.com]
>> Sent: Monday, July 18, 2016 6:45 PM
>> To: Richard Zhu <hongxing.zhu at nxp.com>
>> Cc: r65037 at freescale.com; l.stach at pengutronix.de; linux-pci at vger.kernel.org;
>> bhelgaas at google.com; linux-arm-kernel at lists.infradead.org
>> Subject: Re: PROBLEM: pcie imx6 link problem after a random number of
>> reboot
>>
>> Hi,
>>
>>   i have enabled early printk and after a random number of restart the kernel
>> hangs occurs later in the log (Below kernel log).
>>
>> ...
>> imx6q-pcie 1ffc000.pcie: Link up, Gen=2
>> imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00 pci_bus 0000:00: root
>> bus resource [io  0x1000-0xffff] pci_bus 0000:00: root bus resource [mem
>> 0x01000000-0x01efffff] pci_bus 0000:00: root bus resource [bus 00-ff] pci_bus
>> 0000:00: scanning bus pci 0000:00:00.0: [16c3:abcd] type 01 class 0x060400 pci
>> 0000:00:00.0: reg 0x10: [mem 0x00000000-0x000fffff] pci 0000:00:00.0: reg
>> 0x38: [mem 0x00000000-0x0000ffff pref] pci 0000:00:00.0: calling
>> pci_fixup_ide_bases+0x0/0x4c pci 0000:00:00.0: supports D1 pci 0000:00:00.0:
>> PME# supported from D0 D1 D3hot D3cold pci 0000:00:00.0: PME# disabled
>> pci_bus 0000:00: fixups for bus
>> PCI: bus0: Fast back to back transfers disabled pci 0000:00:00.0: scanning [bus
>> 01-01] behind bridge, pass 0 pci 0000:00:00.0: scanning [bus 00-00] behind
>> bridge, pass 1 pci_bus 0000:01: scanning bus
>>
>>
> [Zhu hongxing] The pcie link is up refer to the log.
> Is it hang here?
>
> If yes, I suspect that the link is not stable, and the link is down here.
> Can you use one pcie protocol analyzer to figure out what happen on the bus?
>
>>
>> IVan
>>
>>
> <snip...>
>
> Best Regards
> hongxing zhu
> Linux BSP team
> Office: 86-21-28937189
> Email: hongxing.zhu at nxp.com
>