Re: Regression: 442ec4c04d1: PCI: dwc: all: Split struct pcie_port into host-only and core structures

Peter Senna Tschudin
2017-05-10T14:14:15Z

On Wed, May 10, 2017 at 03:32:19PM +0200, Lucas Stach wrote:
> Am Mittwoch, den 10.05.2017, 10:27 -0300 schrieb Fabio Estevam:
> > On Wed, May 10, 2017 at 10:17 AM, Peter Senna Tschudin
> > <peter.senna@collabora.com> wrote:
> > > On Tue, May 09, 2017 at 07:21:24AM -0300, Fabio Estevam wrote:
> > >> Hi Peter,
> > >>
> > >> On Tue, May 9, 2017 at 3:34 AM, Peter Senna Tschudin
> > >> <peter.senna@collabora.com> wrote:
> > >>
> > >> > Something that ocurred to me is that u-boot is initializing the PCI, and
> > >> > the PCI networkd cards. Ideally this should not affect anything, but
> > >> > can this be related to the issue?
> > >>
> > >> Yes, in order to narrow things down: please boot 4.11 without PCI
> > >> support in U-Boot.
> > >
> > > Yes, removing the PCI code from u-boot makes 4.11 to boot. But latest
> > > next still hangs.
> >
> > Ok, good. At least we see the same behaviour now.
> >
> > We still need a fix for the mx6q hang on systems with PCI switch for
> > linux/next or 4.12-rc1.
>
> I will take a look at this today.

I'll be more than happy to help. Let me know if you need testing or any
other thing.

>
> >
> > >> The problem is that mx6q does not have a way to properly reset the PCI block.
> > >>
> > >> On the board I tested there is no PCI support in U-Boot.
> > >>
> > >> Maybe we need the following approach in U-Boot as Lucas did for Barebox:
> > >> https://git.pengutronix.de/cgit/barebox/commit/?id=f1da98da2760c21487bbba8f7fb957c843a22896
> > >
> > > Maybe we do need, but the kernel is working on v4.10 for our use case,
> > > and it is not working any longer on v4.11. What is the way to continue
> > > from here?
> >
> > There is no other way other than fixing U-Boot on this case.
>
> You could also revert the change in the kernel if you are absolutely
> sure that this won't cause issues on your system (you are not using the
> internal watchdog etc.).
>
> But for the long run and to make sure that _all_ use-cases work
> properly, there is no way around fixing your bootloader to behave
> correctly.

Thanks!

>
> Regards,
> Lucas
>