Re: [PATCH v3] PCI: Reprogram bridge prefetch registers on resume

[Thomas Martitz]

Am 02.10.18 um 22:03 schrieb Bjorn Helgaas:
> Hi Thomas,
>
> On Mon, Oct 01, 2018 at 04:25:06PM +0200, Thomas Martitz wrote:
> > Am 01.10.18 um 06:57 schrieb Daniel Drake:
> > > On Sun, Sep 30, 2018 at 5:07 AM Thomas Martitz <kugel@xxxxxxxxxxx> wrote:
> > > > The latest iteration does not work on my HP system. The GPU fails to
> > > > power up just like the unpatched kernel.
> > >
> > > That's weird, I would not expect a behaviour change in the latest
> > > patch. pci_restore_config_dword() has some debug messages, could you
> > > please make them visible and show logs again?
> > > Also remind us of the PCI device address of the parent bridge (lspci -vt)
> >
> > I'll follow up with more the requested information on bugzilla
> > (Link: https://bugzilla.kernel.org/show_bug.cgi?id=201069).
> >
> > On a quick re-check, it seems to depend on if I used the eGPU before
> > the initial suspend. If I run glxgears (with DRI_PRIME=1) before suspend it
> > seems fine.
>
> Does the patch ([1]) make things *worse* compared to v4.19-rc5?

No, certainly not. It does look like a different issue since resuming now
works at least if I used the eGPU in some way before suspend 
(DRI_PRIME=1 glxgears seems to be enough, I assume glxinfo would work as 
well).

Without the patch resuming the eGPU does not work whatsoever.

Please ship the patch. I'll hopefully sort this other issue out.

Best regards.