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

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Date:   Tue, 2 Oct 2018 15:03:50 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Thomas Martitz <kugel@...kbox.org>
Cc:     Daniel Drake <drake@...lessm.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>,
        nouveau@...ts.freedesktop.org, Linux PM <linux-pm@...r.kernel.org>,
        Peter Wu <peter@...ensteyn.nl>, kherbst@...hat.com,
        andy.shevchenko@...ux.intel.com,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Jon Derrick <jonathan.derrick@...el.com>,
        David Miller <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        netdev <netdev@...r.kernel.org>, nic_swsd@...ltek.com,
        rchang@...vell.com, Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] PCI: Reprogram bridge prefetch registers on resume

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@...kbox.org> 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?

If so, I'll drop the patch until we figure this out.  But if the GPU
power issue also occurs in v4.19-rc5, I think we can assume it's a
different problem and we can go ahead and merge [1].

[1] https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=for-linus&id=083874549fdfefa629dfa752785e20427dde1511