linux-kernel - Re: [PATCH v3] pci: prevent putting nvidia GPUs into lower device states on certain intel bridges

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Message-ID: <CACO55tt2iGcySugTAb1khEYpiGoq6Os3upG5fGq+0PbE2gyyeQ@mail.gmail.com>
Date:   Mon, 21 Oct 2019 14:00:46 +0200
From:   Karol Herbst <kherbst@...hat.com>
To:     Mika Westerberg <mika.westerberg@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lyude Paul <lyude@...hat.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        nouveau <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH v3] pci: prevent putting nvidia GPUs into lower device
 states on certain intel bridges

On Mon, Oct 21, 2019 at 1:40 PM Mika Westerberg
<mika.westerberg@...el.com> wrote:
>
> Hi Karol,
>
> Sorry for commenting late, I just came back from vacation.
>
> On Wed, Oct 16, 2019 at 04:44:49PM +0200, Karol Herbst wrote:
> > Fixes state transitions of Nvidia Pascal GPUs from D3cold into higher device
> > states.
> >
> > v2: convert to pci_dev quirk
> >     put a proper technical explanation of the issue as a in-code comment
> > v3: disable it only for certain combinations of intel and nvidia hardware
> >
> > Signed-off-by: Karol Herbst <kherbst@...hat.com>
> > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > Cc: Lyude Paul <lyude@...hat.com>
> > Cc: Rafael J. Wysocki <rjw@...ysocki.net>
> > Cc: Mika Westerberg <mika.westerberg@...el.com>
> > Cc: linux-pci@...r.kernel.org
> > Cc: linux-pm@...r.kernel.org
> > Cc: dri-devel@...ts.freedesktop.org
> > Cc: nouveau@...ts.freedesktop.org
> > ---
> >  drivers/pci/pci.c    | 11 ++++++++++
> >  drivers/pci/quirks.c | 52 ++++++++++++++++++++++++++++++++++++++++++++
>
> I may be missing something but why you can't do this in the nouveau
> driver itself?

What do you mean precisely? Move the quirk into nouveau, but keep the
changes to pci core?