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

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Message-ID: <20191021114017.GY2819@lahna.fi.intel.com>
Date:   Mon, 21 Oct 2019 14:40:17 +0300
From:   Mika Westerberg <mika.westerberg@...el.com>
To:     Karol Herbst <kherbst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Lyude Paul <lyude@...hat.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        linux-pci@...r.kernel.org, linux-pm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org
Subject: Re: [PATCH v3] pci: prevent putting nvidia GPUs into lower device
 states on certain intel bridges

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?