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

From: Mika Westerberg
Date: Mon Oct 21 2019 - 07:40:25 EST

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@xxxxxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Lyude Paul <lyude@xxxxxxxxxx>
> Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
> Cc: Mika Westerberg <mika.westerberg@xxxxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx
> Cc: linux-pm@xxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: nouveau@xxxxxxxxxxxxxxxxxxxxx
> ---
> 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?