linux-kernel - Re: nouveau regression with 5.7 caused by "PCI/PM: Assume ports without DLL Link Active train links in 100 ms"

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Message-ID: <20200717195209.vmtyfmgweoo645lh@wunner.de>
Date:   Fri, 17 Jul 2020 21:52:09 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Lyude Paul <lyude@...hat.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Karol Herbst <kherbst@...hat.com>,
        Sasha Levin <sashal@...nel.org>,
        Patrick Volkerding <volkerdi@...il.com>,
        Linux PCI <linux-pci@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        nouveau <nouveau@...ts.freedesktop.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: nouveau regression with 5.7 caused by "PCI/PM: Assume ports
 without DLL Link Active train links in 100 ms"

On Fri, Jul 17, 2020 at 03:04:10PM -0400, Lyude Paul wrote:
> Isn't it possible to tell whether a PCI device is connected through
> thunderbolt or not? We could probably get away with just defaulting
> to 100ms for thunderbolt devices without DLL Link Active specified,
> and then default to the old delay value for non-thunderbolt devices.

pci_is_thunderbolt_attached()