linux-kernel - Re: [PATCH] thunderbolt: Prevent root port runtime suspend during NVM upgrade

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Date:   Thu, 15 Nov 2018 12:35:49 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lukas Wunner <lukas@...ner.de>, Mario.Limonciello@...l.com,
        Anthony Wong <anthony.wong@...onical.com>
Subject: Re: [PATCH] thunderbolt: Prevent root port runtime suspend during
 NVM upgrade

On Wed, Nov 07, 2018 at 02:17:14PM +0300, Mika Westerberg wrote:
> During NVM upgrade process the host router is hot-removed for a short
> while. During this time it is possible that the root port is moved into
> D3cold which would be fine if the root port could trigger PME on itself.
> However, many systems actually do not implement it so what happens is
> that the root port goes into D3cold and never wakes up unless userspace
> does PCI config space access, such as running 'lscpi'.
> 
> For this reason we explicitly prevent the root port from runtime
> suspending during NVM upgrade.
> 
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Applied to thunderbolt.git/fixes.