From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wolfram Sang <wsa@the-dreams.de>
Subject: Re: [PATCH] PCI: Freeze PME scan before suspending devices
Date: Wed, 19 Apr 2017 09:22:16 +0200
Message-ID: <20170419072216.2chcdfpl6dxfgxgs@ninjato>
References: <03aaf3220cccbabb7db86aa4eb10d1147add5c34.1492536769.git.lukas@wunner.de>
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Sender: linux-pci-owner@vger.kernel.org
To: Lukas Wunner <lukas@wunner.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>, Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>, Geert Uytterhoeven <geert+renesas@glider.be>, "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>, Mika Westerberg <mika.westerberg@linux.intel.com>, Niklas Soderlund <niklas.soderlund+renesas@ragnatech.se>, Simon Horman <horms+renesas@verge.net.au>, Yinghai Lu <yinghai@kernel.org>, Matthew Garrett <mjg59@srcf.ucam.org>, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-renesas-soc@vger.kernel.org
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On Tue, Apr 18, 2017 at 08:44:30PM +0200, Lukas Wunner wrote:
> Laurent Pinchart reported that the Renesas R-Car H2 Lager board
> (r8a7790) crashes during suspend tests.  Geert Uytterhoeven managed to
> reproduce the issue on an M2-W Koelsch board (r8a7791):
>=20
> It occurs when the PME scan runs, once per second.  During PME scan, the
> PCI host bridge (rcar-pci) registers are accessed while its module clock
> has already been disabled, leading to the crash.

Cool! I stumbled over this while testing I2C suspend behaviour the last
days, and I can confirm that the crash is gone with this patch on my
Lager board. Thanks!

Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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