From: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Date: Sat, 25 Apr 2015 17:52:37 +0000 (+0200)
Subject: libata: Ignore spurious PHY event on LPM policy change
X-Git-Tag: v3.2.70~112
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6d2cf32d106b396d29fd43a80fb6764535f7a1a3;p=pandora-kernel.git

libata: Ignore spurious PHY event on LPM policy change

commit 09c5b4803a80a5451d950d6a539d2eb311dc0fb1 upstream.

When the LPM policy is set to ATA_LPM_MAX_POWER, the device might
generate a spurious PHY event that cuases errors on the link.
Ignore this event if it occured within 10s after the policy change.

The timeout was chosen observing that on a Dell XPS13 9333 these
spurious events can occur up to roughly 6s after the policy change.

Link: http://lkml.kernel.org/g/3352987.ugV1Ipy7Z5@xps13
Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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