From: Wang Zhi <zhi.wang@windriver.com>
Date: Wed, 17 Aug 2011 02:39:31 +0000 (+0800)
Subject: USB: EHCI: Do not rely on PORT_SUSPEND to stop USB resuming in ehci_bus_resume().
X-Git-Tag: v3.1-rc4~5^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0f2fb2500b1c5fe4967eb45d8c9bc758d7aef80;p=pandora-kernel.git

USB: EHCI: Do not rely on PORT_SUSPEND to stop USB resuming in ehci_bus_resume().

From EHCI Spec p.28 HC should clear PORT_SUSPEND when SW clears
PORT_RESUME. In Intel Oaktrail platform, MPH (Multi-Port Host
Controller) core clears PORT_SUSPEND directly when SW sets PORT_RESUME
bit. If we rely on PORT_SUSPEND bit to stop USB resume, we will miss
the action of clearing PORT_RESUME. This will cause unexpected long
resume signal on USB bus.

Signed-off-by: Wang Zhi <zhi.wang@windriver.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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