From: Dave Martin <dave.martin@linaro.org>
Date: Tue, 24 May 2011 11:11:48 +0000 (+0100)
Subject: ARM: 6940/1: fiq: Briefly document driver responsibilities for suspend/resume
X-Git-Tag: v3.0-rc1~34^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2846d84ffa4408c9810fabad74cb7aec410352fc;p=pandora-kernel.git

ARM: 6940/1: fiq: Briefly document driver responsibilities for suspend/resume

Drivers which make use of the FIQ interrupt may require the state
of the FIQ mode registers to be preserved across suspend/resume.

Because the FIQ mode registers are not saved and restored
automatically by the kernel, driver authors will need to do the
appropriate save/restore in their own driver suspend/resume
handlers.

Implementing global automatic save/restore of the FIQ state does
not appear appropriate, since this by itself is not sufficient for
FIQ-based drivers to function correctly across suspend/resume in
any case.

This patch adds a brief explanatory note to fiq.h documenting the
requirement placed on driver authors.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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