From: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
Date: Mon, 18 Oct 2010 21:35:54 +0000 (+0100)
Subject: ARM: 6454/1: sa1100: Fix for a nasty initialization bug in the RTSR.
X-Git-Tag: v2.6.38-rc1~471^2~5^7~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7decaa557a20f48aabef35f817ec16ef563567b0;p=pandora-kernel.git

ARM: 6454/1: sa1100: Fix for a nasty initialization bug in the RTSR.

This patch fixes a nasty initialization condition on the RTSR register.
Sometimes, bit 1 will wake up set, sometimes not. This can be seen
by checking the value of the RTSR by typing '$ cat /proc/driver/rtc',
which has been provided by the previous patch.

If this bit is set, the command '$ cat /dev/rtc0' will lock the system
in an endless interrupt routine calling loop.

This patch fixes the issue both at sa1100_rtc_probe(), where it avoids
a spurious interrupt from happening, and at sa1100_rtc_interrupt(),
which is the robust solution, though it does not avoid the first
spurious interrupt.

Signed-off-by: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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