From: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Date: Wed, 30 Jan 2013 13:16:00 +0000 (+0100)
Subject: ARM: i.MX25: clk: parent per5_clk to AHB clock
X-Git-Tag: v3.9-rc1~123^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b526ca5f627188425184a22ed46c91baa602d43;p=pandora-kernel.git

ARM: i.MX25: clk: parent per5_clk to AHB clock

The mxc-timer on the imx25 needs to be derived from the AHB clock.
If a bootloader reparents this clock to the ipg_clk_highfreq, which according
to the datasheet is a valid operation, the system can/will produce lockups/
freezes after some time [1].

This can be forced with code like
	while(1)
                syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);

This was already fixed with the commit
	"i.MX25 GPT clock fix: ensure correct the clock source" [2],
for 3.1-rc2, but was lost, when i.MX was converted to the common clock framework
("ARM i.MX25: implement clocks using common clock framework") [3]

[1]: http://lists.arm.linux.org.uk/lurker/message/20130129.161230.229bda17.en.html
[2]: 2012d9ca2a1381ae3e733330a7f0d1d2f1988bba
[3]: 6bbaec5676e4f475b0d78743cbd4c70a8804ce14

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Cc: stable@vger.kernel.org # v3.5+
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---

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