This is a note to let you know that I've just added the patch titled
ARM: i.MX25: clk: parent per5_clk to AHB clock
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-i.mx25-clk-parent-per5_clk-to-ahb-clock.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4b526ca5f627188425184a22ed46c91baa602d43 Mon Sep 17 00:00:00 2001
From: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
Date: Wed, 30 Jan 2013 14:16:00 +0100
Subject: ARM: i.MX25: clk: parent per5_clk to AHB clock
From: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
commit 4b526ca5f627188425184a22ed46c91baa602d43 upstream.
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@xxxxxxxxxxxxxx>
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-imx/clk-imx25.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/arm/mach-imx/clk-imx25.c
+++ b/arch/arm/mach-imx/clk-imx25.c
@@ -224,6 +224,9 @@ static int __init __mx25_clocks_init(uns
clk_prepare_enable(clk[emi_ahb]);
+ /* Clock source for gpt must be derived from AHB */
+ clk_set_parent(clk[per5_sel], clk[ahb]);
+
clk_register_clkdev(clk[ipg], "ipg", "imx-gpt.0");
clk_register_clkdev(clk[gpt_ipg_per], "per", "imx-gpt.0");
Patches currently in stable-queue which might be from s.trumtrar@xxxxxxxxxxxxxx are
queue-3.8/arm-i.mx25-clk-parent-per5_clk-to-ahb-clock.patch
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