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],
but it seems, that it got lost. So, re-add this to have a correct gpt.
[1]:
http://lists.arm.linux.org.uk/lurker/message/20130129.161230.229bda17.en.html
[2]: 2012d9ca2a1381ae3e733330a7f0d1d2f1988bba
Signed-off-by: Steffen Trumtrar <s.trumt...@pengutronix.de>
Cc: stable@vger.kernel.org
---
arch/arm/mach-imx/clk-imx25.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm/mach-imx/clk-imx25.c b/arch/arm/mach-imx/clk-imx25.c
index 5d34f67..0e6dde6 100644
--- a/arch/arm/mach-imx/clk-imx25.c
+++ b/arch/arm/mach-imx/clk-imx25.c
@@ -177,6 +177,9 @@ static int __init __mx25_clocks_init(unsigned long osc_rate)
pr_err("i.MX25 clk %d: register failed with %ld\n",
i, PTR_ERR(clk[i]));
+ /* 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");
--
1.7.10.4
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