diff options
| author | Steffen Trumtrar <s.trumtrar@pengutronix.de> | 2013-01-30 14:16:00 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-02-28 05:38:38 -0800 |
| commit | 4622b3b7c0269bd2da531ea5949cadff98522da9 (patch) | |
| tree | 5987626dc0486bf9f1daa98cc7e6960fbaeb9e59 | |
| parent | 62c97eb5d650caec370f856d721ddacb1bcb3ab6 (diff) | |
ARM: i.MX25: clk: parent per5_clk to AHB clock
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@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/arm/mach-imx/clk-imx25.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/clk-imx25.c b/arch/arm/mach-imx/clk-imx25.c index 2c570cdaae7..69858c78f40 100644 --- 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(unsigned long osc_rate) 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"); |