3.12: omap4: cpuidle: solid hangs at boot

3.12: omap4: cpuidle: solid hangs at boot

[Paolo Pisati]

Vanilla 3.12 multi_v7_defconfig + cpu_idle result in a solid hang on my pandaes
board: has anyone experienced it before? is cpu_idle safe on omap4?

same kernel boots fine on omap3 and some other arm boards fwiw.
if you want to reproduce it:

config: http://people.canonical.com/~ppisati/3.12_armv7multi_cpuidle/config

zImage: http://people.canonical.com/~ppisati/3.12_armv7multi_cpuidle/zImage

boot log: http://paste.ubuntu.com/6415293/
-- 
bye,
p.

Re: 3.12: omap4: cpuidle: solid hangs at boot

[Lokesh Vutla]

+ Kevin

Hi Paolo,

On Thursday 14 November 2013 04:34 PM, Paolo Pisati wrote:
> Vanilla 3.12 multi_v7_defconfig + cpu_idle result in a solid hang on my pandaes
> board: has anyone experienced it before? is cpu_idle safe on omap4?
I have also seen the same issue on my panda es board.
On further investigation, it seemed to work on 3.11 and broken between 3.12-rc1 and 3.12-rc2
because of the following patch: 
7835027 ARM: OMAP4: cpuidle: fix: call cpu_cluster_pm_exit conditionally
(http://www.mail-archive.com/linux-omap@vger.kernel.org/msg94655.html)

But by applying a recent patch from Grygorii Strashko https://patchwork.kernel.org/patch/3084521/ 
seems to make it work.
You can give a try by applying the given patch.

Kevin, please correct me if I am wrong.

Thanks and regards,
Lokesh
> 
> same kernel boots fine on omap3 and some other arm boards fwiw.
> if you want to reproduce it:
> 
> config: http://people.canonical.com/~ppisati/3.12_armv7multi_cpuidle/config
> 
> zImage: http://people.canonical.com/~ppisati/3.12_armv7multi_cpuidle/zImage
> 
> boot log: http://paste.ubuntu.com/6415293/
>