From: Jarkko Nikula <jarkko.nikula@bitmer.com>
To: Kevin Hilman <khilman@ti.com>
Cc: javier Martin <javier.martin@vista-silicon.com>,
linux-omap@vger.kernel.org, Koen Kooi <koen@beagleboard.org>
Subject: Re: cpuidle status in mainline for Beagleboard xM
Date: Fri, 02 Sep 2011 09:05:53 +0300 [thread overview]
Message-ID: <4E607241.8000704@bitmer.com> (raw)
In-Reply-To: <87ei00f94i.fsf@ti.com>
On 09/01/2011 08:46 PM, Kevin Hilman wrote:
> javier Martin<javier.martin@vista-silicon.com> writes:
>
>> Hi Kevin,
>> thanks for your help.
>>
>>> CPU is staying in C0 probably because UARTs are not being idled, so SoC
>>> cannot hit deeper idle states. Try the following at the command line to
>>> to enable UART idle timeouts, so the SoC can attempt idle after the
>>> timeout period
>>>
>>> # UART timeouts: omap-serial (4th UART only on OMAP36xx and OMAP4)
>>> echo 5> /sys/devices/platform/omap/omap_uart.0/sleep_timeout
>>> echo 5> /sys/devices/platform/omap/omap_uart.1/sleep_timeout
>>> echo 5> /sys/devices/platform/omap/omap_uart.2/sleep_timeout
>>> echo 5> /sys/devices/platform/omap/omap_uart.3/sleep_timeout
>>>
>>> After 5 seconds of inactivity on the UARTs, you should see the SoC
>>> hitting deeper C-states.
>> I've tried that but it still doesn't hit any C-state deeper than 0.
>> I'll try the same test using your pm branch you pointed me out and
>> post the results.
>>
> The CPUidle stuff works in mainline (after allowing UARTs to idle).
Other usual things to check that display is off (echo 1 >
/sys/class/graphics/fb0/blank) and no cable to musb/otg port.
Haven't tried myself with recent kernel but does EHCI and hub on XM let
to idle cpu at all? At least on one board having on-board hub I had to
disable or unload ehci module in order to hit the retention.
--
Jarkko
next prev parent reply other threads:[~2011-09-02 6:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-01 14:14 cpuidle status in mainline for Beagleboard xM javier Martin
2011-09-01 15:10 ` Kevin Hilman
2011-09-01 15:33 ` javier Martin
2011-09-01 17:46 ` Kevin Hilman
2011-09-02 6:05 ` Jarkko Nikula [this message]
2011-09-02 7:23 ` javier Martin
2011-09-02 17:14 ` Kevin Hilman
2011-09-05 8:04 ` javier Martin
2011-09-06 21:04 ` Kevin Hilman
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