Re: [PATCH] gpio: omap: be more aggressive with pm_runtime

[Kevin Hilman <khilman@ti.com>]

Felipe Balbi <balbi@ti.com> writes:

> Hi,
>
> On Wed, Feb 08, 2012 at 03:26:54PM +0200, Felipe Balbi wrote:
>> try to keep gpio block suspended as much as possible.
>> 
>> Tested with pandaboard and a sysfs exported gpio.
>> 
>> Signed-off-by: Felipe Balbi <balbi@ti.com>
>> ---
>> 
>> I couldn't see any issues with this patch. I managed to export
>> a gpio and change the direction with a while true loop with
>> no issues whatsoever.
>
> btw, I also played with gpios 7 and 8 because they have LEDs on them on
> pandaboard and everything seems to be fine.
>
> I just want to be sure I can still go to OFF mode and wakeup, but on
> vanilla 3.3-rc2 after echo mem > /sys/power/state the systems freezes on
> panda, so I can't go any further.

I don't think it's frozen.  I suspected it's suspended without any
wakeups enabled.  You probably haven't enabled UART wakeups.  Try
enabling them like this:

  echo enabled > /sys/devices/platform/omap/omap_uart.2/tty/ttyO2/power/wakeup
 
before going into suspend.

Kevin