Re: BeagleBoard not resuming from uart with latest pm-core ?

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Hello,

On Wed, 10 Nov 2010 09:32:53 -0800
Kevin Hilman <khilman@deeprootsystems.com> wrote:

> The other problem that I'm aware of so far I've only seen on boards
> with UART2 console (beagle, Overo, n900.)  The printk messages that
> warn of 'new worst case [de]activate latency" seem to be racing with
> UART disable code.  This makes sense, since this printk is printed to
> the UART immediately after the UART is disabled, which is going to
> cause problems with the current approach to UART pm we have in
> mach-omap2/serial.c.   I have not yet fully debugged this and found a
> workaround. 

Even if I comment the "new worst case deactivate latency" message, my
BeagleBoard still doesn't wake-up from suspend. Here's what I do:

# echo enabled > /sys/class/tty/ttyO2/power/wakeup
# echo mem > /sys/power/state 
[  227.685028] PM: Syncing filesystems ... done.
[  227.699432] Freezing user space processes ... (elapsed 0.01 seconds) done.
[  227.725524] Freezing remaining freezable tasks ... (elapsed 0.02 seconds) done.
[  227.880706] PM: suspend of devices complete after 117.767 msecs
[  227.889160] PM: late suspend of devices complete after 2.136 msecs
[  227.895782] Disabling non-boot CPUs ...

Any idea ?

Thanks!

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com