Re: gpio-omap: wakeup mask

Hey Tony, all

On 04.07.2014 09:27, Tony Lindgren wrote:

* Pascal Huerst [off-list ref] [140702 05:12]:

quoted

Hi everyone,

we have a device with an am335x and are using some gpios on bank0 to
wake up the device from suspend to ram.

We have some user buttons which are configured in the devicetree as
gpio-keys and one power-key which should wake up the device:

&buttons {
        power {
                label = "Power";
                gpios = <&gpio0 6 1>;
                linux,code = <116>;
                gpio-key,wakeup;
        };

        one {
                label = "One";
                gpios = <&gpio0 11 1>;
                linux,code = <2>;
        };

        : : :
}

The problem is, that the device wakes up on any trigger on bank 0. No
matter which button was pressed. "gpio-key,wakeup" seems not to have any
influence.

Now, if I comment the following lines out in drivers/gpio/gpio-omap.c :
set_gpio_trigger(...).

321
322 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
323    _gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
324      bank->context.wake_en =
325        readl_relaxed(bank->base + bank->regs->wkup_en);
326 }
327

Everything works as expected. But I don't really understand why? Is this
a bug, or does this break something else I have not discovered yet?

The GPIO wake-up events are working from off-idle for omap3
the last time I checked, so sounds like this is some am335x
related issue.

Ok, that sounds reasonable.

What does your bank->context.wake_en mask get set to with this code?

by calling 'echo mem > /sys/power/state' followed by a wakeup, I get the
following:

[   28.738416] PM: Syncing filesystems ... done.
[   28.779153] Freezing user space processes ... (elapsed 0.003 seconds)
done.
[   28.790236] Freezing remaining freezable tasks ... (elapsed 0.002
seconds) done.
[   28.801386] PM: Sending message for entering DeepSleep mode
[   28.935412] bank->context->wake_en = 00080840
[   28.945935] PM: suspend of devices complete after 133.156 msecs
[   28.961008] PM: late suspend of devices complete after 8.834 msecs
[   28.978874] omap_hwmod: cpgmac0: _wait_target_disable failed
[   28.985940] PM: noirq suspend of devices complete after 18.324 msecs
[   28.992697] PM: GFX domain entered low power state
[   28.992697] PM: Could not transition all powerdomains to target state
[   28.992697] PM: Wakeup source GPIO0
[   28.992866] bank->context->wake_en = 00080040
[   29.020974] PM: noirq resume of devices complete after 22.439 msecs
[   29.028257] bank->context->wake_en = 00080040
[   29.032840] bank->context->wake_en = 00080840
[   29.039207] bank->context->wake_en = 00080840
[   29.043961] bank->context->wake_en = 0000F200
[   29.048534] bank->context->wake_en = 0000F200
[   29.053093] bank->context->wake_en = 0000F200
[   29.057704] bank->context->wake_en = 0000F200
[   29.062266] bank->context->wake_en = 0000F200
[   29.066992] bank->context->wake_en = 00060000
[   29.071554] bank->context->wake_en = 00060000
[   29.082499] PM: early resume of devices complete after 6.136 msecs
[   29.091048] net eth0: initializing cpsw version 1.12 (0)
[   29.173888] net eth0: phy found : id is : 0x4dd076
[   29.229388] mmc0: error -110 during resume (card was removed?)
[   29.235609] dpm_run_callback(): mmc_bus_resume+0x0/0x74 returns -110
[   29.242272] PM: Device mmc0:0001 failed to resume: error -110
[   29.293992] PM: resume of devices complete after 204.891 msecs
[   29.306801] PM: Sending message for resetting M3 state machine
[   29.313693] Restarting tasks ... done.

Thanks
Pascal