[PATCH v4] pinctrl: mediatek: Implement wake handler and suspend resume

[Daniel Kurtz]

Adding dtor & linux-input as we are now discussing the elan trackpad driver...

On Mon, Sep 14, 2015 at 7:16 PM, Sudeep Holla <sudeep.holla at arm.com> wrote:
>
>
> On 12/09/15 10:50, maoguang meng wrote:
>> hi Sudeep:
>>
>> I test flowlling your blow suggestions,but the system can not be woken.
>>
>> beacuse,mtk_eint_suspend will mask it.As we know if eint wakeup system
>> it must be unmasked before enter suspend flow.
>>
>> e.x
>>
>> static int __maybe_unused elan_suspend(struct device *dev)
>> {
>>       struct i2c_client *client = to_i2c_client(dev);
>>       struct elan_tp_data *data = i2c_get_clientdata(client);
>>       int ret;
>>
>>       /*
>>        * We are taking the mutex to make sure sysfs operations are
>>        * complete before we attempt to bring the device into low[er]
>>        * power mode.
>>        */
>>       ret = mutex_lock_interruptible(&data->sysfs_mutex);
>>       if (ret)
>>               return ret;
>>
>>       disable_irq(client->irq);
>>
>>       if (device_may_wakeup(dev)) {
>>               ret = elan_sleep(data);
>>               /* Enable wake from IRQ */
>>               data->irq_wake = (enable_irq_wake(client->irq) == 0);
>
> This is wrong assumption in the driver. enable_irq_wake doesn't
> implicitly enable the IRQ. So the disable_irq should be moved to else.
> And the resume patch also needs to be fixed accordingly, otherwise you
> may get unbalanced irq. But this should not be the reason for fixing the
> pinctrl suspend/resume.
>
> Regards,
> Sudeep
>
> --->8
>
> diff --git a/drivers/input/mouse/elan_i2c_core.c
> b/drivers/input/mouse/elan_i2c_core.c
> index fa945304b9a5..7de26b04f45c 100644
> --- a/drivers/input/mouse/elan_i2c_core.c
> +++ b/drivers/input/mouse/elan_i2c_core.c
> @@ -1117,13 +1117,13 @@ static int __maybe_unused elan_suspend(struct
> device *dev)
>         if (ret)
>                 return ret;
>
> -       disable_irq(client->irq);
> -
>         if (device_may_wakeup(dev)) {
>                 ret = elan_sleep(data);
>                 /* Enable wake from IRQ */
>                 data->irq_wake = (enable_irq_wake(client->irq) == 0);
>         } else {
> +               disable_irq(client->irq);
> +
>                 ret = elan_disable_power(data);
>         }