[PATCH V2 1/4] Input: pxa27x_keypad keep clock on as wakeup source

[Haojian Zhuang]

On Fri, Mar 30, 2012 at 9:58 AM, Chao Xie <chao.xie at marvell.com> wrote:
> When the keypad is used as wake up source, the clock can not
> be disabled. Or it can not detect key pressing.
> If the keypad is used as wake up source, when resume back,
> do not enable the clock and configure it again because the
> register content is retained.
>
> Signed-off-by: Chao Xie <chao.xie at marvell.com>
> ---
>  drivers/input/keyboard/pxa27x_keypad.c |   27 ++++++++++++++++++---------
>  1 files changed, 18 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
> index 29fe1b2..1c5752f 100644
> --- a/drivers/input/keyboard/pxa27x_keypad.c
> +++ b/drivers/input/keyboard/pxa27x_keypad.c
> @@ -419,10 +419,14 @@ static int pxa27x_keypad_suspend(struct device *dev)
>        struct platform_device *pdev = to_platform_device(dev);
>        struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
>
> -       clk_disable(keypad->clk);
> -
> +       /*
> +        * If the keypad is used a wake up source, clock can not be disabled.
> +        * Or it can not detect the key pressing.
> +        */
>        if (device_may_wakeup(&pdev->dev))
>                enable_irq_wake(keypad->irq);
> +       else
> +               clk_disable(keypad->clk);
I prefer to add one patch to use clk_prepare_enable() &
clk_disable_unprepare() in keypad driver.

>
>        return 0;
>  }
> @@ -433,19 +437,24 @@ static int pxa27x_keypad_resume(struct device *dev)
>        struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
>        struct input_dev *input_dev = keypad->input_dev;
>
> +       /*
> +        * If the keypad is used as wake up source, the clock is not turned
> +        * off. So do not need configure it again.
> +        */
>        if (device_may_wakeup(&pdev->dev))
>                disable_irq_wake(keypad->irq);
> +       else {
> +               mutex_lock(&input_dev->mutex);
>
> -       mutex_lock(&input_dev->mutex);
> +               if (input_dev->users) {
> +                       /* Enable unit clock */
> +                       clk_enable(keypad->clk);
> +                       pxa27x_keypad_config(keypad);
> +               }
>
> -       if (input_dev->users) {
> -               /* Enable unit clock */
> -               clk_enable(keypad->clk);
> -               pxa27x_keypad_config(keypad);
> +               mutex_unlock(&input_dev->mutex);
>        }
>
> -       mutex_unlock(&input_dev->mutex);
> -
>        return 0;
>  }
>
> --
> 1.7.0.4
>
>
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