linux-kernel - Re: [PATCH 2/2] Input: omap-keypad: Fix idle configration to not block SoC idle states

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Date:   Mon, 3 Dec 2018 20:00:01 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Axel Haslam <axelhaslam@...com>,
        Illia Smyrnov <illia.smyrnov@...com>,
        Marcel Partap <mpartap@....net>,
        Merlijn Wajer <merlijn@...zup.org>,
        Michael Scott <hashcode0f@...il.com>,
        NeKit <nekit1000@...il.com>, Pavel Machek <pavel@....cz>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH 2/2] Input: omap-keypad: Fix idle configration to not
 block SoC idle states

Hi Tony,

On Mon, Dec 03, 2018 at 03:12:51PM -0800, Tony Lindgren wrote:
> 
> With PM enabled, I noticed that pressing a key on the droid4 keyboard will
> block deeper idle states for the SoC. Looks like we can fix this by
> managing the idle register to gether with the interrupt similar to what
> we already do for the GPIO controller.

Can you show me where exactly we are doing this? I can't seem to find
the matching code.

Thanks!

> 
> And there's no need to keep enabling and disabling interrupts and
> wake-up events for normal use if we use IRQF_ONESHOT as suggested by
> Dmitry Torokhov <dmitry.torokhov@...il.com> so let's do that too.
> 
> Cc: Axel Haslam <axelhaslam@...com>
> Cc: Illia Smyrnov <illia.smyrnov@...com>
> Cc: Marcel Partap <mpartap@....net>
> Cc: Merlijn Wajer <merlijn@...zup.org>
> Cc: Michael Scott <hashcode0f@...il.com>
> Cc: NeKit <nekit1000@...il.com>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Sebastian Reichel <sre@...nel.org>
> Reported-by: Pavel Machek <pavel@....cz>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>  drivers/input/keyboard/omap4-keypad.c | 30 ++++++++++-----------------
>  1 file changed, 11 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
> --- a/drivers/input/keyboard/omap4-keypad.c
> +++ b/drivers/input/keyboard/omap4-keypad.c
> @@ -53,11 +53,12 @@
>  /* OMAP4 bit definitions */
>  #define OMAP4_DEF_IRQENABLE_EVENTEN	BIT(0)
>  #define OMAP4_DEF_IRQENABLE_LONGKEY	BIT(1)
> -#define OMAP4_DEF_WUP_EVENT_ENA		BIT(0)
> -#define OMAP4_DEF_WUP_LONG_KEY_ENA	BIT(1)
>  #define OMAP4_DEF_CTRL_NOSOFTMODE	BIT(1)
>  #define OMAP4_DEF_CTRL_PTV_SHIFT	2
>  
> +#define OMAP4_KBD_IRQ_MASK		(OMAP4_DEF_IRQENABLE_LONGKEY | \
> +					 OMAP4_DEF_IRQENABLE_EVENTEN)
> +
>  /* OMAP4 values */
>  #define OMAP4_VAL_IRQDISABLE		0x0
>  
> @@ -126,12 +127,8 @@ static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
>  {
>  	struct omap4_keypad *keypad_data = dev_id;
>  
> -	if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)) {
> -		/* Disable interrupts */
> -		kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
> -				 OMAP4_VAL_IRQDISABLE);
> +	if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS))
>  		return IRQ_WAKE_THREAD;
> -	}
>  
>  	return IRQ_NONE;
>  }
> @@ -173,11 +170,6 @@ static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
>  	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
>  			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
>  
> -	/* enable interrupts */
> -	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
> -		OMAP4_DEF_IRQENABLE_EVENTEN |
> -				OMAP4_DEF_IRQENABLE_LONGKEY);
> -
>  	return IRQ_HANDLED;
>  }
>  
> @@ -197,11 +189,10 @@ static int omap4_keypad_open(struct input_dev *input)
>  	/* clear pending interrupts */
>  	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
>  			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
> -	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
> -			OMAP4_DEF_IRQENABLE_EVENTEN |
> -				OMAP4_DEF_IRQENABLE_LONGKEY);
> -	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
> -			OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
> +
> +	/* enable interrupts and wake-up events */
> +	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE, OMAP4_KBD_IRQ_MASK);
> +	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, OMAP4_KBD_IRQ_MASK);
>  
>  	enable_irq(keypad_data->irq);
>  
> @@ -214,9 +205,10 @@ static void omap4_keypad_close(struct input_dev *input)
>  
>  	disable_irq(keypad_data->irq);
>  
> -	/* Disable interrupts */
> +	/* Disable interrupts and wake-up events */
>  	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
>  			 OMAP4_VAL_IRQDISABLE);
> +	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, 0);
>  
>  	/* clear pending interrupts */
>  	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
> @@ -365,7 +357,7 @@ static int omap4_keypad_probe(struct platform_device *pdev)
>  	}
>  
>  	error = request_threaded_irq(keypad_data->irq, omap4_keypad_irq_handler,
> -				     omap4_keypad_irq_thread_fn, 0,
> +				     omap4_keypad_irq_thread_fn, IRQF_ONESHOT,
>  				     "omap4-keypad", keypad_data);
>  	if (error) {
>  		dev_err(&pdev->dev, "failed to register interrupt\n");
> -- 
> 2.19.2

-- 
Dmitry