linux-kernel - Re: [PATCH v3 3/3] Input: ti_am335x_tsc - Prevent system suspend when TSC is in use

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Message-ID: <20180530214439.GC203327@dtor-ws>
Date:   Wed, 30 May 2018 14:44:39 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Vignesh R <vigneshr@...com>
Cc:     Grygorii Strashko <grygorii.strashko@...com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v3 3/3] Input: ti_am335x_tsc - Prevent system suspend
 when TSC is in use

On Tue, Apr 24, 2018 at 11:57:41AM +0530, Vignesh R wrote:
> From: Grygorii Strashko <grygorii.strashko@...com>
> 
> Prevent system suspend while user has finger on touch screen,
> because TSC is wakeup source and suspending device while in use will
> result in failure to disable the module.
> This patch uses pm_stay_awake() and pm_relax() APIs to prevent and
> resume system suspend as required.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> Signed-off-by: Vignesh R <vigneshr@...com>

Applied, thank you.

> ---
> 
> v3: No change
> 
>  drivers/input/touchscreen/ti_am335x_tsc.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index a548b0dbe320..ae6fc9099636 100644
> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> @@ -277,6 +277,7 @@ static irqreturn_t titsc_irq(int irq, void *dev)
>  	if (status & IRQENB_HW_PEN) {
>  		ts_dev->pen_down = true;
>  		irqclr |= IRQENB_HW_PEN;
> +		pm_stay_awake(ts_dev->mfd_tscadc->dev);
>  	}
>  
>  	if (status & IRQENB_PENUP) {
> @@ -286,6 +287,7 @@ static irqreturn_t titsc_irq(int irq, void *dev)
>  			input_report_key(input_dev, BTN_TOUCH, 0);
>  			input_report_abs(input_dev, ABS_PRESSURE, 0);
>  			input_sync(input_dev);
> +			pm_relax(ts_dev->mfd_tscadc->dev);
>  		} else {
>  			ts_dev->pen_down = true;
>  		}
> @@ -524,6 +526,7 @@ static int __maybe_unused titsc_resume(struct device *dev)
>  		titsc_writel(ts_dev, REG_IRQWAKEUP,
>  				0x00);
>  		titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
> +		pm_relax(ts_dev->mfd_tscadc->dev);
>  	}
>  	titsc_step_config(ts_dev);
>  	titsc_writel(ts_dev, REG_FIFO0THR,
> -- 
> 2.17.0
> 

-- 
Dmitry