linux-kernel - Re: [PATCH v3 2/3] Input: ti_am335x_tsc - Ack pending IRQs at probe and before suspend

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Date:   Wed, 30 May 2018 14:44:30 -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 2/3] Input: ti_am335x_tsc - Ack pending IRQs at probe
 and before suspend

On Tue, Apr 24, 2018 at 11:57:40AM +0530, Vignesh R wrote:
> From: Grygorii Strashko <grygorii.strashko@...com>
> 
> It is seen that just enabling the TSC module triggers a HW_PEN IRQ
> without any interaction with touchscreen by user. This results in first
> suspend/resume sequence to fail as system immediately wakes up from
> suspend as soon as HW_PEN IRQ is enabled in suspend handler due to the
> pending IRQ. Therefore clear all IRQs at probe and also in suspend
> callback for sanity.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> Signed-off-by: Vignesh R <vigneshr@...com>

Applied, thank you.

> ---
> 
> v3: Clear IRQs related to TSC module only
> 
>  drivers/input/touchscreen/ti_am335x_tsc.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index 3908c21862c7..a548b0dbe320 100644
> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> @@ -35,6 +35,8 @@
>  #define SEQ_SETTLE		275
>  #define MAX_12BIT		((1 << 12) - 1)
>  
> +#define TSC_IRQENB_MASK		(IRQENB_FIFO0THRES | IRQENB_EOS | IRQENB_HW_PEN)
> +
>  static const int config_pins[] = {
>  	STEPCONFIG_XPP,
>  	STEPCONFIG_XNN,
> @@ -437,6 +439,7 @@ static int titsc_probe(struct platform_device *pdev)
>  	if (err)
>  		dev_err(&pdev->dev, "irq wake enable failed.\n");
>  
> +	titsc_writel(ts_dev, REG_IRQSTATUS, TSC_IRQENB_MASK);
>  	titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES);
>  	titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_EOS);
>  	err = titsc_config_wires(ts_dev);
> @@ -502,6 +505,7 @@ static int __maybe_unused titsc_suspend(struct device *dev)
>  
>  	tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
>  	if (device_may_wakeup(tscadc_dev->dev)) {
> +		titsc_writel(ts_dev, REG_IRQSTATUS, TSC_IRQENB_MASK);
>  		idle = titsc_readl(ts_dev, REG_IRQENABLE);
>  		titsc_writel(ts_dev, REG_IRQENABLE,
>  				(idle | IRQENB_HW_PEN));
> -- 
> 2.17.0
> 

-- 
Dmitry