On Mon, 16 May 2016, Vignesh R wrote:
> From: Grygorii Strashko <grygorii.strashko@xxxxxx>
>
> 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@xxxxxx>
> Signed-off-by: Vignesh R <vigneshr@xxxxxx>
> ---
> drivers/input/touchscreen/ti_am335x_tsc.c | 2 ++
> include/linux/mfd/ti_am335x_tscadc.h | 1 +
For the MFD change:
Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
> 2 files changed, 3 insertions(+)
>
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index 4683ed18b9f8..d2c55b5730e6 100644
> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> @@ -441,6 +441,7 @@ static int titsc_probe(struct platform_device *pdev)
> dev_err(&pdev->dev, "irq wake enable failed.\n");
> }
>
> + titsc_writel(ts_dev, REG_IRQSTATUS, IRQENB_MASK);
> titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES);
> titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_EOS);
> err = titsc_config_wires(ts_dev);
> @@ -506,6 +507,7 @@ 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, IRQENB_MASK);
> idle = titsc_readl(ts_dev, REG_IRQENABLE);
> titsc_writel(ts_dev, REG_IRQENABLE,
> (idle | IRQENB_HW_PEN));
> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
> index 1fd50dcfe47c..a7ca0f908ba8 100644
> --- a/include/linux/mfd/ti_am335x_tscadc.h
> +++ b/include/linux/mfd/ti_am335x_tscadc.h
> @@ -60,6 +60,7 @@
> #define IRQENB_FIFO1OVRRUN BIT(6)
> #define IRQENB_FIFO1UNDRFLW BIT(7)
> #define IRQENB_PENUP BIT(9)
> +#define IRQENB_MASK (0x7FF)
>
> /* Step Configuration */
> #define STEPCONFIG_MODE_MASK (3 << 0)
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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