[PATCH v2 2/3] Input: ti_am335x_tsc - Ack pending IRQs at probe and before suspend
From: Vignesh R
Date: Sat Apr 14 2018 - 05:51:23 EST
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>
Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
v2: Add Acks from v1.
drivers/input/touchscreen/ti_am335x_tsc.c | 2 ++
include/linux/mfd/ti_am335x_tscadc.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 810e05c9c4f5..dcd9db768169 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -439,6 +439,7 @@ 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);
@@ -504,6 +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, 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 b9a53e013bff..1a6a34f726cc 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -63,6 +63,7 @@
#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)
--
2.17.0