Input: ti_am335x_tsc - ack pending IRQs at probe and before suspend

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@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index f1043ae71dcc..a8c828de723c 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -34,6 +34,8 @@
 #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,
@@ -432,6 +434,7 @@ static int titsc_probe(struct platform_device *pdev)
                 goto err_free_mem;
         }
 
+        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);
@@ -495,6 +498,7 @@ 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));