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[7/9] Input: atmel_mxt_ts - disable interrupt for 50ms after reset

Message ID 1438615397-17112-8-git-send-email-nick.dyer@itdev.co.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Nick Dyer Aug. 3, 2015, 3:23 p.m. UTC 
The CHG/interrupt line is momentarily set (approximately 100 ms) as an
input after power-up or reset for diagnostic purposes. This may cause
spurious interrupts, so disable interrupt handler during this period.

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 7c14faa..ff48d45 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1098,7 +1098,9 @@  static int mxt_soft_reset(struct mxt_data *data)
 	struct device *dev = &data->client->dev;
 	int ret = 0;
 
-	dev_info(dev, "Resetting chip\n");
+	dev_info(dev, "Resetting device\n");
+
+	disable_irq(data->irq);
 
 	reinit_completion(&data->reset_completion);
 
@@ -1106,6 +1108,11 @@  static int mxt_soft_reset(struct mxt_data *data)
 	if (ret)
 		return ret;
 
+	/* Ignore CHG line for 100ms after reset */
+	msleep(100);
+
+	enable_irq(data->irq);
+
 	ret = mxt_wait_for_completion(data, &data->reset_completion,
 				      MXT_RESET_TIMEOUT);
 	if (ret)