From: Evan Green evgreen@chromium.org
[ Upstream commit 463fa44eec2fef50d111ed0199cf593235065c04 ]
Across suspend and resume, we are seeing error messages like the following:
atmel_mxt_ts i2c-PRP0001:00: __mxt_read_reg: i2c transfer failed (-121) atmel_mxt_ts i2c-PRP0001:00: Failed to read T44 and T5 (-121)
This occurs because the driver leaves its IRQ enabled. Upon resume, there is an IRQ pending, but the interrupt is serviced before both the driver and the underlying I2C bus have been resumed. This causes EREMOTEIO errors.
Disable the IRQ in suspend, and re-enable it on resume. If there are cases where the driver enters suspend with interrupts disabled, that's a bug we should fix separately.
Signed-off-by: Evan Green evgreen@chromium.org Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/input/touchscreen/atmel_mxt_ts.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index a7ace07e179e..e8f98de60df3 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -3162,6 +3162,8 @@ static int __maybe_unused mxt_suspend(struct device *dev)
mutex_unlock(&input_dev->mutex);
+ disable_irq(data->irq); + return 0; }
@@ -3174,6 +3176,8 @@ static int __maybe_unused mxt_resume(struct device *dev) if (!input_dev) return 0;
+ enable_irq(data->irq); + mutex_lock(&input_dev->mutex);
if (input_dev->users)