Re: [Patch 1/1] Input: edt-ft5x06 - disable irq handling during suspend
From: Andy Shevchenko <hidden>
Date: 2019-06-22 10:37:23
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On Fri, Jun 21, 2019 at 9:53 PM Benoit Parrot [off-list ref] wrote:
As a wakeup source when the system is in suspend there is little point trying to access a register across the i2c bus as it is probably still inactive. We need to prevent the irq handler from being called during suspend.
Hmm... But how OS will know what the event to handle afterwards? I mean shouldn't we guarantee somehow the delivery of the event to the input, in this case, subsystem followed by corresponding user space?
quoted hunk ↗ jump to hunk
Without this modification upon wakeup you would see the following kernel error: [ 118.733717] PM: Wakeup source GPIO0 [ 118.751933] edt_ft5x06 1-0038: Unable to fetch data, error: -13 Signed-off-by: Benoit Parrot <redacted> --- drivers/input/touchscreen/edt-ft5x06.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c index c639ebce914c..c885bfe783a4 100644 --- a/drivers/input/touchscreen/edt-ft5x06.c +++ b/drivers/input/touchscreen/edt-ft5x06.c@@ -1200,8 +1200,10 @@ static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); - if (device_may_wakeup(dev)) + if (device_may_wakeup(dev)) { enable_irq_wake(client->irq); + disable_irq(client->irq); + } return 0; }@@ -1210,8 +1212,10 @@ static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); - if (device_may_wakeup(dev)) + if (device_may_wakeup(dev)) { disable_irq_wake(client->irq); + enable_irq(client->irq); + } return 0; } --2.17.1
-- With Best Regards, Andy Shevchenko