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Input: atmel_mxt_ts - use mxt_acquire_irq in mxt_soft_reset

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If using IRQF_TRIGGER_FALLING, then there is a race here: if the reset
completes before we enable the IRQ, then CHG is already low and touch
will be broken.

This has been seen on Chromebook Pixel 2.

A workaround is to reconfig T18 COMMSCONFIG to enable the RETRIGEN bit
using mxt-app:
    mxt-app -W -T18 44
    mxt-app --backup

Tested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Nick Dyer 2016-04-25 14:18:52 -07:00 committed by Dmitry Torokhov
parent 6984ab1ab3
commit eb43335c40
1 changed files with 14 additions and 14 deletions
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28
drivers/input/touchscreen/atmel_mxt_ts.c
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@ -1093,6 +1093,19 @@ static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
return 0;
}
static int mxt_acquire_irq(struct mxt_data *data)
{
int error;
enable_irq(data->irq);
error = mxt_process_messages_until_invalid(data);
if (error)
return error;
return 0;
}
static int mxt_soft_reset(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
@ -1111,7 +1124,7 @@ static int mxt_soft_reset(struct mxt_data *data)
/* Ignore CHG line for 100ms after reset */
msleep(100);
enable_irq(data->irq);
mxt_acquire_irq(data);
ret = mxt_wait_for_completion(data, &data->reset_completion,
MXT_RESET_TIMEOUT);
@ -1466,19 +1479,6 @@ release_mem:
return ret;
}
static int mxt_acquire_irq(struct mxt_data *data)
{
int error;
enable_irq(data->irq);
error = mxt_process_messages_until_invalid(data);
if (error)
return error;
return 0;
}
static int mxt_get_info(struct mxt_data *data)
{
struct i2c_client *client = data->client;