Commit eb43335c authored by Nick Dyer's avatar Nick Dyer Committed by Dmitry Torokhov

Input: atmel_mxt_ts - use mxt_acquire_irq in mxt_soft_reset

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: default avatarTom Rini <trini@konsulko.com>
Signed-off-by: default avatarNick Dyer <nick.dyer@itdev.co.uk>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 6984ab1a
...@@ -1093,6 +1093,19 @@ static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset, ...@@ -1093,6 +1093,19 @@ static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
return 0; 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) static int mxt_soft_reset(struct mxt_data *data)
{ {
struct device *dev = &data->client->dev; struct device *dev = &data->client->dev;
...@@ -1111,7 +1124,7 @@ static int mxt_soft_reset(struct mxt_data *data) ...@@ -1111,7 +1124,7 @@ static int mxt_soft_reset(struct mxt_data *data)
/* Ignore CHG line for 100ms after reset */ /* Ignore CHG line for 100ms after reset */
msleep(100); msleep(100);
enable_irq(data->irq); mxt_acquire_irq(data);
ret = mxt_wait_for_completion(data, &data->reset_completion, ret = mxt_wait_for_completion(data, &data->reset_completion,
MXT_RESET_TIMEOUT); MXT_RESET_TIMEOUT);
...@@ -1466,19 +1479,6 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg) ...@@ -1466,19 +1479,6 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
return ret; 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) static int mxt_get_info(struct mxt_data *data)
{ {
struct i2c_client *client = data->client; struct i2c_client *client = data->client;
......
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