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Input: serio - add fast reconnect option

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Devices connected to serio bus are quite slow, and to improve apparent
speed of resume process, serio core resumes (reconnects) its devices
asynchronously, by posting port reconnect requests to a workqueue.
Unfortunately this means that if there is a dependent device of a given
serio port (for example SMBus part of touchpad connected via both PS/2 and
SMBus), we do not have a good way of ensuring resume order.

This change allows drivers to define "fast reconnect" handlers that would
be called in-line during system resume. Drivers need to ensure that these
handlers are truly "fast".

Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2017-03-03 11:47:40 -08:00
parent 996b9eedd0
commit 5ea1320653
2 changed files with 18 additions and 5 deletions
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22
drivers/input/serio/serio.c
View File

@ -953,12 +953,24 @@ static int serio_suspend(struct device *dev)
static int serio_resume(struct device *dev)
{
struct serio *serio = to_serio_port(dev);
int error = -ENOENT;
/*
* Driver reconnect can take a while, so better let kseriod
* deal with it.
*/
serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT);
mutex_lock(&serio->drv_mutex);
if (serio->drv && serio->drv->fast_reconnect) {
error = serio->drv->fast_reconnect(serio);
if (error && error != -ENOENT)
dev_warn(dev, "fast reconnect failed with error %d\n",
error);
}
mutex_unlock(&serio->drv_mutex);
if (error) {
/*
* Driver reconnect can take a while, so better let
* kseriod deal with it.
*/
serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT);
}
return 0;
}

1
include/linux/serio.h
View File

@ -77,6 +77,7 @@ struct serio_driver {
irqreturn_t (*interrupt)(struct serio *, unsigned char, unsigned int);
int (*connect)(struct serio *, struct serio_driver *drv);
int (*reconnect)(struct serio *);
int (*fast_reconnect)(struct serio *);
void (*disconnect)(struct serio *);
void (*cleanup)(struct serio *);