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ACPI / battery: Accelerate battery resume callback 

Most time of battery resume callback is spent on executing AML code
_BTP, _BIF and _BIF to get battery info, status and set alarm. These
AML methods may access EC operation regions several times and consumes
time.

These operations are not necessary during devices resume and can run
during POST_SUSPEND/HIBERNATION event when all processes are thawed.

This also can avoid removing and adding battery sysfs nodes every system
resume even if the battery unit is not actually changed. The original code
updates sysfs nodes without check and this seems not reasonable.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lan Tianyu 2014-05-04 14:07:06 +08:00 committed by Rafael J. Wysocki
parent 054c1c4539
commit 9e50bc14a7
1 changed files with 27 additions and 9 deletions
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36
drivers/acpi/battery.c
View File

@ -696,7 +696,7 @@ static void acpi_battery_quirks(struct acpi_battery *battery)
}
}
static int acpi_battery_update(struct acpi_battery *battery)
static int acpi_battery_update(struct acpi_battery *battery, bool resume)
{
int result, old_present = acpi_battery_present(battery);
result = acpi_battery_get_status(battery);
@ -707,6 +707,10 @@ static int acpi_battery_update(struct acpi_battery *battery)
battery->update_time = 0;
return 0;
}
if (resume)
return 0;
if (!battery->update_time ||
old_present != acpi_battery_present(battery)) {
result = acpi_battery_get_info(battery);
@ -915,7 +919,7 @@ static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
static int acpi_battery_read(int fid, struct seq_file *seq)
{
struct acpi_battery *battery = seq->private;
int result = acpi_battery_update(battery);
int result = acpi_battery_update(battery, false);
return acpi_print_funcs[fid](seq, result);
}
@ -1030,7 +1034,7 @@ static void acpi_battery_notify(struct acpi_device *device, u32 event)
old = battery->bat.dev;
if (event == ACPI_BATTERY_NOTIFY_INFO)
acpi_battery_refresh(battery);
acpi_battery_update(battery);
acpi_battery_update(battery, false);
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event,
acpi_battery_present(battery));
@ -1045,13 +1049,27 @@ static int battery_notify(struct notifier_block *nb,
{
struct acpi_battery *battery = container_of(nb, struct acpi_battery,
pm_nb);
int result;
switch (mode) {
case PM_POST_HIBERNATION:
case PM_POST_SUSPEND:
if (battery->bat.dev) {
sysfs_remove_battery(battery);
sysfs_add_battery(battery);
}
if (!acpi_battery_present(battery))
return 0;
if (!battery->bat.dev) {
result = acpi_battery_get_info(battery);
if (result)
return result;
result = sysfs_add_battery(battery);
if (result)
return result;
} else
acpi_battery_refresh(battery);
acpi_battery_init_alarm(battery);
acpi_battery_get_state(battery);
break;
}
@ -1087,7 +1105,7 @@ static int acpi_battery_add(struct acpi_device *device)
mutex_init(&battery->sysfs_lock);
if (acpi_has_method(battery->device->handle, "_BIX"))
set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
result = acpi_battery_update(battery);
result = acpi_battery_update(battery, false);
if (result)
goto fail;
#ifdef CONFIG_ACPI_PROCFS_POWER
@ -1149,7 +1167,7 @@ static int acpi_battery_resume(struct device *dev)
return -EINVAL;
battery->update_time = 0;
acpi_battery_update(battery);
acpi_battery_update(battery, true);
return 0;
}
#else