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HID: multitouch: optimize the sticky fingers timer 

Instead of unconditionally expiring the timer and calling a long
mt_release_contacts(), we can check if some slots are used when the
timer expires.

We can also remove the timer if we happen to receive all the releases.

The logic behind the MT_IO_FLAGS_PENDING_SLOTS could be implemented by
counting how many slots are active, but using bits feels slightly more
efficient.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Arek Burdach <arek.burdach@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2017-06-15 15:32:05 +02:00 committed by Jiri Kosina
parent 4f4001bc76
commit 9609827458
1 changed files with 18 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/hid/hid-multitouch.c
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@ -79,6 +79,8 @@ MODULE_LICENSE("GPL");
#define MT_BUTTONTYPE_CLICKPAD 0
#define MT_IO_FLAGS_RUNNING 0
#define MT_IO_FLAGS_ACTIVE_SLOTS 1
#define MT_IO_FLAGS_PENDING_SLOTS 2
struct mt_slot {
__s32 x, y, cx, cy, p, w, h;
@ -705,6 +707,8 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
set_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
}
}
@ -720,6 +724,11 @@ static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
input_mt_sync_frame(input);
input_sync(input);
td->num_received = 0;
if (test_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags))
set_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
else
clear_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
clear_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
}
static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
@ -859,8 +868,13 @@ static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
* only affect laggish machines and the ones that have a firmware
* defect.
*/
if (td->mtclass.quirks & MT_QUIRK_STICKY_FINGERS)
mod_timer(&td->release_timer, jiffies + msecs_to_jiffies(100));
if (td->mtclass.quirks & MT_QUIRK_STICKY_FINGERS) {
if (test_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags))
mod_timer(&td->release_timer,
jiffies + msecs_to_jiffies(100));
else
del_timer(&td->release_timer);
}
clear_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
}
@ -1210,7 +1224,8 @@ static void mt_expired_timeout(unsigned long arg)
*/
if (test_and_set_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
return;
mt_release_contacts(hdev);
if (test_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags))
mt_release_contacts(hdev);
clear_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
}