From 9609827458c37d7b2c37f2a9255631c603a5004c Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Thu, 15 Jun 2017 15:32:05 +0200 Subject: 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 Tested-by: Arek Burdach Signed-off-by: Jiri Kosina --- drivers/hid/hid-multitouch.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) (limited to 'drivers/hid/hid-multitouch.c') diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 25641b2f90ab..f3e35e7a189d 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -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); } -- cgit v1.2.3