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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2017-06-15 15:32:05 +0200
committerJiri Kosina <jkosina@suse.cz>2017-06-23 10:16:17 +0200
commit9609827458c37d7b2c37f2a9255631c603a5004c (patch)
treef947131dc722f22ea87c3c01fbbfccdc333074da /drivers/hid/hid-multitouch.c
parent4f4001bc76fd1a138a501fbd3d68cce72cbf96ce (diff)
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>
Diffstat (limited to 'drivers/hid/hid-multitouch.c')
-rw-r--r--drivers/hid/hid-multitouch.c21
1 files changed, 18 insertions, 3 deletions
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);
}