Input: polled device power saving

For slow running polling, it saves power to align wakeups on tick boundary.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/input/input-polldev.c b/drivers/input/input-polldev.c
index b773d4c756a6..92b359894e81 100644
--- a/drivers/input/input-polldev.c
+++ b/drivers/input/input-polldev.c
@@ -70,6 +70,7 @@ static int input_open_polled_device(struct input_dev *input)
 {
         struct input_polled_dev *dev = input->private;
         int error;
+        unsigned long ticks;
 
         error = input_polldev_start_workqueue();
         if (error)
@@ -78,8 +79,10 @@ static int input_open_polled_device(struct input_dev *input)
         if (dev->flush)
                 dev->flush(dev);
 
-        queue_delayed_work(polldev_wq, &dev->work,
-                           msecs_to_jiffies(dev->poll_interval));
+        ticks = msecs_to_jiffies(dev->poll_interval);
+        if (ticks >= HZ)
+                ticks = round_jiffies(ticks);
+        queue_delayed_work(polldev_wq, &dev->work, ticks);
 
         return 0;
 }