From: Stephen Hemminger <shemminger@linux-foundation.org>
To: dmitry.torokhov@gmail.com
Cc: linux-input@atrey.karlin.mff.cuni.cz
Subject: [PATCH] input: polled device power saving
Date: Wed, 12 Sep 2007 13:41:41 +0200 [thread overview]
Message-ID: <20070912134141.38c32f6c@oldman> (raw)
For slow running polling, it saves power to align wakeups on tick boundary.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
--- a/drivers/input/input-polldev.c 2007-06-22 03:36:04.000000000 +0200
+++ b/drivers/input/input-polldev.c 2007-09-12 13:18:59.000000000 +0200
@@ -70,6 +70,7 @@ static int input_open_polled_device(stru
{
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(stru
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;
}
next reply other threads:[~2007-09-12 11:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-12 11:41 Stephen Hemminger [this message]
2007-09-12 14:51 ` [PATCH] input: polled device power saving Dmitry Torokhov
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