linux-kernel - [PATCH] Input: touchscreen: zylonite_wm97xx - change msleep to usleep

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Message-Id: <1480358695-3024-1-git-send-email-a.mathur@samsung.com>
Date:   Tue, 29 Nov 2016 00:14:55 +0530
From:   Aniroop Mathur <a.mathur@...sung.com>
To:     broonie@...nsource.wolfsonmicro.com, pyro@....com, zap@...elink.ru,
        dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     s.samuel@...sung.com, r.mahale@...sung.com,
        aniroop.mathur@...il.com, Aniroop Mathur <a.mathur@...sung.com>
Subject: [PATCH] Input: touchscreen: zylonite_wm97xx - change msleep to usleep_range for small msecs

msleep(1~20) may not do what the caller intends, and will often sleep longer.
(~20 ms actual sleep for any value given in the 1~20ms range)
This is not the desired behaviour for many cases like device resume time,
device suspend time, device enable time, retry logic, etc.
Thus, change msleep to usleep_range for precise wakeups.

Signed-off-by: Aniroop Mathur <a.mathur@...sung.com>
---
 drivers/input/touchscreen/zylonite-wm97xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/zylonite-wm97xx.c b/drivers/input/touchscreen/zylonite-wm97xx.c
index e2ccd68..cebd3a8 100644
--- a/drivers/input/touchscreen/zylonite-wm97xx.c
+++ b/drivers/input/touchscreen/zylonite-wm97xx.c
@@ -81,7 +81,7 @@ static void wm97xx_acc_pen_up(struct wm97xx *wm)
 {
 	int i;
 
-	msleep(1);
+	usleep_range(1000, 1100);
 
 	for (i = 0; i < 16; i++)
 		MODR;
@@ -98,7 +98,7 @@ static int wm97xx_acc_pen_down(struct wm97xx *wm)
 	 * for samples.  The controller can't have a suitably low
 	 * threshold set to use the notifications it gives.
 	 */
-	msleep(1);
+	usleep_range(1000, 1100);
 
 	if (tries > 5) {
 		tries = 0;
-- 
2.6.2