linux-kernel - [PATCH] Input: mouse: synaptics - change msleep to usleep

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Message-Id: <1480354255-2029-1-git-send-email-a.mathur@samsung.com>
Date:   Mon, 28 Nov 2016 23:00:55 +0530
From:   Aniroop Mathur <a.mathur@...sung.com>
To:     mike@...pulab.co.il, grinberg@...pulab.co.il,
        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: mouse: synaptics - 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/mouse/synaptics_i2c.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/mouse/synaptics_i2c.c b/drivers/input/mouse/synaptics_i2c.c
index aa7c5da..4d688a6 100644
--- a/drivers/input/mouse/synaptics_i2c.c
+++ b/drivers/input/mouse/synaptics_i2c.c
@@ -29,7 +29,7 @@
  * after soft reset, we should wait for 1 ms
  * before the device becomes operational
  */
-#define SOFT_RESET_DELAY_MS	3
+#define SOFT_RESET_DELAY_US	3000
 /* and after hard reset, we should wait for max 500ms */
 #define HARD_RESET_DELAY_MS	500
 
@@ -311,7 +311,7 @@ static int synaptics_i2c_reset_config(struct i2c_client *client)
 	if (ret) {
 		dev_err(&client->dev, "Unable to reset device\n");
 	} else {
-		msleep(SOFT_RESET_DELAY_MS);
+		usleep_range(SOFT_RESET_DELAY_MS, SOFT_RESET_DELAY_MS + 100);
 		ret = synaptics_i2c_config(client);
 		if (ret)
 			dev_err(&client->dev, "Unable to config device\n");
-- 
2.6.2