Input: synaptics_i2c - 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@samsung.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/mouse/synaptics_i2c.c b/drivers/input/mouse/synaptics_i2c.c
index aa7c5da..cb2bf20 100644 (file)
--- 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_US, SOFT_RESET_DELAY_US + 100);
                ret = synaptics_i2c_config(client);
                if (ret)
                        dev_err(&client->dev, "Unable to config device\n");