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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>
This commit is contained in:
Aniroop Mathur 2016-12-18 15:27:16 -08:00 committed by Dmitry Torokhov
parent 41c567a5d7
commit 67626c9323
1 changed files with 2 additions and 2 deletions
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4
drivers/input/mouse/synaptics_i2c.c
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@ -29,7 +29,7 @@
* after soft reset, we should wait for 1 ms * after soft reset, we should wait for 1 ms
* before the device becomes operational * 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 */ /* and after hard reset, we should wait for max 500ms */
#define HARD_RESET_DELAY_MS 500 #define HARD_RESET_DELAY_MS 500
@ -311,7 +311,7 @@ static int synaptics_i2c_reset_config(struct i2c_client *client)
if (ret) { if (ret) {
dev_err(&client->dev, "Unable to reset device\n"); dev_err(&client->dev, "Unable to reset device\n");
} else { } else {
msleep(SOFT_RESET_DELAY_MS); usleep_range(SOFT_RESET_DELAY_US, SOFT_RESET_DELAY_US + 100);
ret = synaptics_i2c_config(client); ret = synaptics_i2c_config(client);
if (ret) if (ret)
dev_err(&client->dev, "Unable to config device\n"); dev_err(&client->dev, "Unable to config device\n");