From 339d6b88e872f8369495a7224916a4d1d8376ca3 Mon Sep 17 00:00:00 2001 From: HungNien Chen Date: Sat, 11 Jul 2015 17:30:19 -0700 Subject: [PATCH] Input: wdt87xx_i2c - change the sleep time to 2500ms after the sw reset The original wait time was 200ms which was enough for the firmware to finish loading and boot. After that the firmware will perform initialization and touch calibration, which will take about 1.1 second. The touch calibration will change controller frequency to scan at the most optimal frequency and during calibration/frequency switching process we may run into i2c data errors. To avoid them we extend the sleep to 2500ms after issuing the sw reset. Signed-off-by: HungNien Chen Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/wdt87xx_i2c.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/input/touchscreen/wdt87xx_i2c.c b/drivers/input/touchscreen/wdt87xx_i2c.c index 764d8f2..515c20a 100644 --- a/drivers/input/touchscreen/wdt87xx_i2c.c +++ b/drivers/input/touchscreen/wdt87xx_i2c.c @@ -157,6 +157,7 @@ /* Controller requires minimum 300us between commands */ #define WDT_COMMAND_DELAY_MS 2 #define WDT_FLASH_WRITE_DELAY_MS 4 +#define WDT_FW_RESET_TIME 2500 struct wdt87xx_sys_param { u16 fw_id; @@ -406,7 +407,7 @@ static int wdt87xx_sw_reset(struct i2c_client *client) } /* Wait the device to be ready */ - msleep(200); + msleep(WDT_FW_RESET_TIME); return 0; } -- 2.7.4