[PATCH v3 2/3] Input: atmel_mxt_ts: Wait for device be ready for communication
From: Paweł Chmiel <hidden>
Date: 2018-07-31 15:18:30
Also in:
linux-arm-kernel, linux-devicetree, lkml
Subsystem:
atmel maxtouch driver, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Nick Dyer, Dmitry Torokhov, Linus Torvalds
According to documentation, device isn't ready for communication, until firmware asserts the CHG line. Add missing wait for this. Signed-off-by: Paweł Chmiel <redacted> --- drivers/input/touchscreen/atmel_mxt_ts.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 2cd7f6db6ba9..79e08916359f 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c@@ -202,6 +202,7 @@ enum t100_type { #define MXT_CRC_TIMEOUT 1000 /* msec */ #define MXT_FW_RESET_TIME 3000 /* msec */ #define MXT_FW_CHG_TIMEOUT 300 /* msec */ +#define MXT_POWERON_DELAY 150 /* msec */ /* Command to unlock bootloader */ #define MXT_UNLOCK_CMD_MSB 0xaa
@@ -3046,6 +3047,16 @@ static int mxt_regulator_enable(struct mxt_data *data) msleep(MXT_REGULATOR_DELAY); gpiod_set_value(data->reset_gpio, 1); msleep(MXT_RESET_INVALID_CHG); + +retry_wait: + reinit_completion(&data->bl_completion); + data->in_bootloader = true; + error = mxt_wait_for_completion(data, &data->bl_completion, + MXT_POWERON_DELAY); + if (error == -EINTR) + goto retry_wait; + + data->in_bootloader = false; } return 0;
--
2.7.4