linux-kernel - [PATCH v4 2/3] Input: atmel_mxt_ts: Wait for device be ready for communication

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Message-Id: <20181207142857.15818-3-pawel.mikolaj.chmiel@gmail.com>
Date:   Fri,  7 Dec 2018 15:28:56 +0100
From:   Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To:     nick@...anahar.org
Cc:     dmitry.torokhov@...il.com, robh+dt@...nel.org,
        mark.rutland@....com, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Subject: [PATCH v4 2/3] Input: atmel_mxt_ts: Wait for device be ready for communication

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 <pawel.mikolaj.chmiel@...il.com>
---
Changes from v3:
  - Fix checkpatch issues
---
 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 1dc8ad0da5af..3f956d07d09e 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
@@ -3068,6 +3069,16 @@ 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;
-- 
2.17.1