From: Jiada Wang <jiada_wang@mentor.com>
To: <nick@shmanahar.org>, <dmitry.torokhov@gmail.com>,
<jikos@kernel.org>, <benjamin.tissoires@redhat.com>,
<rydberg@bitmath.org>
Cc: <linux-input@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<jiada_wang@mentor.com>
Subject: [PATCH v3 35/49] input: atmel_mxt_ts: Add Missing Delay for reset handling of Atmel touch panel controller in detachable displays.
Date: Tue, 17 Sep 2019 18:41:23 +0900 [thread overview]
Message-ID: <20190917094137.18851-2-jiada_wang@mentor.com> (raw)
In-Reply-To: <20190917094137.18851-1-jiada_wang@mentor.com>
From: keerthikumarp <Keerthikumar.Padmanabha@in.bosch.com>
In case of attached display, the touchpanel reset is controlled
via imx gpio's from atmel driver and the delay between
touchpanel reset and the time at which the chip becomes capable to
communicate with the host processor, has be taken care.
However in case of detachable displays, the touchpanel reset is
controlled via a deserializer gpio which is triggered just before
the atmel driver is probed.The delay between touchpanel reset and
the time at which the chip becomes capable to communicate (as
specified in datasheet) was not being accounted for. This patch
introduces that delay.
Signed-off-by: keerthikumarp <Keerthikumar.Padmanabha@in.bosch.com>
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 4670880e52a2..4fa27e2f7163 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -4113,6 +4113,10 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
msleep(MXT_RESET_GPIO_TIME);
gpiod_set_value(data->reset_gpio, 1);
msleep(MXT_RESET_INVALID_CHG);
+ } else {
+ dev_dbg(&client->dev,
+ "atmel reset pin not found in device tree");
+ msleep(MXT_RESET_TIME);
}
error = mxt_initialize(data);
--
2.19.2
next prev parent reply other threads:[~2019-09-17 9:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-17 9:41 [PATCH v3 34/49] input: atmel_mxt_ts: export GPIO reset line via sysfs Jiada Wang
2019-09-17 9:41 ` Jiada Wang [this message]
2019-09-17 9:41 ` [PATCH v3 36/49] Input: atmel_mxt_ts: Add support for run self-test routine Jiada Wang
2019-09-17 9:41 ` [PATCH v3 37/49] Input: atmel_mxt_ts: Limit the max bytes transferred in an i2c transaction Jiada Wang
2019-09-17 9:41 ` [PATCH v3 38/49] Input: atmel_mxt_ts: return error from mxt_process_messages_until_invalid() Jiada Wang
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