linux-kernel - [PATCH v7 44/48] Input: atmel_mxt_ts: use gpiod_set_value

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200212084218.32344-45-jiada_wang@mentor.com>
Date:   Wed, 12 Feb 2020 00:42:14 -0800
From:   Jiada Wang <jiada_wang@...tor.com>
To:     <jikos@...nel.org>, <benjamin.tissoires@...hat.com>,
        <rydberg@...math.org>, <dmitry.torokhov@...il.com>,
        <nick@...anahar.org>, <bsz@...ihalf.com>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <erosca@...adit-jv.com>, <Andrew_Gabbasov@...tor.com>,
        <jiada_wang@...tor.com>
Subject: [PATCH v7 44/48] Input: atmel_mxt_ts: use gpiod_set_value_cansleep for reset pin

From: Balasubramani Vivekanandan <balasubramani_vivekanandan@...tor.com>

In case of remote display, touch controller will be also remote.
In such cases, the reset pin of the touch controller will be
controlled through bridging ICs like Deserilizer and Serializer.
Therefore accessing the gpio pins require transactions with the
external IC. Using the function gpiod_set_value will print a
warning like below

WARNING: CPU: 0 PID: 576 at drivers/gpio/gpiolib.c:1441 gpiod_set_value+0x34/0x60()
CPU: 0 PID: 576 Comm: modprobe Not tainted 3.14.79-08377-g84ea22f-dirty #4
Backtrace:
[<80011c58>] (dump_backtrace) from [<80011e60>] (show_stack+0x18/0x1c)
[<80011e48>] (show_stack) from [<8052d7ac>] (dump_stack+0x7c/0x9c)
[<8052d730>] (dump_stack) from [<800241bc>] (warn_slowpath_common+0x74/0x9c)
[<80024148>] (warn_slowpath_common) from [<80024288>] (warn_slowpath_null+0x24/0x2c)
[<80024264>] (warn_slowpath_null) from [<8029e070>] (gpiod_set_value+0x34/0x60)
[<8029e03c>] (gpiod_set_value) from [<7f492e98>] (mxt_probe+0x1e0/0x718 [atmel_mxt_ts])
[<7f492cb8>] (mxt_probe [atmel_mxt_ts]) from [<803c4d34>] (i2c_device_probe+0xcc/0xec)
[<803c4c68>] (i2c_device_probe) from [<803252a0>] (driver_probe_device+0xc0/0x200)

Signed-off-by: Balasubramani Vivekanandan <balasubramani_vivekanandan@...tor.com>
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Signed-off-by: Sanjeev Chugh <sanjeev_chugh@...tor.com>
Signed-off-by: George G. Davis <george_davis@...tor.com>
Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index fb0941b5bd47..3784182d896f 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -2487,7 +2487,7 @@ static void mxt_regulator_enable(struct mxt_data *data)
 	if (!data->reg_vdd || !data->reg_avdd)
 		return;
 
-	gpiod_set_value(data->reset_gpio, 0);
+	gpiod_set_value_cansleep(data->reset_gpio, 0);
 
 	error = regulator_enable(data->reg_vdd);
 	if (error)
@@ -2505,7 +2505,7 @@ static void mxt_regulator_enable(struct mxt_data *data)
 	 * voltage
 	 */
 	msleep(MXT_REGULATOR_DELAY);
-	gpiod_set_value(data->reset_gpio, 1);
+	gpiod_set_value_cansleep(data->reset_gpio, 1);
 	msleep(MXT_CHG_DELAY);
 
 retry_wait:
@@ -4310,7 +4310,7 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		disable_irq(data->irq);
 	} else if (data->reset_gpio) {
 		msleep(MXT_RESET_GPIO_TIME);
-		gpiod_set_value(data->reset_gpio, 1);
+		gpiod_set_value_cansleep(data->reset_gpio, 1);
 		msleep(MXT_RESET_INVALID_CHG);
 	} else {
 		dev_dbg(&client->dev,
-- 
2.17.1