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From afea1f84cbda94c47ba4a8f84d16c4330e145a0a Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 12 Jun 2019 17:15:05 +0100
Subject: [PATCH] w1: w1-gpio: Make GPIO an output for strong pullup
The logic to drive the data line high to implement a strong pullup
assumed that the pin was already an output - setting a value does
not change an input.
See: https://github.com/raspberrypi/firmware/issues/1143
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
drivers/w1/masters/w1-gpio.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -33,7 +33,7 @@ static u8 w1_gpio_set_pullup(void *data,
* This will OVERRIDE open drain emulation and force-pull
* the line high for some time.
*/
- gpiod_set_raw_value(pdata->gpiod, 1);
+ gpiod_direction_output_raw(pdata->gpiod, 1);
msleep(pdata->pullup_duration);
/*
* This will simply set the line as input since we are doing
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