openwrt/target/linux/brcm2708/patches-4.19/950-0515-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch
Álvaro Fernández Rojas 2340c646e6 brcm2708: update to latest patches from RPi foundation
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2019-08-27 11:10:01 +02:00

28 lines
1013 B
Diff

From c348ccd68f85473e13faaaba6f409b00fa06efff Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 12 Jun 2019 17:15:05 +0100
Subject: [PATCH 515/773] 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