target/linux/bcm27xx/patches-4.19/950-0443-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch

   1 From afea1f84cbda94c47ba4a8f84d16c4330e145a0a Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Wed, 12 Jun 2019 17:15:05 +0100
   4 Subject: [PATCH] w1: w1-gpio: Make GPIO an output for strong pullup
   5
   6 The logic to drive the data line high to implement a strong pullup
   7 assumed that the pin was already an output - setting a value does
   8 not change an input.
   9
  10 See: https://github.com/raspberrypi/firmware/issues/1143
  11
  12 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  13 ---
  14  drivers/w1/masters/w1-gpio.c | 2 +-
  15  1 file changed, 1 insertion(+), 1 deletion(-)
  16
  17 --- a/drivers/w1/masters/w1-gpio.c
  18 +++ b/drivers/w1/masters/w1-gpio.c
  19 @@ -33,7 +33,7 @@ static u8 w1_gpio_set_pullup(void *data,
  20                          * This will OVERRIDE open drain emulation and force-pull
  21                          * the line high for some time.
  22                          */
  23 -                       gpiod_set_raw_value(pdata->gpiod, 1);
  24 +                       gpiod_direction_output_raw(pdata->gpiod, 1);
  25                         msleep(pdata->pullup_duration);
  26                         /*
  27                          * This will simply set the line as input since we are doing