diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0443-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0443-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0443-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch b/target/linux/brcm2708/patches-4.19/950-0443-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch new file mode 100644 index 0000000000..6229fdc38d --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0443-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch @@ -0,0 +1,27 @@ +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 |