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Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0521-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch')
-rw-r--r--target/linux/brcm2708/patches-4.19/950-0521-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch27
1 files changed, 27 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0521-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch b/target/linux/brcm2708/patches-4.19/950-0521-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch
new file mode 100644
index 0000000000..7cb7e88d7e
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0521-w1-w1-gpio-Make-GPIO-an-output-for-strong-pullup.patch
@@ -0,0 +1,27 @@
+From d4b6aeeb564bcc56316ba15eaa62d25400dde175 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Wed, 12 Jun 2019 17:15:05 +0100
+Subject: [PATCH 521/703] 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