summaryrefslogtreecommitdiffstats
path: root/sys-kernel/boest-v5.0.15/raspberrypi/0142-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch
diff options
context:
space:
mode:
Diffstat (limited to 'sys-kernel/boest-v5.0.15/raspberrypi/0142-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch')
-rw-r--r--sys-kernel/boest-v5.0.15/raspberrypi/0142-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch50
1 files changed, 50 insertions, 0 deletions
diff --git a/sys-kernel/boest-v5.0.15/raspberrypi/0142-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch b/sys-kernel/boest-v5.0.15/raspberrypi/0142-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch
new file mode 100644
index 00000000..d2805c5d
--- /dev/null
+++ b/sys-kernel/boest-v5.0.15/raspberrypi/0142-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch
@@ -0,0 +1,50 @@
+From f29fe210d7939a9ef15b9b09bec4156732b0aa2c Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Tue, 24 Apr 2018 14:42:27 +0100
+Subject: [PATCH 142/194] gpiolib: Don't prevent IRQ usage of output GPIOs
+
+Upstream Linux deems using output GPIOs to generate IRQs as a bogus
+use case, even though the BCM2835 GPIO controller is capable of doing
+so. A number of users would like to make use of this facility, so
+disable the checks.
+
+See: https://github.com/raspberrypi/linux/issues/2527
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/gpio/gpiolib.c | 8 +++++---
+ 1 file changed, 5 insertions(+), 3 deletions(-)
+
+diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
+index d1adfdf50fb3..2b969ae77f83 100644
+--- a/drivers/gpio/gpiolib.c
++++ b/drivers/gpio/gpiolib.c
+@@ -54,6 +54,8 @@
+ #define extra_checks 0
+ #endif
+
++#define dont_test_bit(b,d) (0)
++
+ /* Device and char device-related information */
+ static DEFINE_IDA(gpio_ida);
+ static dev_t gpio_devt;
+@@ -2671,8 +2673,8 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
+ value = !!value;
+
+ /* GPIOs used for enabled IRQs shall not be set as output */
+- if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
+- test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
++ if (dont_test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
++ dont_test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
+ gpiod_err(desc,
+ "%s: tried to set a GPIO tied to an IRQ as output\n",
+ __func__);
+@@ -3451,7 +3453,7 @@ int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
+ }
+ }
+
+- if (test_bit(FLAG_IS_OUT, &desc->flags)) {
++ if (dont_test_bit(FLAG_IS_OUT, &desc->flags)) {
+ chip_err(chip,
+ "%s: tried to flag a GPIO set as output for IRQ\n",
+ __func__);