openwrt/target/linux/brcm2708/patches-4.14/950-0280-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch
Koen Vandeputte db94ee6256 kernel: bump 4.14 to 4.14.141
Refreshed all patches.

Compile-tested on: cns3xxx
Runtime-tested on: cns3xxx

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
2019-08-30 16:46:52 +02:00

47 lines
1.5 KiB
Diff

From aeb94070e992a60cf33f0300c8317b39e3ae16db Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 24 Apr 2018 14:42:27 +0100
Subject: [PATCH 280/454] 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 | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -53,6 +53,8 @@
#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;
@@ -2307,7 +2309,7 @@ static int _gpiod_direction_output_raw(s
int ret;
/* GPIOs used for IRQs shall not be set as output */
- if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
+ if (dont_test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
gpiod_err(desc,
"%s: tried to set a GPIO tied to an IRQ as output\n",
__func__);
@@ -2822,7 +2824,7 @@ int gpiochip_lock_as_irq(struct gpio_chi
set_bit(FLAG_IS_OUT, &desc->flags);
}
- 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__);