openwrt/target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch
Petr Štetiar b299002877 kernel: bump 5.4 to 5.4.31
Refreshed patches, removed upstreamed patches:

 oxnas:   003-ARM-dts-oxnas-Fix-clear-mask-property.patch
 generic: 184-USB-serial-option-add-Wistron-Neweb-D19Q1.patch

Run tested: apu2, qemu-x86-64, apalis
Build tested: sunxi/a53, imx6, x86/64, ipq40xx

Tested-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk> [apu2]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
2020-04-09 00:12:46 +02:00

49 lines
1.6 KiB
Diff

From 122b21149cada59805040895f3d679ceb0e00063 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 24 Apr 2018 14:42:27 +0100
Subject: [PATCH] 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(-)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -55,6 +55,8 @@
#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;
@@ -3091,8 +3093,8 @@ int gpiod_direction_output(struct gpio_d
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__);
@@ -3894,7 +3896,7 @@ int gpiochip_lock_as_irq(struct gpio_chi
}
}
- 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__);