mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 07:22:33 +00:00
51 lines
1.7 KiB
Diff
51 lines
1.7 KiB
Diff
|
From 205dc5dbd2b1978f5c75daa0afabf0cf15c8e1fe 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 | 10 ++++++----
|
||
|
|
1 file changed, 6 insertions(+), 4 deletions(-)
|
||
|
|
|
||
|
|
--- a/drivers/gpio/gpiolib.c
|
||
|
|
+++ b/drivers/gpio/gpiolib.c
|
||
|
|
@@ -51,6 +51,8 @@
|
||
|
|
#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;
|
||
|
|
@@ -2444,8 +2446,8 @@ 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__);
|
||
|
|
@@ -3250,8 +3252,8 @@ int gpiochip_lock_as_irq(struct gpio_chi
|
||
|
|
}
|
||
|
|
|
||
|
|
/* To be valid for IRQ the line needs to be input or open drain */
|
||
|
|
- if (test_bit(FLAG_IS_OUT, &desc->flags) &&
|
||
|
|
- !test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
|
||
|
|
+ if (dont_test_bit(FLAG_IS_OUT, &desc->flags) &&
|
||
|
|
+ !dont_test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
|
||
|
|
chip_err(gc,
|
||
|
|
"%s: tried to flag a GPIO set as output for IRQ\n",
|
||
|
|
__func__);
|