John AudiaandHauke Mehrtens
39964c9909
Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.83 All patches automatically rebased via update_kernel.sh Signed-off-by: John Audia <therealgraysky@proton.me> Link: https://github.com/openwrt/openwrt/pull/22913 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
51 lines
1.7 KiB
Diff
51 lines
1.7 KiB
Diff
From 42b1f8dfc79d5311e7b009866739c7fc067e05a7 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 24 Apr 2018 14:42:27 +0100
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Subject: [PATCH] gpiolib: Don't prevent IRQ usage of output GPIOs
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Upstream Linux deems using output GPIOs to generate IRQs as a bogus
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use case, even though the BCM2835 GPIO controller is capable of doing
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so. A number of users would like to make use of this facility, so
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disable the checks.
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See: https://github.com/raspberrypi/linux/issues/2527
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/gpio/gpiolib.c | 10 ++++++----
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1 file changed, 6 insertions(+), 4 deletions(-)
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--- a/drivers/gpio/gpiolib.c
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+++ b/drivers/gpio/gpiolib.c
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@@ -51,6 +51,8 @@
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* GPIOs can sometimes cost only an instruction or two per bit.
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*/
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+#define dont_test_bit(b,d) (0)
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+
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/* Device and char device-related information */
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static DEFINE_IDA(gpio_ida);
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static dev_t gpio_devt;
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@@ -2813,8 +2815,8 @@ int gpiod_direction_output(struct gpio_d
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value = !!value;
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/* GPIOs used for enabled IRQs shall not be set as output */
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- if (test_bit(FLAG_USED_AS_IRQ, &flags) &&
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- test_bit(FLAG_IRQ_IS_ENABLED, &flags)) {
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+ if (dont_test_bit(FLAG_USED_AS_IRQ, &flags) &&
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+ dont_test_bit(FLAG_IRQ_IS_ENABLED, &flags)) {
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gpiod_err(desc,
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"%s: tried to set a GPIO tied to an IRQ as output\n",
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__func__);
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@@ -3765,8 +3767,8 @@ int gpiochip_lock_as_irq(struct gpio_chi
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}
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/* To be valid for IRQ the line needs to be input or open drain */
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- if (test_bit(FLAG_IS_OUT, &desc->flags) &&
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- !test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
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+ if (dont_test_bit(FLAG_IS_OUT, &desc->flags) &&
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+ !dont_test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
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chip_err(gc,
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"%s: tried to flag a GPIO set as output for IRQ\n",
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__func__);
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