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51 lines
1.7 KiB
Diff
51 lines
1.7 KiB
Diff
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From dd537b547de5461ae7fc2064e5037404bcb12f9c 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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@@ -52,6 +52,8 @@
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#define extra_checks 0
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#endif
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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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@@ -2361,8 +2363,8 @@ 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, &desc->flags) &&
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- test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
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+ if (dont_test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
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+ dont_test_bit(FLAG_IRQ_IS_ENABLED, &desc->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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@@ -3180,8 +3182,8 @@ 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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