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From aeb94070e992a60cf33f0300c8317b39e3ae16db 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 280/454] 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 | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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--- a/drivers/gpio/gpiolib.c
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+++ b/drivers/gpio/gpiolib.c
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@@ -53,6 +53,8 @@
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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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@@ -2306,7 +2308,7 @@ static int _gpiod_direction_output_raw(s
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int ret;
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/* GPIOs used for IRQs shall not be set as output */
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- if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
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+ if (dont_test_bit(FLAG_USED_AS_IRQ, &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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@@ -2832,7 +2834,7 @@ int gpiochip_lock_as_irq(struct gpio_chi
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set_bit(FLAG_IS_OUT, &desc->flags);
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}
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- if (test_bit(FLAG_IS_OUT, &desc->flags)) {
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+ if (dont_test_bit(FLAG_IS_OUT, &desc->flags)) {
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chip_err(chip,
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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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