diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch b/target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch new file mode 100644 index 0000000000..ca66626711 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch @@ -0,0 +1,48 @@ +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; +@@ -3084,8 +3086,8 @@ 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__); +@@ -3887,7 +3889,7 @@ 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__); |