Blackfin arch: Add workaround to read edge triggered GPIOs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index 7e8eaf4..b6d89d1 100644 (file)
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -1130,6 +1130,25 @@ void bfin_gpio_irq_prepare(unsigned gpio)
 
 #else
 
+int gpio_get_value(unsigned gpio)
+{
+       unsigned long flags;
+       int ret;
+
+       if (unlikely(get_gpio_edge(gpio))) {
+               local_irq_save(flags);
+               set_gpio_edge(gpio, 0);
+               ret = get_gpio_data(gpio);
+               set_gpio_edge(gpio, 1);
+               local_irq_restore(flags);
+
+               return ret;
+       } else
+               return get_gpio_data(gpio);
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+
 int gpio_direction_input(unsigned gpio)
 {
        unsigned long flags;

diff --git a/include/asm-blackfin/gpio.h b/include/asm-blackfin/gpio.h
index 27ff532..ff95e9d 100644 (file)
--- a/include/asm-blackfin/gpio.h
+++ b/include/asm-blackfin/gpio.h
@@ -437,7 +437,6 @@ void gpio_set_value(unsigned gpio, int arg);
 int gpio_get_value(unsigned gpio);
 
 #ifndef BF548_FAMILY
-#define gpio_get_value(gpio)           get_gpio_data(gpio)
 #define gpio_set_value(gpio, value)    set_gpio_data(gpio, value)
 #endif