From: Puyou Lu puyou.lu@gmail.com
commit dba785798526a3282cc4d0f0ea751883715dbbb4 upstream.
When one port's input state get inverted (eg. from low to hight) after pca953x_irq_setup but before setting irq_mask (by some other driver such as "gpio-keys"), the next inversion of this port (eg. from hight to low) will not be triggered any more (because irq_stat is not updated at the first time). Issue should be fixed after this commit.
Fixes: 89ea8bbe9c3e ("gpio: pca953x.c: add interrupt handling capability") Signed-off-by: Puyou Lu puyou.lu@gmail.com Signed-off-by: Bartosz Golaszewski brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpio/gpio-pca953x.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -761,11 +761,11 @@ static bool pca953x_irq_pending(struct p bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio); bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
+ bitmap_copy(chip->irq_stat, new_stat, gc->ngpio); + if (bitmap_empty(trigger, gc->ngpio)) return false;
- bitmap_copy(chip->irq_stat, new_stat, gc->ngpio); - bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio); bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio); bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);