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authorMaxim Kiselev <bigunclemax@gmail.com>2021-02-17 14:10:00 +0100
committerBartosz Golaszewski <bgolaszewski@baylibre.com>2021-02-18 15:52:44 +0100
commita8002a35935aaefcd6a42ad3289f62bab947f2ca (patch)
treea7496c7662fc06e50935844f109b2f6063ae0343 /drivers/gpio
parent35d9e69592419fa2d138f64a2e4286635cdd98ac (diff)
downloadlinux-a8002a35935aaefcd6a42ad3289f62bab947f2ca.tar.bz2
gpio: pcf857x: Fix missing first interrupt
If no n_latch value will be provided at driver probe then all pins will be used as an input: gpio->out = ~n_latch; In that case initial state for all pins is "one": gpio->status = gpio->out; So if pcf857x IRQ happens with change pin value from "zero" to "one" then we miss it, because of "one" from IRQ and "one" from initial state leaves corresponding pin unchanged: change = (gpio->status ^ status) & gpio->irq_enabled; The right solution will be to read actual state at driver probe. Cc: stable@vger.kernel.org Fixes: 6e20a0a429bd ("gpio: pcf857x: enable gpio_to_irq() support") Signed-off-by: Maxim Kiselev <bigunclemax@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-pcf857x.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index a2a8d155c75e..b7568ee33696 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -332,7 +332,7 @@ static int pcf857x_probe(struct i2c_client *client,
* reset state. Otherwise it flags pins to be driven low.
*/
gpio->out = ~n_latch;
- gpio->status = gpio->out;
+ gpio->status = gpio->read(gpio->client);
/* Enable irqchip if we have an interrupt */
if (client->irq) {