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gpio: pcf857x: Fix missing first interrupt
commita8002a3593
upstream. 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:6e20a0a429
("gpio: pcf857x: enable gpio_to_irq() support") Signed-off-by: Maxim Kiselev <bigunclemax@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -332,7 +332,7 @@ static int pcf857x_probe(struct i2c_client *client,
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* reset state. Otherwise it flags pins to be driven low.
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*/
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gpio->out = ~n_latch;
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gpio->status = gpio->out;
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gpio->status = gpio->read(gpio->client);
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status = devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
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if (status < 0)
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