The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From d95da993383c78f7efd25957ba3af23af4b1c613 Mon Sep 17 00:00:00 2001
From: Chris Packham chris.packham@alliedtelesis.co.nz Date: Mon, 8 Jul 2019 08:35:58 +1200 Subject: [PATCH] gpiolib: Preserve desc->flags when setting state
desc->flags may already have values set by of_gpiochip_add() so make sure that this isn't undone when setting the initial direction.
Cc: stable@vger.kernel.org Fixes: 3edfb7bd76bd1cba ("gpiolib: Show correct direction from the beginning") Signed-off-by: Chris Packham chris.packham@alliedtelesis.co.nz Link: https://lore.kernel.org/r/20190707203558.10993-1-chris.packham@alliedtelesis... Signed-off-by: Linus Walleij linus.walleij@linaro.org
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index bf05c29b53be..f497003f119c 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1394,12 +1394,17 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, for (i = 0; i < chip->ngpio; i++) { struct gpio_desc *desc = &gdev->descs[i];
- if (chip->get_direction && gpiochip_line_is_valid(chip, i)) - desc->flags = !chip->get_direction(chip, i) ? - (1 << FLAG_IS_OUT) : 0; - else - desc->flags = !chip->direction_input ? - (1 << FLAG_IS_OUT) : 0; + if (chip->get_direction && gpiochip_line_is_valid(chip, i)) { + if (!chip->get_direction(chip, i)) + set_bit(FLAG_IS_OUT, &desc->flags); + else + clear_bit(FLAG_IS_OUT, &desc->flags); + } else { + if (!chip->direction_input) + set_bit(FLAG_IS_OUT, &desc->flags); + else + clear_bit(FLAG_IS_OUT, &desc->flags); + } }
acpi_gpiochip_add(chip);