[PATCH 6.12 694/826] gpio: exar: set value when external pull-up or pull-down is present

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6.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sai Kumar Cholleti <skmr537@xxxxxxxxx>

commit 72cef64180de04a7b055b4773c138d78f4ebdb77 upstream.

Setting GPIO direction = high, sometimes results in GPIO value = 0.

If a GPIO is pulled high, the following construction results in the
value being 0 when the desired value is 1:

$ echo "high" > /sys/class/gpio/gpio336/direction
$ cat /sys/class/gpio/gpio336/value
0

Before the GPIO direction is changed from an input to an output,
exar_set_value() is called with value = 1, but since the GPIO is an
input when exar_set_value() is called, _regmap_update_bits() reads a 1
due to an external pull-up.  regmap_set_bits() sets force_write =
false, so the value (1) is not written.  When the direction is then
changed, the GPIO becomes an output with the value of 0 (the hardware
default).

regmap_write_bits() sets force_write = true, so the value is always
written by exar_set_value() and an external pull-up doesn't affect the
outcome of setting direction = high.

The same can happen when a GPIO is pulled low, but the scenario is a
little more complicated.

$ echo high > /sys/class/gpio/gpio351/direction
$ cat /sys/class/gpio/gpio351/value
1

$ echo in > /sys/class/gpio/gpio351/direction
$ cat /sys/class/gpio/gpio351/value
0

$ echo low > /sys/class/gpio/gpio351/direction
$ cat /sys/class/gpio/gpio351/value
1

Fixes: 36fb7218e878 ("gpio: exar: switch to using regmap")
Co-developed-by: Matthew McClain <mmcclain@xxxxxxxxxxx>
Signed-off-by: Matthew McClain <mmcclain@xxxxxxxxxxx>
Signed-off-by: Sai Kumar Cholleti <skmr537@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20241105071523.2372032-1-skmr537@xxxxxxxxx
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpio/gpio-exar.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/gpio/gpio-exar.c
+++ b/drivers/gpio/gpio-exar.c
@@ -99,11 +99,13 @@ static void exar_set_value(struct gpio_c
 	struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
 	unsigned int addr = exar_offset_to_lvl_addr(exar_gpio, offset);
 	unsigned int bit = exar_offset_to_bit(exar_gpio, offset);
+	unsigned int bit_value = value ? BIT(bit) : 0;
 
-	if (value)
-		regmap_set_bits(exar_gpio->regmap, addr, BIT(bit));
-	else
-		regmap_clear_bits(exar_gpio->regmap, addr, BIT(bit));
+	/*
+	 * regmap_write_bits() forces value to be written when an external
+	 * pull up/down might otherwise indicate value was already set.
+	 */
+	regmap_write_bits(exar_gpio->regmap, addr, BIT(bit), bit_value);
 }
 
 static int exar_direction_output(struct gpio_chip *chip, unsigned int offset,






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