[PATCH 6.12 04/24] pinctrl: armada-37xx: set GPIO output value before setting direction

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

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

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

From: Gabor Juhos <j4g8y7@gmail.com>

commit e6ebd4942981f8ad37189bbb36a3c8495e21ef4c upstream.

Changing the direction before updating the output value in the
OUTPUT_VAL register may result in a glitch on the output line
if the previous value in the OUTPUT_VAL register is different
from the one we want to set.

In order to avoid that, update the output value before changing
the direction.

Cc: stable@vger.kernel.org
Fixes: 6702abb3bf23 ("pinctrl: armada-37xx: Fix direction_output() callback behavior")
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Link: https://lore.kernel.org/20250514-pinctrl-a37xx-fixes-v2-2-07e9ac1ab737@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/pinctrl/mvebu/pinctrl-armada-37xx.c |   15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

--- a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
@@ -417,23 +417,22 @@ static int armada_37xx_gpio_direction_ou
 					     unsigned int offset, int value)
 {
 	struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
-	unsigned int val_offset = offset;
-	unsigned int reg = OUTPUT_EN;
+	unsigned int en_offset = offset;
+	unsigned int reg = OUTPUT_VAL;
 	unsigned int mask, val, ret;
 
 	armada_37xx_update_reg(&reg, &offset);
 	mask = BIT(offset);
+	val = value ? mask : 0;
 
-	ret = regmap_update_bits(info->regmap, reg, mask, mask);
-
+	ret = regmap_update_bits(info->regmap, reg, mask, val);
 	if (ret)
 		return ret;
 
-	reg = OUTPUT_VAL;
-	armada_37xx_update_reg(&reg, &val_offset);
+	reg = OUTPUT_EN;
+	armada_37xx_update_reg(&reg, &en_offset);
 
-	val = value ? mask : 0;
-	regmap_update_bits(info->regmap, reg, mask, val);
+	regmap_update_bits(info->regmap, reg, mask, mask);
 
 	return 0;
 }