linux-kernel - [PATCH v2] gpio: gpio-vf610: do not touch other bits when set the target bit

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Date:   Wed, 11 May 2022 10:15:04 +0800
From:   haibo.chen@....com
To:     linus.walleij@...aro.org, brgl@...ev.pl, aisheng.dong@....com
Cc:     peng.fan@....com, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-imx@....com, haibo.chen@....com
Subject: [PATCH v2] gpio: gpio-vf610: do not touch other bits when set the target bit

From: Haibo Chen <haibo.chen@....com>

For gpio controller contain register PDDR, when set one target bit,
current logic will clear all other bits, this is wrong. Use operator
'|=' to fix it.

Fixes: 659d8a62311f ("gpio: vf610: add imx7ulp support")
Reviewed-by: Peng Fan <peng.fan@....com>
Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/gpio/gpio-vf610.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c
index 20780c35da1b..23cddb265a0d 100644
--- a/drivers/gpio/gpio-vf610.c
+++ b/drivers/gpio/gpio-vf610.c
@@ -125,9 +125,13 @@ static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
 {
 	struct vf610_gpio_port *port = gpiochip_get_data(chip);
 	unsigned long mask = BIT(gpio);
+	u32 val;
 
-	if (port->sdata && port->sdata->have_paddr)
-		vf610_gpio_writel(mask, port->gpio_base + GPIO_PDDR);
+	if (port->sdata && port->sdata->have_paddr) {
+		val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
+		val |= mask;
+		vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
+	}
 
 	vf610_gpio_set(chip, gpio, value);
 
-- 
2.25.1