[PATCH v2 07/10] gpio: dw: Return output value when direction is out

[Sean Anderson <seanga2@gmail.com>]

dm_gpio_ops.get_value can be called when the gpio is either input or
output. The current dw code always returns the input value, which is
invalid if the direction is set to out.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
---
This patch was previously submitted as part of
https://patchwork.ozlabs.org/project/uboot/list/?series=161576

Changes in v2:
- Reorder changes to minimize diff

 drivers/gpio/dwapb_gpio.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/dwapb_gpio.c b/drivers/gpio/dwapb_gpio.c
index a52c9e18e3..e2970a83a8 100644
--- a/drivers/gpio/dwapb_gpio.c
+++ b/drivers/gpio/dwapb_gpio.c
@@ -69,9 +69,14 @@ static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
 static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
 {
 	struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
-	return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin));
-}
+	u32 value;
 
+	if (dwapb_gpio_get_function(dev, pin) == GPIOF_OUTPUT)
+		value = readl(plat->base + GPIO_SWPORT_DR(plat->bank));
+	else
+		value = readl(plat->base + GPIO_EXT_PORT(plat->bank));
+	return !!(value & BIT(pin));
+}
 
 static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
 {
-- 
2.26.2