pinctrl: baytrail: show output gpio state correctly on Intel Baytrail

Even if a gpio pin is set to output, we still need to set INPUT_EN
functionality (by clearing INPUT_EN bit) to be able to read the pin's
level.

E.g. without this change, we'll always read low level state from sysfs.

Cc: <[email protected]> # v3.14+
Cc: Mathias Nyman <[email protected]>
Signed-off-by: David Cohen <[email protected]>
Reviewed-by: Felipe Balbi <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

Author: David Cohen

drivers/pinctrl/pinctrl-baytrail.c

@@ -322,7 +322,7 @@ static int byt_gpio_direction_output(struct gpio_chip *chip,
 		"Potential Error: Setting GPIO with direct_irq_en to output");
 
 	reg_val = readl(reg) | BYT_DIR_MASK;
-	reg_val &= ~BYT_OUTPUT_EN;
+	reg_val &= ~(BYT_OUTPUT_EN | BYT_INPUT_EN);
 
 	if (value)
 		writel(reg_val | BYT_LEVEL, reg);