From: viresh kumar <viresh.kumar@st.com>
Date: Wed, 21 Apr 2010 08:42:05 +0000 (+0100)
Subject: ARM: 6060/1: PL061 GPIO: Setting gpio val after changing direction to OUT.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=64b997c5142a13373857de09599afd2f079c2f7a;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

ARM: 6060/1: PL061 GPIO: Setting gpio val after changing direction to OUT.

pl061_direction_output doesn't set value of gpio to value passed to it.
This patch sets value of GPIO pin to requested value after changing direction
to OUT.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/drivers/gpio/pl061.c b/drivers/gpio/pl061.c
index cc3b5e0b595a..2196f318114c 100644
--- a/drivers/gpio/pl061.c
+++ b/drivers/gpio/pl061.c
@@ -91,6 +91,12 @@ static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
 	gpiodir = readb(chip->base + GPIODIR);
 	gpiodir |= 1 << offset;
 	writeb(gpiodir, chip->base + GPIODIR);
+
+	/*
+	 * gpio value is set again, because pl061 doesn't allow to set value of
+	 * a gpio pin before configuring it in OUT mode.
+	 */
+	writeb(!!value << offset, chip->base + (1 << (offset + 2)));
 	spin_unlock_irqrestore(&chip->lock, flags);
 
 	return 0;