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authorviresh kumar <viresh.kumar@st.com>2010-04-21 09:42:05 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-04-22 12:30:14 +0100
commit64b997c5142a13373857de09599afd2f079c2f7a (patch)
treed6abc0a71b1e2fa283d73050a0ea45e229c930eb
parent9a99d55514d3c6bfc03e41536659d781af6998f5 (diff)
downloadlinux-64b997c5142a13373857de09599afd2f079c2f7a.tar.bz2
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>
-rw-r--r--drivers/gpio/pl061.c6
1 files changed, 6 insertions, 0 deletions
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;