linux-kernel - [PATCH 3.19.y-ckt 143/160] pinctrl: bcm2835: Fix initial value for direction

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Message-Id: <1453252038-31915-144-git-send-email-kamal@canonical.com>
Date:	Tue, 19 Jan 2016 17:07:01 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Stefan Wahren <stefan.wahren@...e.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Luis Henriques <luis.henriques@...onical.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 143/160] pinctrl: bcm2835: Fix initial value for direction_output

3.19.8-ckt13 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Stefan Wahren <stefan.wahren@...e.com>

commit 4c02cba18cc9de672a554ddda4f23dec8cb4b48e upstream.

Currently the provided initial value for bcm2835_gpio_direction_output
has no effect. So fix this issue by changing the value before
changing the GPIO direction. As a result we need to move the function below
bcm2835_gpio_set.

Suggested-by: Martin Sperl <kernel@...tin.sperl.org>
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Acked-by: Eric Anholt <eric@...olt.net>
Acked-by: Stephen Warren <swarren@...dotorg.org>
Fixes: e1b2dc70cd5b ("pinctrl: add bcm2835 driver")
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
[ luis: backported to 3.16:
  - file rename: drivers/pinctrl/bcm/pinctrl-bcm2835.c ->
    drivers/pinctrl/pinctrl-bcm2835.c ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/pinctrl/pinctrl-bcm2835.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-bcm2835.c b/drivers/pinctrl/pinctrl-bcm2835.c
index 9aa8a3f..752cd43 100644
--- a/drivers/pinctrl/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/pinctrl-bcm2835.c
@@ -352,12 +352,6 @@ static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
 	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
 }
 
-static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
-		unsigned offset, int value)
-{
-	return pinctrl_gpio_direction_output(chip->base + offset);
-}
-
 static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
@@ -365,6 +359,13 @@ static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
 }
 
+static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
+		unsigned offset, int value)
+{
+	bcm2835_gpio_set(chip, offset, value);
+	return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
 static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 {
 	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-- 
1.9.1