linux-kernel - [PATCH 3.16.y-ckt 003/254] pinctrl: baytrail: show output gpio state correctly on Intel Baytrail

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Date:	Tue, 25 Nov 2014 10:35:53 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 003/254] pinctrl: baytrail: show output gpio state correctly on Intel Baytrail

3.16.7-ckt2 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Cohen <david.a.cohen@...ux.intel.com>

commit d90c33818967c5e5371961604ad98b4dea4fa3f4 upstream.

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: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
Reviewed-by: Felipe Balbi <balbi@...com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/pinctrl/pinctrl-baytrail.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-baytrail.c b/drivers/pinctrl/pinctrl-baytrail.c
index 975572e2f260..ecbfec9e54d9 100644
--- a/drivers/pinctrl/pinctrl-baytrail.c
+++ b/drivers/pinctrl/pinctrl-baytrail.c
@@ -310,7 +310,7 @@ static int byt_gpio_direction_output(struct gpio_chip *chip,
 	spin_lock_irqsave(&vg->lock, flags);
 
 	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);
-- 
2.1.0

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