linux-kernel - [PATCH] OMAP3 GPIO: Fix getting the value of the GPIO output pin

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Date:	Sat, 7 Feb 2009 13:15:25 +0900
From:	Joonyoung Shim <dofmind@...il.com>
To:	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org
Cc:	linux-omap@...r.kernel.org, Tony Lindgren <tony@...mide.com>
Subject: [PATCH] OMAP3 GPIO: Fix getting the value of the GPIO output pin

If the GPIO pin is output, must read the value from OMAP24XX_GPIO_DATAOUT
register in __omap_get_gpio_datain().

Signed-off-by: Joonyoung Shim <jy0922.shim@...sung.com>
---

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index f856a90..296773a 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -428,7 +428,11 @@ static int __omap_get_gpio_datain(int gpio)
 #endif
 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
 	case METHOD_GPIO_24XX:
-		reg += OMAP24XX_GPIO_DATAIN;
+		if (__raw_readl(reg + OMAP24XX_GPIO_OE)
+					& (1 << get_gpio_index(gpio)))
+			reg += OMAP24XX_GPIO_DATAIN;
+		else
+			reg += OMAP24XX_GPIO_DATAOUT;
 		break;
 #endif
 	default:
--
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