From: Hiroshi DOYU Date: Mon, 25 Sep 2006 09:41:46 +0000 (+0300) Subject: ARM: OMAP: GPIO: IRQSTATUS2 workaround for retention state X-Git-Tag: v2.6.19-rc1~885^2~18^2~7 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bee7930f4aa501de4e3c793640c3af31fd3867e2;p=linux-2.6 ARM: OMAP: GPIO: IRQSTATUS2 workaround for retention state In OMAP2420, an incoming GPIO interrupt always sets both GPIO_IRQSTATUS1 and GPIO_IRQSTATUS2, even if the relevant bit is disabled in GPIO_IRQENABLE1/2 and DSP doesn't use GPIO at all. GPIO_IRQSTATUS1 is for MPU and GPIO_IRQSTATUS2 is for DSP. If IRQSTATUS is set, this will prevent the system from going to idle state. This patch also clears IRQSTATUS2 to avoid the above situation. Signed-off-by: Hiroshi DOYU Signed-off-by: Juha Yrjola Signed-off-by: Tony Lindgren --- diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c index f7f929a14b..f1aaa5519c 100644 --- a/arch/arm/plat-omap/gpio.c +++ b/arch/arm/plat-omap/gpio.c @@ -94,6 +94,8 @@ #define OMAP24XX_GPIO_SYSCONFIG 0x0010 #define OMAP24XX_GPIO_SYSSTATUS 0x0014 #define OMAP24XX_GPIO_IRQSTATUS1 0x0018 +#define OMAP24XX_GPIO_IRQSTATUS2 0x0028 +#define OMAP24XX_GPIO_IRQENABLE2 0x002c #define OMAP24XX_GPIO_IRQENABLE1 0x001c #define OMAP24XX_GPIO_CTRL 0x0030 #define OMAP24XX_GPIO_OE 0x0034 @@ -529,6 +531,10 @@ static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask) return; } __raw_writel(gpio_mask, reg); + + /* Workaround for clearing DSP GPIO interrupts to allow retention */ + if (cpu_is_omap2420()) + __raw_writel(gpio_mask, bank->base + OMAP24XX_GPIO_IRQSTATUS2); } static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)