From: Roger Quadros Date: Fri, 3 Apr 2009 07:32:20 +0000 (+0300) Subject: GPIO: OMAP: Fixed spurious IRQ issue for GPIO interrupts X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=da502fced01eef3610209b7bfb0eed7cc97fdac0;p=linux-2.6-omap-h63xx.git GPIO: OMAP: Fixed spurious IRQ issue for GPIO interrupts Flush posted write to IRQSTATUS register in GPIO IRQ handler. This eliminates the below error for all peripherals that use GPIO interrupts. <4>Spurious irq 95: 0xffffffdf, please flush posted write for irq 31 Signed-off-by: Roger Quadros Signed-off-by: Tony Lindgren --- diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c index 210a1c04555..17d7afe42b8 100644 --- a/arch/arm/plat-omap/gpio.c +++ b/arch/arm/plat-omap/gpio.c @@ -758,8 +758,12 @@ static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask) /* Workaround for clearing DSP GPIO interrupts to allow retention */ #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX) + reg = bank->base + OMAP24XX_GPIO_IRQSTATUS2; if (cpu_is_omap24xx() || cpu_is_omap34xx()) - __raw_writel(gpio_mask, bank->base + OMAP24XX_GPIO_IRQSTATUS2); + __raw_writel(gpio_mask, reg); + + /* Flush posted write for the irq status to avoid spurious interrupts */ + __raw_readl(reg); #endif }