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 <Hiroshi.DOYU@nokia.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index f7f929a14bf5..f1aaa5519cf3 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)