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authorEero Nurkkala <ext-eero.nurkkala@nokia.com>2009-08-28 19:51:36 +0200
committerTony Lindgren <tony@atomide.com>2009-08-28 19:51:36 +0200
commit82dbb9d39f58e3d12b5903764901df5fec759daf (patch)
treea08cd7f70a69e70df94e37fc1df6ea062a6ec61c /arch/arm/plat-omap/gpio.c
parentOMAP: Remove omap boot parsing code (diff)
downloadlinux-82dbb9d39f58e3d12b5903764901df5fec759daf.tar.xz
linux-82dbb9d39f58e3d12b5903764901df5fec759daf.zip
OMAP: GPIO: Avoid generating extra IRQs
It is possible for GPIO IRQ lines configured with falling edge triggering only to get IRQs at the rising edge upon the exit of offmode. And vice versa. Prevent such IRQs to arrive by generating the IRQ obeying the detection scheme. Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/plat-omap/gpio.c')
-rw-r--r--arch/arm/plat-omap/gpio.c27
1 files changed, 23 insertions, 4 deletions
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index b55b4adffbe7..7c70a6afcf66 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -1895,7 +1895,7 @@ void omap2_gpio_resume_after_retention(void)
return;
for (i = 0; i < gpio_bank_count; i++) {
struct gpio_bank *bank = &gpio_bank[i];
- u32 l;
+ u32 l, gen, gen0, gen1;
if (!(bank->enabled_non_wakeup_gpios))
continue;
@@ -1916,14 +1916,33 @@ void omap2_gpio_resume_after_retention(void)
#endif
l ^= bank->saved_datain;
l &= bank->non_wakeup_gpios;
- if (l) {
+
+ /*
+ * No need to generate IRQs for the rising edge for gpio IRQs
+ * configured with falling edge only; and vice versa.
+ */
+ gen0 = l & bank->saved_fallingdetect;
+ gen0 &= bank->saved_datain;
+
+ gen1 = l & bank->saved_risingdetect;
+ gen1 &= ~(bank->saved_datain);
+
+ /* FIXME: Consider GPIO IRQs with level detections properly! */
+ gen = l & (~(bank->saved_fallingdetect) &
+ ~(bank->saved_risingdetect));
+ /* Consider all GPIO IRQs needed to be updated */
+ gen |= gen0 | gen1;
+
+ if (gen) {
u32 old0, old1;
#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX) || \
defined(CONFIG_ARCH_OMAP4)
old0 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0);
old1 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
- __raw_writel(old0 | l, bank->base + OMAP24XX_GPIO_LEVELDETECT0);
- __raw_writel(old1 | l, bank->base + OMAP24XX_GPIO_LEVELDETECT1);
+ __raw_writel(old0 | gen, bank->base +
+ OMAP24XX_GPIO_LEVELDETECT0);
+ __raw_writel(old1 | gen, bank->base +
+ OMAP24XX_GPIO_LEVELDETECT1);
__raw_writel(old0, bank->base + OMAP24XX_GPIO_LEVELDETECT0);
__raw_writel(old1, bank->base + OMAP24XX_GPIO_LEVELDETECT1);
#endif