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OMAP3: GPIO: Only enable WAKEUPEN for edge detection GPIOs

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According to the GPIO 'Wakeup and Interrupt' section of the TRM[1],
wake-up requests can only be generated on edge transitions.

Also for OMAP3, only edge GPIOs may lose interrupts when PER enters
RET/OFF state, this is addressed by gpio prepare|resume idle functions

[1] Section 25.5.3.1 OMAP34xx_ES3.1_TRM_V_Q

Signed-off-by: Chunqiu Wang <cqwang@motorola.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Chunqiu Wang 2009-06-24 17:13:39 +00:00 committed by Kevin Hilman
parent a118b5f339
commit 699117a69f
1 changed files with 12 additions and 2 deletions
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14
arch/arm/plat-omap/gpio.c
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@ -724,7 +724,11 @@ static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio,
OMAP4_GPIO_IRQWAKEN0);
}
} else {
if (trigger != 0)
/*
* GPIO wakeup request can only be generated on edge
* transitions
*/
if (trigger & IRQ_TYPE_EDGE_BOTH)
__raw_writel(1 << gpio, bank->base
+ OMAP24XX_GPIO_SETWKUENA);
else
@ -734,7 +738,13 @@ static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio,
}
/* This part needs to be executed always for OMAP34xx */
if (cpu_is_omap34xx() || (bank->non_wakeup_gpios & gpio_bit)) {
if (trigger != 0)
/*
* Log the edge gpio and manually trigger the IRQ
* after resume if the input level changes
* to avoid irq lost during PER RET/OFF mode
* Applies for omap2 non-wakeup gpio and all omap3 gpios
*/
if (trigger & IRQ_TYPE_EDGE_BOTH)
bank->enabled_non_wakeup_gpios |= gpio_bit;
else
bank->enabled_non_wakeup_gpios &= ~gpio_bit;