diff options
| author | Chunqiu Wang <cqwang@motorola.com> | 2009-06-24 17:13:39 +0000 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-05-12 09:39:16 -0700 |
| commit | 699117a69f53efbdf8fddbd6d991575c0a22fd74 (patch) | |
| tree | a29983842587a87f5270631026dbb3406a57ad52 /arch/arm/plat-omap | |
| parent | a118b5f3391fc60e1619a79f8ceb070bb7b39b2d (diff) | |
| download | talos-obmc-linux-699117a69f53efbdf8fddbd6d991575c0a22fd74.tar.gz talos-obmc-linux-699117a69f53efbdf8fddbd6d991575c0a22fd74.zip | |
OMAP3: GPIO: Only enable WAKEUPEN for edge detection GPIOs
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>
Diffstat (limited to 'arch/arm/plat-omap')
| -rw-r--r-- | arch/arm/plat-omap/gpio.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c index 6216f4f09e82..2f185ffaca4a 100644 --- a/arch/arm/plat-omap/gpio.c +++ b/arch/arm/plat-omap/gpio.c @@ -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; |
