OMAP3: GPIO: disable GPIO debounce clocks on idle

Ensure GPIO debounce clocks are disabled when idle.  Otherwise,
clocks will prevent PER powerdomain from entering retention.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 1c81340..c6e1de5 100644 (file)
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -196,6 +196,7 @@ struct gpio_bank {
        struct gpio_chip chip;
        struct clk *dbck;
        u32 mod_usage;
+       u32 dbck_enable_mask;
 };
 
 #define METHOD_MPUIO           0
@@ -647,6 +648,7 @@ void omap_set_gpio_debounce(int gpio, int enable)
                goto done;
 
        if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
+               bank->dbck_enable_mask = val;
                if (enable)
                        clk_enable(bank->dbck);
                else
@@ -2054,6 +2056,9 @@ void omap2_gpio_prepare_for_idle(int power_state)
                struct gpio_bank *bank = &gpio_bank[i];
                u32 l1, l2;
 
+               if (bank->dbck_enable_mask)
+                       clk_disable(bank->dbck);
+
                if (power_state > PWRDM_POWER_OFF)
                        continue;
 
@@ -2118,6 +2123,9 @@ void omap2_gpio_resume_after_idle(void)
                struct gpio_bank *bank = &gpio_bank[i];
                u32 l, gen, gen0, gen1;
 
+               if (bank->dbck_enable_mask)
+                       clk_enable(bank->dbck);
+
                if (!workaround_enabled)
                        continue;