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>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 1c81340ce65..c6e1de52711 100644
--- 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;