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OMAP: GPIO: ensure debounce clocks are disabled during idle/suspend 

If a GPIO bank has more than one GPIO with debounce enabled, the
debounce clock will not be fully disabled before going to
idle/suspend.

In the idle path, we just do a single clk_disable() of the bank's
debounce clock.  If there are multiple debounce-enabled GPIOs in the
bank, that clocks usage count will be > 1, so the clk_disable() will
not actually disable the clock.

So the fix is to clk_disable() for every debounce-enabled GPIO in the
bank (and an equivalent clk_enable() of course.)

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Kevin Hilman 2010-09-22 16:06:27 -07:00
parent cbf27660e6
commit 0aed043517
1 changed files with 4 additions and 2 deletions
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6
arch/arm/plat-omap/gpio.c
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@ -2085,8 +2085,9 @@ void omap2_gpio_prepare_for_idle(int power_state)
for (i = min; i < gpio_bank_count; i++) {
struct gpio_bank *bank = &gpio_bank[i];
u32 l1, l2;
int j;
if (bank->dbck_enable_mask)
for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
clk_disable(bank->dbck);
if (power_state > PWRDM_POWER_OFF)
@ -2152,8 +2153,9 @@ void omap2_gpio_resume_after_idle(void)
for (i = min; i < gpio_bank_count; i++) {
struct gpio_bank *bank = &gpio_bank[i];
u32 l, gen, gen0, gen1;
int j;
if (bank->dbck_enable_mask)
for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
clk_enable(bank->dbck);
if (!workaround_enabled)