gpio/omap: fix irq loss while in idle with debounce on

[firefly-linux-kernel-4.4.55.git] / drivers / gpio / gpio-omap.c

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index c4ed1722734c9eadb190c0ccaa19a9c2eb3b2d39..ff213e70fa5a2b25d08142416ca193042ce45aa3 100644 (file)
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -174,12 +174,22 @@ static inline void _gpio_dbck_enable(struct gpio_bank *bank)
        if (bank->dbck_enable_mask && !bank->dbck_enabled) {
                clk_enable(bank->dbck);
                bank->dbck_enabled = true;
+
+               __raw_writel(bank->dbck_enable_mask,
+                            bank->base + bank->regs->debounce_en);
        }
 }
 
 static inline void _gpio_dbck_disable(struct gpio_bank *bank)
 {
        if (bank->dbck_enable_mask && bank->dbck_enabled) {
+               /*
+                * Disable debounce before cutting it's clock. If debounce is
+                * enabled but the clock is not, GPIO module seems to be unable
+                * to detect events and generate interrupts at least on OMAP3.
+                */
+               __raw_writel(0, bank->base + bank->regs->debounce_en);
+
                clk_disable(bank->dbck);
                bank->dbck_enabled = false;
        }