gpio: omap: fix clk_prepare/unprepare usage

As per CCF documentation (clk.txt) the clk_prepare/unprepare APIs
are not allowed in atomic context. But now OMAP GPIO driver
uses them while applying debounce settings and as part
of PM runtime irqsafe operations:

- omap_gpio_debounce() is holding the lock with IRQs off.
  + omap2_set_gpio_debounce()
   + clk_prepare_enable()
    + clk_prepare() this one might sleep.

- pm_runtime_get_sync() is holding the lock with IRQs off
  + omap_gpio_runtime_suspend()
    + raw_spin_lock_irqsave()
    + omap_gpio_dbck_disable()
      + clk_disable_unprepare()

Hence, fix it by moeving dbclk prepare/unprepare in OMAP GPIO
omap_gpio_probe/omap_gpio_remove. Also, while here, ensure that
debounce functionality is disabled if clk_get() failed,
because otherwise kernel will carsh in omap2_set_gpio_debounce().

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 18 insertions, 9 deletions

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 1f02acd577e3..2ae0d47e9554 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -176,7 +176,7 @@ static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set
 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
 {
         if (bank->dbck_enable_mask && !bank->dbck_enabled) {
-                clk_prepare_enable(bank->dbck);
+                clk_enable(bank->dbck);
                 bank->dbck_enabled = true;
 
                 writel_relaxed(bank->dbck_enable_mask,
@@ -194,7 +194,7 @@ static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
                  */
                 writel_relaxed(0, bank->base + bank->regs->debounce_en);
 
-                clk_disable_unprepare(bank->dbck);
+                clk_disable(bank->dbck);
                 bank->dbck_enabled = false;
         }
 }
@@ -227,7 +227,7 @@ static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
 
         l = BIT(offset);
 
-        clk_prepare_enable(bank->dbck);
+        clk_enable(bank->dbck);
         reg = bank->base + bank->regs->debounce;
         writel_relaxed(debounce, reg);
 
@@ -241,7 +241,7 @@ static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
         bank->dbck_enable_mask = val;
 
         writel_relaxed(val, reg);
-        clk_disable_unprepare(bank->dbck);
+        clk_disable(bank->dbck);
         /*
          * Enable debounce clock per module.
          * This call is mandatory because in omap_gpio_request() when
@@ -286,7 +286,7 @@ static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
                 bank->context.debounce = 0;
                 writel_relaxed(bank->context.debounce, bank->base +
                              bank->regs->debounce);
-                clk_disable_unprepare(bank->dbck);
+                clk_disable(bank->dbck);
                 bank->dbck_enabled = false;
         }
 }
@@ -1070,10 +1070,6 @@ static void omap_gpio_mod_init(struct gpio_bank *bank)
          /* Initialize interface clk ungated, module enabled */
         if (bank->regs->ctrl)
                 writel_relaxed(0, base + bank->regs->ctrl);
-
-        bank->dbck = clk_get(bank->dev, "dbclk");
-        if (IS_ERR(bank->dbck))
-                dev_err(bank->dev, "Could not get gpio dbck\n");
 }
 
 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
@@ -1234,6 +1230,17 @@ static int omap_gpio_probe(struct platform_device *pdev)
                 return PTR_ERR(bank->base);
         }
 
+        if (bank->dbck_flag) {
+                bank->dbck = devm_clk_get(bank->dev, "dbclk");
+                if (IS_ERR(bank->dbck)) {
+                        dev_err(bank->dev,
+                                "Could not get gpio dbck. Disable debounce\n");
+                        bank->dbck_flag = false;
+                } else {
+                        clk_prepare(bank->dbck);
+                }
+        }
+
         platform_set_drvdata(pdev, bank);
 
         pm_runtime_enable(bank->dev);
@@ -1265,6 +1272,8 @@ static int omap_gpio_remove(struct platform_device *pdev)
         list_del(&bank->node);
         gpiochip_remove(&bank->chip);
         pm_runtime_disable(bank->dev);
+        if (bank->dbck_flag)
+                clk_unprepare(bank->dbck);
 
         return 0;
 }