Re: [PATCH 1/2] gpio: omap: prepare and unprepare the debounce clock

[Rajendra Nayak <rnayak@ti.com>]

On Wednesday 23 April 2014 11:41 AM, Rajendra Nayak wrote:
> Replace the clk_enable()s with a clk_prepare_enable() and
> the clk_disables()s with a clk_disable_unprepare()
> 
> This never showed issues due to the OMAP platform code (hwmod)
> leaving these clocks in clk_prepare()ed state by default.
> 
> Reported-by: Kishon Vijay Abraham I <kishon@ti.com>
> Signed-off-by: Rajendra Nayak <rnayak@ti.com>
> Cc: linux-gpio@vger.kernel.org
> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
> Cc: Kevin Hilman <khilman@deeprootsystems.com>

Linus,

Do you mind picking this fix up via the GPIO tree? Alternatively you could
Ack this if you are fine and we can take both Patch 1/2 and Patch 2/2 from this
series via the OMAP tree.

Patch 2/2 has a dependency on Patch 1/2 and they need to go in in that order else
gpio would break. More discussions are here [1].
Let us know what you think. Thanks.

regards,
Rajendra

[1] http://www.mail-archive.com/linux-gpio@vger.kernel.org/msg02801.html

> ---
>  drivers/gpio/gpio-omap.c |   10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> index 19b886c..78bc5a4 100644
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -180,7 +180,7 @@ static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
>  static inline void _gpio_dbck_enable(struct gpio_bank *bank)
>  {
>  	if (bank->dbck_enable_mask && !bank->dbck_enabled) {
> -		clk_enable(bank->dbck);
> +		clk_prepare_enable(bank->dbck);
>  		bank->dbck_enabled = true;
>  
>  		writel_relaxed(bank->dbck_enable_mask,
> @@ -198,7 +198,7 @@ static inline void _gpio_dbck_disable(struct gpio_bank *bank)
>  		 */
>  		writel_relaxed(0, bank->base + bank->regs->debounce_en);
>  
> -		clk_disable(bank->dbck);
> +		clk_disable_unprepare(bank->dbck);
>  		bank->dbck_enabled = false;
>  	}
>  }
> @@ -231,7 +231,7 @@ static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
>  
>  	l = GPIO_BIT(bank, gpio);
>  
> -	clk_enable(bank->dbck);
> +	clk_prepare_enable(bank->dbck);
>  	reg = bank->base + bank->regs->debounce;
>  	writel_relaxed(debounce, reg);
>  
> @@ -245,7 +245,7 @@ static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
>  	bank->dbck_enable_mask = val;
>  
>  	writel_relaxed(val, reg);
> -	clk_disable(bank->dbck);
> +	clk_disable_unprepare(bank->dbck);
>  	/*
>  	 * Enable debounce clock per module.
>  	 * This call is mandatory because in omap_gpio_request() when
> @@ -290,7 +290,7 @@ static void _clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
>  		bank->context.debounce = 0;
>  		writel_relaxed(bank->context.debounce, bank->base +
>  			     bank->regs->debounce);
> -		clk_disable(bank->dbck);
> +		clk_disable_unprepare(bank->dbck);
>  		bank->dbck_enabled = false;
>  	}
>  }
>