linux-kernel - Re: [PATCH 2/6] gpio/omap: remove saved_wakeup field from struct gpio

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Date:	Mon, 27 Feb 2012 15:50:24 -0800
From:	Kevin Hilman <khilman@...com>
To:	Tarun Kanti DebBarma <tarun.kanti@...com>
Cc:	<linux-omap@...r.kernel.org>, <grant.likely@...retlab.ca>,
	<tony@...mide.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/6] gpio/omap: remove saved_wakeup field from struct gpio_bank

Tarun Kanti DebBarma <tarun.kanti@...com> writes:

> There is no more need to have saved_wakeup. Instead we can use
> context.wake_en which holds the current wakeup enable register
> context. This also means that the read from wakeup enable register
> is not needed.
>
> Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@...com>

Looks right, but one question below...

> ---
>  drivers/gpio/gpio-omap.c |   13 ++++---------
>  1 files changed, 4 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> index 40a1fb2..64f15d5 100644
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -54,7 +54,6 @@ struct gpio_bank {
>  	u16 irq;
>  	u16 virtual_irq_start;
>  	u32 suspend_wakeup;
> -	u32 saved_wakeup;
>  	u32 non_wakeup_gpios;
>  	u32 enabled_non_wakeup_gpios;
>  	struct gpio_regs context;
> @@ -772,7 +771,7 @@ static int omap_mpuio_suspend_noirq(struct device *dev)
>  	unsigned long		flags;
>  
>  	spin_lock_irqsave(&bank->lock, flags);
> -	bank->saved_wakeup = __raw_readl(mask_reg);
> +	bank->context.wake_en = __raw_readl(mask_reg);

Why is this read needed?

Kevin

>  	__raw_writel(0xffff & ~bank->suspend_wakeup, mask_reg);
>  	spin_unlock_irqrestore(&bank->lock, flags);
>  
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