linux-kernel - Re: [PATCH] gpio: pch_gpio: Fix output value of pch_gpio_direction

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Date:	Thu, 31 Mar 2011 15:17:52 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Peter Tyser <ptyser@...-inc.com>
Cc:	linux-kernel@...r.kernel.org,
	Tomoya MORINAGA <tomoya-linux@....okisemi.com>,
	Toshiharu Okada <toshiharu-linux@....okisemi.com>
Subject: Re: [PATCH] gpio: pch_gpio: Fix output value of
 pch_gpio_direction_output()

On Fri, Mar 25, 2011 at 10:04:00AM -0500, Peter Tyser wrote:
> The pch_gpio_direction_output() function was missing a write to set the
> desired output value.  The function would properly set the GPIO
> direction, but not the output value.  The value would have to manually
> be set with a follow up call to pch_gpio_set().
> 
> Add the missing write so that pch_gpio_direction_output() sets both the
> GPIO direction and value.
> 
> Signed-off-by: Peter Tyser <ptyser@...-inc.com>
> Cc: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
> Cc: Toshiharu Okada <toshiharu-linux@....okisemi.com>
> Cc: Grant Likely <grant.likely@...retlab.ca>

Applied, thanks.

g.
> ---
> Just noticed this driver has the same bug.  This file looks nearly identical
> to ml_ioh_gpio.c.  They could likely be combined with minimal effort.
> 
>  drivers/gpio/pch_gpio.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpio/pch_gpio.c b/drivers/gpio/pch_gpio.c
> index c59d953..fa52862 100644
> --- a/drivers/gpio/pch_gpio.c
> +++ b/drivers/gpio/pch_gpio.c
> @@ -105,6 +105,7 @@ static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
>  		reg_val |= (1 << nr);
>  	else
>  		reg_val &= ~(1 << nr);
> +	iowrite32(reg_val, &chip->reg->po);
>  
>  	mutex_unlock(&chip->lock);
>  
> -- 
> 1.7.0.4
> 
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