linux-kernel - Re: [PATCH 2/9] backlight: atmel-pwm-bl: fix gpio polarity in remove

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Date:	Fri, 25 Oct 2013 13:09:28 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Johan Hovold <jhovold@...il.com>
Cc:	Richard Purdie <rpurdie@...ys.net>,
	Jingoo Han <jg1.han@...sung.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH 2/9] backlight: atmel-pwm-bl: fix gpio polarity in remove

On 11:55 Wed 23 Oct     , Johan Hovold wrote:
> Make sure to honour gpio polarity also at remove so that the backlight
> is actually disabled on boards with active-low enable pin.
> 
> Cc: stable@...r.kernel.org
> Acked-by: Jingoo Han <jg1.han@...sung.com>
> Signed-off-by: Johan Hovold <jhovold@...il.com>
> ---
>  drivers/video/backlight/atmel-pwm-bl.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/backlight/atmel-pwm-bl.c b/drivers/video/backlight/atmel-pwm-bl.c
> index 8aac273..3cb0094 100644
> --- a/drivers/video/backlight/atmel-pwm-bl.c
> +++ b/drivers/video/backlight/atmel-pwm-bl.c
> @@ -205,8 +205,10 @@ static int atmel_pwm_bl_remove(struct platform_device *pdev)
>  {
>  	struct atmel_pwm_bl *pwmbl = platform_get_drvdata(pdev);
>  
> -	if (pwmbl->gpio_on != -1)
> -		gpio_set_value(pwmbl->gpio_on, 0);
> +	if (pwmbl->gpio_on != -1) {
here we need to use gpio_is_valid
> +		gpio_set_value(pwmbl->gpio_on,
> +					0 ^ pwmbl->pdata->on_active_low);
> +	}
>  	pwm_channel_disable(&pwmbl->pwmc);
>  	pwm_channel_free(&pwmbl->pwmc);
>  
> -- 
> 1.8.4
> 
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