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

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Date:	Tue, 29 Oct 2013 14:08:11 +0100
From:	Johan Hovold <jhovold@...il.com>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Cc:	Johan Hovold <jhovold@...il.com>,
	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 Fri, Oct 25, 2013 at 01:09:28PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> 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

That is a different issue which is fixed by patch 7/9. It doesn't make
sense to only change one of the gpio-validity tests.

Johan

> > +		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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