linux-kernel - Re: [PATCH RFT] leds: lp8788: Fix updating scale configuration bits

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Message-ID: <CAK5ve-+dvpQqj1q9QF8nfST0Ff=W7WCO=_jYdGi7gOjsWO+93w@mail.gmail.com>
Date:	Tue, 7 Aug 2012 10:07:27 +0800
From:	Bryan Wu <bryan.wu@...onical.com>
To:	"Milo(Woogyom) Kim" <milo.kim@...com>,
	Axel Lin <axel.lin@...il.com>
Cc:	Richard Purdie <rpurdie@...ys.net>, linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFT] leds: lp8788: Fix updating scale configuration bits

On Wed, Aug 1, 2012 at 8:40 PM, Axel Lin <axel.lin@...il.com> wrote:
> We need to do left shift (cfg->num + LP8788_ISINK_SCALE_OFFSET) bits for
> updating scale configuration.
>
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
> Hi Milo,
> Current code of updating scale configuration bits looks wrong to me
> because the mask does not match the val.
> I don't have this hardware, can you test this patch?
>

Milo, I think this patch from Axel is reasonable. could you please
take a look at this?

-Bryan

> Thanks,
> Axel
>  drivers/leds/leds-lp8788.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/leds/leds-lp8788.c b/drivers/leds/leds-lp8788.c
> index 53bd136..0ade6eb 100644
> --- a/drivers/leds/leds-lp8788.c
> +++ b/drivers/leds/leds-lp8788.c
> @@ -63,7 +63,7 @@ static int lp8788_led_init_device(struct lp8788_led *led,
>         /* scale configuration */
>         addr = LP8788_ISINK_CTRL;
>         mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
> -       val = cfg->scale << cfg->num;
> +       val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
>         ret = lp8788_update_bits(led->lp, addr, mask, val);
>         if (ret)
>                 return ret;
> --
> 1.7.9.5
>
>
>



-- 
Bryan Wu <bryan.wu@...onical.com>
Kernel Developer    +86.186-168-78255 Mobile
Canonical Ltd.      www.canonical.com
Ubuntu - Linux for human beings | www.ubuntu.com
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