linux-kernel - Re: [PATCH 1/1] LCD backlight driver using Atmel PWM driver

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Message-Id: <1216019462.7672.6.camel@localhost>
Date:	Mon, 14 Jul 2008 09:11:02 +0200
From:	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] LCD backlight driver using Atmel PWM driver

On Fri, 2008-07-11 at 12:17 -0700, Andrew Morton wrote:
> On Wed,  9 Jul 2008 15:08:06 +0200 Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com> wrote:
> 
> > +	if (bd->props.power != FB_BLANK_UNBLANK)
> > +		intensity = 0;
> > +	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +		intensity = 0;
> 
> hm, is that correct?  It is strange that two different fields can validly
> be compared with the same enumeration like this.
> 

I also found it a bit weird having two fields indicating the same, but
the header file has the following documentation:

/* Current FB Power mode (0: full on, 1..3: power saving
   modes; 4: full off), see FB_BLANK_XXX */
int power;
/* FB Blanking active? (values as for power) */
int fb_blank;

So, AFAIK, my assumptions are correct to get proper blanking?

-- 
With kind regards,
Hans-Christian Egtvedt, Applications Engineer

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