spitz backlight: fix brightness limiting

[Eric Miao]

On Fri, Oct 23, 2009 at 1:20 PM, Pavel Machek <pavel at ucw.cz> wrote:
> On Thu 2009-10-22 23:43:19, Richard Purdie wrote:
>> On Thu, 2009-10-22 at 04:20 +0800, Eric Miao wrote:
>> > It's a little bit weird it's called 'limit_mask' when I first converted it
>> > to a spi driver. There must be some reasons, Richard, you've got
>> > any ideas?
>>
>> Its a historical artifact that once worked through some bitfield magic
>> but probably stopped working when we increased the range of values the
>> backlight could accept and we didn't notice the limiting problem.
>>
>> I'll happily take a patch to fix that.
>
> Patch is available in the parent post. For now, I just fix it so that
> it does not turn backlight off when it should not. I'll submit
> limit_mask -> limit as separate patch, ok?

I'm fine with that. Feel free to.