[RFC][PATCH] Disintegrate sharpsl_param.c

[Marko Katić]

On Fri, Aug 24, 2012 at 1:25 PM, Cyril Hrubis <metan at ucw.cz> wrote:
> Hi!
>> > > I recently tried running 3.6-rc2 kernel on my Sharp Zaurus C-1000. It
>> > > hanged almost immediately after uncompressing the kernel. I tracked the
>> > > problem down to a single line in arch/arm/common/sharpsl_param.c:
>> > >
>> > > memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info));
>> > >
>> > > Commenting out the line makes the kernel boot just fine. This left me
>> > > wondering whether sharpsl_param.c is actually needed. Here's a comment
>> > > from sharpsl_param.c that describes what sharpsl_param.c actually does:
>> >
>> > Sharp went to the trouble of saving these values into the hardware and
>> > passing them into the drivers. They're basically used by the LCD
>> > initialisation code from what I remember. I don't remember what the
>> > risks are of incorrect values.
>>
>> We were seeing strange flicker on LCD on some machines...? Particulary
>> metan's machine with wifi on did that. OTOH it looked like some kind
>> of DMA issue.
>
> Yes, the problems with my LCD are DMA related (too much DMA to wifi cf card
> causes timing issues on display refresh). When there is no network activity
> it's okay.
>
> And as far as I remeber there are some magic values needed for the LCD in order
> not to have distorted picture (blurred, etc.) There is a callibration program
> in the service menu that allows you to modify the values stored in the flash.
>
> I remeber Stanislav did some research on that (CCing).
>
> --
> metan