[Openchrome-users] VT1625 PAL Modes

[Roy Thompson]

Hi,

Myself and someone else posted some patches to add _some_PAL TV out modes
a couple of months ago, search the list archive.

Sorry, I don't have a chance to dig around for them right now.

I ported over a couple of the register sets from the via driver, it
seemed to work quite well.

Roy

> Re: VT1625 PAL Modes
> Hi Ken,
>
> Thanks for the info. I also found some usefull information on the TV Out
> page of Terry Barnaby
> (http://www.kingcot.eclipse.co.uk/unichrome/unichromeTvOut.html). He wrote
> a small program to control the registers of the vt1622 which can be
> downloaded from his page.
>
> I'll try you patch soon. I also have very little time, unfortunatly.
>
> Greetings,
>
> Sander.
>
>> Hi there,
>>
>> You are partially correct that you can get some help from the via
>> driver.  I did this to get the patch for the 720x480 resolution
>> partially working.
>>
>> I did also try to write a program that would read/write the register
>> values, but I2C is a huge pain and it never worked (in spite of the fact
>> that i basically just re-used code from X).  I've attached the program
>> as a starting point - if you get something working I would sure like to
>> see it, I don't have much time to work on this stuff.
>>
>> Also I've attached my latest attempt at a patch (its a diff off of the
>> latest svn).  I saw people complaining on the mailing list about no PAL
>> modes so I tried to add 720x576Over but I cannot test it.  I tested one
>> of the NTSC resolutions on this patch and it did not work, I suspect the
>> changes I made to the modelines are wrong, I'm not sure I understand
>> exactly what the pixel clock is set to in the via driver for these
>> various resolutions, and how that stuff should translate.
>>
>> hope that helps.
>>
>> cheers,
>>
>> Ken
>>
>>
>> On Tue, 2006-24-10 at 13:15 +0200, Sandeman wrote:
>> > Re: VT1625 PAL Modes
>> > Hi Alistair,
>> >
>> > I think there is a big chance that all information we need is in
>> tbl1625.h from the VIA driver source. I also think the translation to
>> the tables in the Openchrome header file is not that difficult (but I
>> could be overlooking something of course).
>> >
>> > I will investigate this further. As an experiment I'll write a small
>> program which just writes the values to the VT1625 registers and see
>> what happens. I'll keep you informed.
>> >
>> > Greetings,
>> >
>> > Sander.
>> >
>> > > Hi Sander,
>> > >
>> > > I haven't tried the via drivers, I heard they were pretty crappy! I
>> > > think i read that they're for XFree rather than X.org too, but I
>> could
>> > > be wrong.  I did download the source and have a bit of a peek.
>> Looks
>> > > like the tbl1625.h header may have what we need, but I've no idea
>> how
>> > > you'd go about translating that into entries for VT1625Table.
>> Anyone
>> > > know if this is possible?
>> > >
>> > > As I said I'm out my depth here but if someone who knows what
>> they're
>> > > doing could help I'm happy to try out patches.  As long as they
>> don't
>> > > blow up my telly :)
>> > >
>> > > Cheers,
>> > > Alistair
>> >
>> > ----
>> >
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