答复: Video driver of SM502 for Xorg

[belcon]

Hi Clemens,

I came to Silicon Motion Inc since this May. So I had just put my hand on the driver for a very short time. I still knew not very much about SM502. 


> -----邮件原件-----
> 发件人: Clemens Koller [mailto:clemens.koller at anagramm.de]
> 发送时间: Tuesday, August 14, 2007 7:26 PM
> 收件人: belcon
> 抄送: xorg at lists.freedesktop.org
> 主题: Re: Video driver of SM502 for Xorg
> 
> Hi, Belcon!
> 
> Very nice to see some guys from Silicon Motion on the list!
> 
> > The driver named
> > siliconmotion_drv.so which is delivered with the package
> > xorg-x11-drv-siliconmotion is used to support chip SM712.
> 
> ...and other VGA compatible chips from Silicon Motion Inc.
> 
> > The attached
> > driver is used for SM502 which is much powerful than SM712.
> 
> The SM501 is the predecessor of the SM502.
> The SM502 is considered as compatible drop-in replacement for the SM501.
> Both are not VGA compatible and we use seperate drivers for the SM50x,
> currently maintained by Alex Deucher:
> 
> http://gitweb.freedesktop.org/?p=users/agd5f/xf86-video-
> smi501.git;a=summary

I would check the source code out to see what the difference is.

> 
>  > But this driver
> > has some bugs with SM712 currently.
> 
> There are versions out there which have the SM50x stuff added to the
> older SM7xx driver.
> I consider this as a hack... so no wonder something is broken. ;-)
> 
>  > I am still working on it. Since SMI got
> > several kinds chipsets, I would re-design the whole driver architecture
> so
> > that all chipsets would be supported in one driver.
> 
> Please don't re-invent the wheel again. See the *siliconmotion and *501
> drivers in the git repository:
> http://gitweb.freedesktop.org/
> 

Sure. I would base my codes on that driver. I am still a newbie to X driver development. Hopefully I can learn much from this driver. :)


> > Please test the driver if you are interested. Don't hesitate to mail me
> all
> > bugs that you found.
> 
> I have to workaround the bug that I cannot use the SM501/SM502 32bit RGBA
> modes
> on PCI on PowerPC (big endian architecture) without need to swap the
> colors

Sorry, I got no PowerPC. If I got any information about this, I would post it to this mail-list.

> in software. Is there any way to change the color planes in the SM50x?
> (I have a solution in software, but when it's about to do proper sub-pixel
> aliasing on TFT, things are messed up...)

According to my knowledge, "Palette RAM Registers" should play this game. (MMIO_base + 0x80400 ~ 0x80ffc) Not sure that is what you want.

> 
> Hardware is up and running on my side. I'm welcome to receive patches
> against the smi501 driver.
> 
> > I am sorry if my poor English annoyed you since I am
> > not an English-native Speaker.
> 
> You are very welcome. Please check the already available drivers.
> It is not planned to merge both as far as I can tell.

That's fine. But I still need to work on that since my manager want that. //shrug

> 
> Regards,
> --
> Clemens Koller
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Regards
  Belcon