[Openchrome-devel] [Bug 94528] HDMI port is not working on current KMS driver with VX900 platform

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94528

--- Comment #3 from Kevin Brace <kevinbrace at gmx.com> ---
(In reply to HuangRan from comment #2)

Hi Frank,

> (In reply to Kevin Brace from comment #1)
> > Hi Frank,
> > 
> > Interesting that the DRM or DDX is recognizing the HDMI monitor.
> > 
> > ________________________________________________________________
> > . . .
> > 
> > [    91.005] (II) CHROME(0): EDID for output DVI-0
> > [    91.005] (II) CHROME(0): Output VGA-0 disconnected
> > [    91.005] (II) CHROME(0): Output HDMI-0 connected
> > [    91.005] (II) CHROME(0): Output DVI-0 disconnected
> > [    91.005] (II) CHROME(0): Using exact sizes for initial modes
> > [    91.005] (II) CHROME(0): Output HDMI-0 using initial mode 1920x1080 +0+0
> > . . .
> > ________________________________________________________________
> 
> Yup, Kevin. I see that. And I found EDID information is probed out by the
> driver. So we need see what happened that lead no display on the monitor.
> 
> Thanks,
> Frank

The weird thing about VX900 chipset hardware programming documentation is that
it contains register information for DisplayPort, but not HDMI.
I do not know how James Simmons wrote the code, if the above assumption is
true.
That being said, VIA Technologies does have a quasi-open source 2D device
driver code on their website for Chrome 9 family.

http://download.viatech.com/en/support/driversSelect.jsp

Select "Linux (current)" and VX900 chipset.
At least for the DRM module which supports KMS, it is open source.
Check out via_chrome9_hdac_renew.c where it is apparently accessing the
registers related to HDMI.

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