[Openchrome-devel] [Bug 94473] DRM / KMS bootup error on VX900 platform

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94473

--- Comment #25 from Kevin Brace <kevinbrace at gmx.com> ---
(In reply to HuangRan from comment #22)

Hi Frank,

> With further kernel debugging, we found that in via_driver_load() function,
> it has the code as below:
> #if __OS_HAS_AGP
> 	if ((dev_priv->engine_type > VIA_ENG_H2) ||
> 	    (dev->agp && drm_pci_device_is_agp(dev))) {
> 		ret = via_detect_agp(dev);
> 		if (!ret)
> 			via_agp_engine_init(dev_priv);
> 		else
> 			DRM_ERROR("Failed to allocate AGP\n");
> 	}
> #endif
> 
> Actually dev->agp is NULL for VX900. But because dev_priv->engine_type value
> is greater than VIA_ENG_H2, via_detect_agp() is called.
> I am not sure what does engine_type mean? Can anybody give some comments?
> And why is it related to AGP detect?
> 
> Thanks,
> Frank

I think (dev_priv->engine_type > VIA_ENG_H2) means K8M890 or later (i.e., The
integrated graphics is Chrome 9 or later 3D engine.).
It appears that K8M890 was the first chipset to implement Chrome 9 graphics.
Chrome 9 graphics' 3D engine is rumored to be borrowed from S3 Graphics
DeltaChrome.
DeltaChrome is a 130 nm process AGP graphics chip that came out in 2003 / 2004.
A few vendors sold graphics card based on it.
It is very rare to find, but I do own one copy of it (It was made by VIA
Technologies itself.).

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