https://bugs.freedesktop.org/show_bug.cgi?id=94473
--- Comment #23 from Kevin Brace <kevinbr...@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
H2 or H6 appears to be the DMA engine revision.
https://www.freedesktop.org/wiki/Openchrome/DMAEngineNotes/
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