[PATCH] [rfc] drm: add some caps for userspace to discover more info for dumb KMS driver

[Dave Airlie]

> Would prefer_shadow ever be 0?
>

Yes thats for the USB and vmware type users, where the buffer is just
a main RAM buffer not in VRAM or uncached memory.


> Isn't preferred_depth just a static (non-driver-specific) preference
> list like "24, 30, 16, 15, 8" or something?  Do we not expose the list
> of supported depths somewhere else?

No we don't as we have userspace drivers that know as much as our
kernel drivers about the hw, I was tempted to go for a list,
but it gets a bit messy to enumerate, and really the generic driver
doesn't care, it just wants to pick one value for autoconfiguration,
if someone
sets a value in xorg.conf and it blows up well thats their issue and
they can pick another value.

Dave.