[PATCH mach64] mach64: add a "DRI" option

[Mika Blanc]

2011/7/15 Matt Turner <mattst88 at gmail.com>

> Is DRI enabled by default really the right thing to do for a driver
> whose DRM components never made it upstream into the Linux kernel?
>

DRI is enabled only if the DRM module is present, which isn't in the general
case, so those who actually cared to compile the DRM module probably wants
DRI enabled by default, and those who didn't won't get DRI anyway.

Now, there may be background information missing... If I submitted this
patch, that's because I'm maintaining an updated source tarball of the
mach64 DRM module at the moment [1] and I'd like to switch between server
layouts with either DRI enabled or not in order when doing tests. Once the
DRM code would be stabilized, having DRI enabled should be the default
behavior, as with every X11 driver which support direct rendering.

[1] at http://trya.alwaysdata.net/linux, the last one builds with linux
2.6.39, GL apps works but the GPU hangs when exiting X, there's still some
work to do before proposing it to upstream.
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