[Bug 76554] [gm45 regression] [drm:init_ring_common]: *ERROR* render ring initialization failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76554

--- Comment #92 from Daniel Vetter <daniel at ffwll.ch> ---
Created attachment 104227
  --> https://bugs.freedesktop.org/attachment.cgi?id=104227&action=edit
head start before enabling

Another crazy idea. Looking at logs and Jiri's patch, the critical step seems
to be when we set the valid bit. Let's see what happens if we give the ring a
headstart, hopefully catching the moving ring.

You can experiment with different values, as long as they're a multiple of 8.
64 might be magic since it's the cacheline size (which in a few w/a is really
important for register writes, even though that's strange).

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