[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 #93 from Jiri Kosina <jikos at jikos.cz> ---
(In reply to comment #92)
> Created attachment 104227 [details] [review]
> 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).

This patch causes another ring initialization failure, 100%, during boot (i.e.
even no suspend-resume cycle necessary)

[    3.496122] [drm:init_ring_common] *ERROR* bsd ring initialization failed
ctl 0001f001 (valid? 1) head 00000008 tail 00000040 start 00107000 [expected
00107000]
[    3.496256] [drm:i915_gem_init] *ERROR* Failed to initialize GPU, declaring
it wedged

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