[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 #82 from Jiri Kosina <jikos at jikos.cz> ---
Created attachment 104216
  --> https://bugs.freedesktop.org/attachment.cgi?id=104216&action=edit
dmesg of 3.16 + patch from comment #80

Woohooo! Daniel, your patch from comment #80 seems to make the bug go away!

Attached is dmesg from 3.16 + patch from comment #80. No more ring
initialization errors in dmesg, everything working properly.

I'll do a couple more suspend/resume cycles to be sure that the problem just
doesn't happen less frequently and will report back.

So either it's the wait_for_atomic() -> wait_for() change, the extra wait_for()
added in order to wait for the head to be cleared, or the extra
I915_READ_HEAD() reads inserted.

Unless you now have a clear idea of what's happening, I'll try to isolate which
of the changes in the patch is the one that makes the difference.

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