[Bug 59321] S4 broken with Haswell

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=59321

--- Comment #28 from Ben Widawsky <ben at bwidawsk.net> ---
(In reply to Takashi Iwai from comment #27)
> Thanks Ben, it looks promising.  I'll try to find some time and test the
> patches.
> 
> BTW what are the magic registers 0x4194 and 0x2050?  Are they available no
> matter which GPU generation?

0x4194 has existed for some time. It's just hardcoded as a quick hack since all
the experiments with Paulo shows the render ring causing issue. See #define
RING_FAULT_REG(ring)    (0x4094 + 0x100*(ring)->id) in
drivers/gpu/drm/i915/i915_reg.h


I'm not sure how long 0x2050 has been in the HW. It's a register which is meant
for debug purposes only, and let's just say it's magic for now (you can figure
out from the code what it should be telling us).

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