[Bug 52411] [snb] intel gpu never go in rc6 after suspend

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=52411





--- Comment #8 from Alexander Bersenev <bay at hackerdom.ru>  2013-01-10 10:48:50 ---
May be, how follows from commit:

  I915_WRITE_NOTRACE(FORCEWAKE, 1);
- POSTING_READ(ECOBUS); /* something from same cacheline, but !FORCEWAKE */
+ POSTING_READ(FORCEWAKE);

driver should read something from same cacheline after writing to FORCEWAKE
register, but in another place:

- /* gen6_gt_check_fifodbg doubles as the POSTING_READ */
+ POSTING_READ(FORCEWAKE); 
  gen6_gt_check_fifodbg(dev_priv);

it is said that gen6_gt_check_fifodbg doing POSING_READ, but
gen6_gt_check_fifodbg is reading from GTFIFODBG register and it is not on the
same cacheline

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