[Bug 80703] [BSW]The infomation read from RC6 status register is wrong

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80703

--- Comment #5 from Guo Jinxian <jinxianx.guo at intel.com> ---
Created attachment 102416
  --> https://bugs.freedesktop.org/attachment.cgi?id=102416&action=edit
dmesg

(In reply to comment #4)
> Created attachment 102378 [details] [review]
> i915/drm/chv: calculate rc6 residency correctly

On latest -next-queued() with the patch, the result shows below:

[root at x-bsw01 tools]# ./intel_reg_read 0x130094
0x130094 : 0xA1


[root at x-bsw01 tests]# ./pm_rc6_residency
IGT-Version: 1.7-g838f321 (x86_64) (Linux: 3.16.0-rc4_kcloud_97a14c_20140708+
x86_64)
Test assertion failure function rc6_residency_check, file
pm_rc6_residency.c:143:
Last errno: 0, Success
Failed assertion: diff <= (SLEEP_DURATION + RC6_FUDGE)
Diff was too high. That is unpossible
Subtest rc6-residency-check: FAIL
This machine doesn't support rc6pp
This machine doesn't support rc6p
The residency counter: 9.600667
Test assertion failure function rc6_residency_counter, file
pm_rc6_residency.c:131:
Last errno: 0, Success
Failed assertion: (flag_counter != 0) && (counter_result <=1)
Sysfs RC6 residency counter is inaccurate.
Subtest rc6-residency-counter: FAIL

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