[Bug 76539] New: [BYT] RC6 cannot enable using 2014Q1 Release kernel 3.13.6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76539

          Priority: medium
            Bug ID: 76539
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT] RC6 cannot enable using 2014Q1 Release kernel
                    3.13.6
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: wendy.wang at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 96267
  --> https://bugs.freedesktop.org/attachment.cgi?id=96267&action=edit
RC6 issue dmesg file

Boot with 2014Q1 Release kernel version: Linux 3.13.6_20140318+ #1 SMP Tue Mar
18 09:15:05 CST 2014 x86_64 x86_64 x86_64 GNU/Linux
By default setting, cat rc6 debugfs file as below, will see the RC6 us
disabled.

# cd /sys/kernel/debug/dri/0/
# cat i915_drpc_info
RC information accurate: no
Video Turbo Mode: yes
HW control enabled: yes
SW control enabled: no
RC1e Enabled: no
RC6 Enabled: no
Deep RC6 Enabled: no
Deepest RC6 Enabled: no
Current RC state: on
Core Power Down: no
RC6 "Locked to RPn" residency since boot: 32771
RC6 residency since boot: 1419692410
RC6+ residency since boot: 3755604010
RC6++ residency since boot: 0
RC6   voltage: 245mV
RC6+  voltage: 245mV
RC6++ voltage: 245mV

Even insert RC6 enable parameter, and reboot, RC6 still show disabled in
debugfs file.

Change the kernel to 2014_03_14 nightly kernel branch, RC6 is enabled by
default kernel setting.

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