[Bug 59368] [snb rc6] rc6 is not happening reliably

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59368

Andy Lutomirski <luto at mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #7 from Andy Lutomirski <luto at mit.edu> ---
[luto at antithesis tools]$ sudo cat /sys/kernel/debug/dri/0/i915_drpc_info
RC information accurate: yes
Video Turbo Mode: yes
HW control enabled: yes
SW control enabled: no
RC1e Enabled: no
RC6 Enabled: yes
Deep RC6 Enabled: no
Deepest RC6 Enabled: no
Current RC state: on
Core Power Down: no
RC6 "Locked to RPn" residency since boot: 0
RC6 residency since boot: 115522
RC6+ residency since boot: 0
RC6++ residency since boot: 0
RC6   voltage: 450mV
RC6+  voltage: 245mV
RC6++ voltage: 245mV
[luto at antithesis tools]$ sudo intel_reg_read 0xa094
Couldn't map MMIO region: No such file or directory
[luto at antithesis tools]$ ^Cdo intel_reg_read 0xa094
(reverse-i-search)`': ^C
[luto at antithesis tools]$ sudo intel_reg_write 0xa094 0xf0000
Couldn't map MMIO region: No such file or directory
[luto at antithesis tools]$ sudo intel_reg_write 0xa094 0xf000^C
$ sudo ./intel_reg_read 0xa094
0xA094 : 0x0
$ sudo ./intel_reg_write 0xa094 0xf0000
Value before: 0x0
Value after: 0x70000
$ sudo ./intel_reg_read 0xa094
0xA094 : 0x70000
$ sudo cat /sys/kernel/debug/dri/0/i915_drpc_info
RC information accurate: yes
Video Turbo Mode: yes
HW control enabled: yes
SW control enabled: no
RC1e Enabled: no
RC6 Enabled: yes
Deep RC6 Enabled: no
Deepest RC6 Enabled: no
Current RC state: on
Core Power Down: no
RC6 "Locked to RPn" residency since boot: 0
RC6 residency since boot: 115522
RC6+ residency since boot: 0
RC6++ residency since boot: 0
RC6   voltage: 450mV
RC6+  voltage: 245mV
RC6++ voltage: 245mV

Are you sure that's the right register?

(Can you point me to the right section of the programming manual?  I tried
awhile ago but I couldn't find it.)

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