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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - DebugFS reporting wrong RC-state on ilk"
href="https://bugs.freedesktop.org/show_bug.cgi?id=68150">68150</a>
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<th>CC</th>
<td>ben@bwidawsk.net
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<th>Assignee</th>
<td>jbarnes@sgi.com
</td>
</tr>
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<th>Summary</th>
<td>DebugFS reporting wrong RC-state on ilk
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>joecool1029@gmail.com
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>Status</th>
<td>ASSIGNED
</td>
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<th>Version</th>
<td>XOrg CVS
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Product</th>
<td>DRI
</td>
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<p>
<div>
<pre>Patched in this series of patches from bwidawsk to test RC6 state on ILK.
<a href="http://lists.freedesktop.org/archives/intel-gfx/2013-July/030263.html">http://lists.freedesktop.org/archives/intel-gfx/2013-July/030263.html</a>
Issue was seeing if it ever reached RC6 state, sysfs has no interface for this
anymore. I poked around in debugFS and found i915_drpc_info.
cat /sys/kernel/debug/dri/64/i915_drpc_info
HD boost: yes
Boost freq: 9
HW control enabled: no
SW control enabled: yes
Gated voltage change: no
Starting frequency: P8
Max P-state: P0
Min P-state: P10
RS1 VID: 0
RS2 VID: 8
Render standby enabled: yes
Current RS state: RC1
It also shows RS state: on if performing activity on the GPU. Tried polling
repeatedly using:
while [ 1 ] ; do grep "Current" /sys/kernel/debug/dri/0/i915_drpc_info >>
out.txt ; sleep .01; done
Still bounced between RC1 and on, never hitting RC6
However, if I use intel-gpu-tools and run:
intel_reg_read 0x111b8
I see:
0x111B8 : 0x474C3000 (RS2/RC6)
or
0x111B8 : 0x471C3000 (RS1)
or
0x111B8 : 0x470C3000 (on)
Though today I'm seeing just:
0x111B8 : 0x0
0x111B8 : 0x100000</pre>
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