<div dir="ltr"><div><div><div>Hi Chris,<br><br></div><div>You can query the nominal and maximum frequency of your GPU via debugfs, in case that is good enough for your needs. Depending on what kernel version you have you can try to cat /sys/kernel/debug/dri/0/i915_cur_delayinfo or with more recent versions, /sys/kernel/debug/dri/0/i915_frequency_info<br>
<br></div><div>If you are curious about more details then it may be best to look at the drm driver code in drivers/gpu/drm/i915/i915_debugfs.c:i915_frequency_info().<br></div><br>--<br></div>Regards,<br></div>Robert<br><div>
<div><div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 18, 2014 at 1:55 AM, He, Shuang <span dir="ltr"><<a href="mailto:shuang.he@intel.com" target="_blank">shuang.he@intel.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">Hi, Chris<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"> Let’s put you to the correct Mailing list for this topic first<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">Thanks<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"> --Shuang<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:11pt;font-family:"Calibri","sans-serif"" lang="EN-US">From:</span></b><span style="font-size:11pt;font-family:"Calibri","sans-serif"" lang="EN-US"> Chris Healy [mailto:<a href="mailto:cphealy@gmail.com" target="_blank">cphealy@gmail.com</a>]
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<b>Sent:</b> Wednesday, June 18, 2014 1:15 AM<br>
<b>To:</b> Eric Anholt; He, Shuang<br>
<b>Subject:</b> intel_gpu_top missing clocks<u></u><u></u></span></p>
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<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12pt"><span lang="EN-US">Eric, Shuang,<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12pt"><span lang="EN-US">I couldn't find an appropriate mailing list to report this on, so I'm mailing the two of you as you've both touched the clock code in intel_gpu_top.<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12pt"><span lang="EN-US">I'm running an Ivy Bridge Mobile chipset and trying to use intel_gpu_top and intel_stepping to see the GPU clock frequencies. In both cases, the clocks are "unknown".<br>
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When I look at the code, it seems that there's just no code path to handle this devid, though I'm not sure as I'm not very good at understanding code. I see in intel_chipset.h that device id 0x0166 = PCI_CHIP_IVYBRIDGE_M_GT2 and that none of the "if's" in
print_clock_info ultimately point to this device type.<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12pt"><span lang="EN-US">Do either of you know why this would be? Is it just a case of coding for the majority of chipset configurations?<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12pt"><span lang="EN-US">If it's just the case of it not yet being handled, I'd be open to trying to add support for it if you could point me to the necessary chip documentation.<u></u><u></u></span></p>
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<p class="MsoNormal"><span lang="EN-US">Regards,<br>
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Chris<u></u><u></u></span></p>
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