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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Yaroslav Shabalin,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">This restriction is only for PSR2. Will provide the fix.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Vathsala</span><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></a></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Intel-gfx [mailto:intel-gfx-bounces@lists.freedesktop.org]
<b>On Behalf Of </b>Yaroslav Shabalin<br>
<b>Sent:</b> Tuesday, May 23, 2017 4:59 AM<br>
<b>To:</b> intel-gfx@lists.freedesktop.org<br>
<b>Subject:</b> Re: [Intel-gfx] [PATCH] drm/i915/psr: disable psr2 for resolution greater than 32X20<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi!<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm not sure if this is suitable way to report bugs but seems that this change breaks PSR support on my laptop. <o:p></o:p></p>
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<p class="MsoNormal">I have Dell XPS 15 9550 with Skylake i7-6700HQ CPU, 4K screen resolution (3840x2160) and Arch Linux installed. Having i915.enable_psr=1 boot parameter on kernels <= 4.10 I get the following:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-> cat /sys/kernel/debug/dri/0/i915_edp_psr_status<o:p></o:p></p>
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<p class="MsoNormal">Sink_Support: yes<o:p></o:p></p>
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<p class="MsoNormal">Source_OK: yes<o:p></o:p></p>
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<p class="MsoNormal">Enabled: yes<o:p></o:p></p>
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<p class="MsoNormal">Active: yes<o:p></o:p></p>
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<p class="MsoNormal">Busy frontbuffer bits: 0x000<o:p></o:p></p>
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<p class="MsoNormal">Re-enable work scheduled: no<o:p></o:p></p>
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<p class="MsoNormal">Main link in standby mode: no<o:p></o:p></p>
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<p class="MsoNormal">HW Enabled & Active bit: yes<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">However on kernel 4.11 (which I believe has this commit merged) PSR is not enabled with native screen resolution.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-> cat /sys/kernel/debug/dri/0/i915_edp_psr_status <o:p></o:p></p>
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<p class="MsoNormal">Sink_Support: yes<o:p></o:p></p>
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<p class="MsoNormal">Source_OK: no<o:p></o:p></p>
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<p class="MsoNormal">Enabled: no<o:p></o:p></p>
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<p class="MsoNormal">Active: no<o:p></o:p></p>
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<p class="MsoNormal">Busy frontbuffer bits: 0x000<o:p></o:p></p>
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<p class="MsoNormal">Re-enable work scheduled: no<o:p></o:p></p>
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<p class="MsoNormal">Main link in standby mode: no<o:p></o:p></p>
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<p class="MsoNormal">HW Enabled & Active bit: no<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If I change resolution to lower value (i.e. 3200x1800) PSR gets enabled as on <= 4.10 kernel. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">That is very sad because without PSR CPU never goes deeper than PC7 increasing idle power consumption by ~1W. I would really appreciate if someone investigate this issue. Is this resolution restriction really needed and should block PSR
fully? Seems that on older kernels it wasn't a problem. Please let me know if you need any additional diagnostic information.<o:p></o:p></p>
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