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<p class="msipheaderc10f11a2" style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:green">[Public]</span><o:p></o:p></p>
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<p class="MsoNormal">Hi Lijo,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For cyan skillfish, both adev->cg_flags and adev->pg_flags are zero. I just found “RREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG);” in mmhub_v2_0_get_clockgating() caused a gpu hang(cat amdgpu_pm_info). I didn’t check if it's some sort of
PG which causes the issue.<o:p></o:p></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Lang<o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Lazar, Lijo <Lijo.Lazar@amd.com> <br>
<b>Sent:</b> Wednesday, January 26, 2022 8:06 PM<br>
<b>To:</b> Yu, Lang <Lang.Yu@amd.com>; amd-gfx@lists.freedesktop.org<br>
<b>Cc:</b> Deucher, Alexander <Alexander.Deucher@amd.com>; Huang, Ray <Ray.Huang@amd.com>; Yu, Lang <Lang.Yu@amd.com><br>
<b>Subject:</b> Re: [PATCH] drm/amdgpu: add safeguards for accessing mmhub CG registers<o:p></o:p></p>
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<p style="margin:15.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:green">[Public]<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="color:#212121">Hi L</span><span style="font-size:12.0pt;color:#212121">ang,</span><span style="color:#212121"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:#212121">There are ASICs in which driver doesn't enable CG, and then these flags will be false. However, the CG will be enabled by another component like VBIOS. Driver still reports
the CG status eventhough driver doesn't enable it. For those, this logic doesn't work. </span><span style="color:#212121"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="color:#212121"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:#212121">BTW, could you check if it's some sort of PG which causes the issue?</span><span style="color:#212121"><o:p></o:p></span></p>
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<p class="MsoNormal">Thanks,<br>
Lijo<o:p></o:p></p>
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