[Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter

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https://bugzilla.kernel.org/show_bug.cgi?id=201753

--- Comment #4 from Suravee Suthikulpanit (suravee.suthikulpanit@xxxxxxx) ---
Created attachment 295089
  --> https://bugzilla.kernel.org/attachment.cgi?id=295089&action=edit
(RFCv2) Proposed workaround for the IOMMU PMC issue

RFCv2 patch adds the logic to retry after 10msec wait for each retry loop. I
have founded that certain platform takes about 10msec for the power gating to
disable.

Please give this a try to see if this works better on your platform.

Thanks,
Suravee

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