Messages in this thread | | | Date | Thu, 15 May 2003 17:13:40 -0400 (EDT) | From | Alan Stern <> | Subject | Re: Test Patch: 2.5.69 Interrupt Latency |
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On 15 May 2003, Paul Fulghum wrote:
> The erratum is only for the PIIX4, and it is > triggered only when the OC inputs are active, > so limiting the check to that device should > be OK. > > Probably the least intrusive thing to do > is to disable suspending the uhci controller > if it is a PIIX4 *and* either port has an > over current condition. This will catch the case > of a functional USB controller that has one > or more real over current conditions and the > case of a deliberately disabled (by hardwiring > the OC inputs) controller. The erratum will > pop up in both cases causing suspend<->wake > thrashing.
My intention was to avoid resuming if the resume-detect bit is set only on ports in an over-current condition, since that is the case mentioned in the erratum. Of course, this isn't as failsafe as your suggestion. Which do you think would work better?
Alan Stern
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