Messages in this thread | | | Date | Thu, 1 Sep 2022 10:40:18 -0400 | From | Alan Stern <> | Subject | Re: [PATCH v3] usb: ohci-platform: fix usb disconnect issue after s4 |
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On Thu, Sep 01, 2022 at 09:54:46AM +0800, Yinbo Zhu wrote: > Avoid retaining bogus hardware states during resume-from-hibernation. > Previously we had reset the hardware as part of preparing to reinstate > the snapshot image. But we can do better now with the new PM framework, > since we know exactly which resume operations are from hibernation. > > According to the commit 'cd1965db054e ("USB: ohci: move ohci_pci_{ > suspend,resume} to ohci-hcd.c")' and commit '6ec4beb5c701 ("USB: new > flag for resume-from-hibernation")', the flag "hibernated" is for > resume-from-hibernation and it should be true when usb resume from disk. > > When this flag "hibernated" is set, the drivers will reset the hardware > to get rid of any existing state and make sure resume from hibernation > re-enumerates everything for ohci.
The patch title mentions "usb disconnect issue", but the description says nothing about it. Please explain what this disconnect issue is.
Alan Stern
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