On 11/26/19 8:19 PM, Stuart Hayes wrote: > On Tue, Nov 26, 2019 at 7:36 PM Bjorn Helgaas <helgaas@xxxxxxxxxx> wrote: >> >> On Fri, Oct 25, 2019 at 03:00:45PM -0400, Stuart Hayes wrote: >>> From: Alexandru Gagniuc <mr.nuke.me@xxxxxxxxx> >>> >>> The presence detect state (PDS) is normally a logical or of in-band and >>> out-of-band presence. As of PCIe 4.0, there is the option to disable >>> in-band presence so that the PDS bit always reflects the state of the >>> out-of-band presence. >>> >>> The recommendation of the PCIe spec is to disable in-band presence >>> whenever supported. >> >> I think I'm fine with this patch, but I would like to include the >> specific reference for this recommendation. If you have it handy, I >> can just insert it. >> > > The PCI Express Base Specification Revision 5.0, Version 1.0, in the > implementation note under Appendix I ("Async Hot-Plug Reference > Model"), it says "If OOB PD is being used and the associated DSP > supports In-Band PD Disable, it is recommended that the In-Band PD > Disable bit be Set, ..." > > Is that what you were looking for? Please let me know if there's anything else I can do to help.