Re: [PATCH V6] PCI: rcar: Add L1 link state fix into data abort hook

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On Mon, Jul 19, 2021 at 07:23:40PM +0200, Pali Rohár wrote:
> > On Sat, Jul 17, 2021 at 12:33:34PM -0500, Bjorn Helgaas wrote:

> > >   - "The R-Car PCIe controller is capable of handling L0s/L1 link
> > >     states."  AFAICT every PCIe device is required to handle L0 and L1
> > >     without software assistance.  So saying R-Car is "capable" puts a
> > >     better face on this than seems warranted.
> > > 
> > >     L0s doesn't seem relevant at all; at least it doesn't seem to play
> > >     a role in the patch.  There's no such thing as "returning to L0s"
> > >     as mentioned in the comment below; L0s is only reachable from L0.
> > >     Returns from L1 only go to L0 (PCIe r5.0, fig 5-1).
> 
> IIRC from L1 you can only go to Recovery. And from L0s you go to L0 or
> Recovery. But I do not know what is or was changed in PCIe r5.0.

Yes.  Per PCIe r5.0, fig 4-26, the LTSSM state diagram, that's still
the same.  The overview in Fig 5-1 doesn't include Recovery, Detect,
and othef LTSSM states.



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