On Tue, Aug 23, 2022 at 10:55:01PM +0800, Kai-Heng Feng wrote: > On Tue, Aug 9, 2022 at 12:17 AM Vidya Sagar <vidyas@xxxxxxxxxx> wrote: > > > > Thanks Lukasz for the update. > > I think confirms that there is no issue with the patch as such. > > Bjorn, could you please define the next step for this patch? > > I think the L1SS cap went away _after_ L1SS registers are restored, > since your patch already check the cap before doing any write: > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > + if (!aspm_l1ss) > + return; > > That means it's more likely to be caused by the following change: > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > So is it possible to clear PCI_L1SS_CTL1 before setting PCI_L1SS_CTL2, > like what aspm_calc_l1ss_info() does? Sorry, I've totally lost track of where we are with this. I guess the object is to save/restore L1SS state. And there are two problems that aren't understood yet? 1) Lukasz's 01:00.0 wifi device didn't work immediately after resume, but seemed to be hot-added later? [1] 2) The 00:14.0 Root Port L1SS capability was present before suspend/resume but not after? [2,3] I thought Lukasz's latest emails [4,5] indicated that problem 1) still happened and presumably only happens with Vidya's patch, and 2) also still happens, but happens even *without* Vidya's patch. Do I have that right? If adding the patch causes 1), obviously we would need to fix that. It would certainly be good to understand 2) as well, but I guess if that's a pre-existing problem, ... Bjorn [1] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-dmesg-L1762 [2] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-lspci-before-suspend-log-L136 [3] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-lspci-after-suspend-log-L136 [4] https://lore.kernel.org/r/CAFJ_xbr5NjoV1jC3P93N4UgooUuNdCRnrX7HuK=xLtPM5y7EjA@xxxxxxxxxxxxxx [5] https://lore.kernel.org/r/CAFJ_xboyQyEaDeQ+pZH_YqN52-ALGNqzmmzeyNt6X_Cz-c1w9Q@xxxxxxxxxxxxxx
