On Monday, September 12, 2016 05:07:10 PM Bjorn Helgaas wrote: > On Wed, Aug 31, 2016 at 08:15:18AM +0200, Lukas Wunner wrote: > > The following patches are part of my Thunderbolt Runtime PM series. > > I'm posting them separately to split the series into digestible chunks. > > > > They benefit everyone, not just Thunderbolt, and Thunderbolt works fine > > without them (just not with the same degree of perfection). > > > > Patch [1/4] affords direct-complete to devices which are not platform- > > power-manageable, yet can be suspended to D3cold with a nonstandard > > mechanism. It does so using a heuristic: If a device's current_state > > is D3cold and it is not power-manageable, it is assumed that a > > nonstandard PM mechanism is at work and the device is left asleep. > > The patch is the outcome of a discussion with Rafael and Alan on > > linux-pci@ and I would like to thank both for tirelessly responding > > to my questions. > > > > Patch [3/4] replaces the unconditional resume after direct-complete with > > a conditional resume by determining if the platform firmware has put the > > device in reset-power-on or not. > > > > Because the D3cold state cannot be determined from the PMCSR, patch [2/4] > > adds a hook to query the platform firmware for its opinion on the device's > > power state. > > > > Finally, patch [4/4] changes the shutdown handling of PCI devices such > > that they are no longer woken without reason. > > > > The result of these patches should be a speedup and decreased power > > consumption for system sleep and system shutdown (both for devices that > > are platform-power-manageable and those that aren't). > > > > If you prefer point & click interfaces, the patches are browsable here: > > https://github.com/l1k/linux/commits/thunderbolt_runpm_v3 > > Rafael, do you have any comment on these? I don't have any objections > myself, but I'd like your opinion as the PM expert :) Please give me some more time (a day or two should be sufficient). Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
