Messages in this thread | | | Date | Sun, 8 Jul 2018 10:31:30 +0300 | From | Mika Westerberg <> | Subject | Re: [PATCH 5/5] thunderbolt: Add support for runtime PM |
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On Sat, Jul 07, 2018 at 11:14:01PM +0200, Lukas Wunner wrote: > On Mon, Jun 18, 2018 at 02:07:31PM +0300, Mika Westerberg wrote: > > Implement this using standard Linux runtime PM APIs so that when all the > > children devices are runtime suspended, the Thunderbolt host controller > > PCI device is runtime suspended as well. The ICM firmware then starts > > powering down power domains towards RTD3 but it can prevent this if it > > detects that there is an active Display Port stream (this is not visible > > to the software, though). > > > > The Thunderbolt host controller will be runtime resumed either when > > there is a remote wake event (device is connected or disconnected), or > > when there is access from userspace that requires hardware access. > > IIUC, if there is no xdomain, after 15 s all switch devices as well as > the domain device and the NHI will have runtime suspended. The control > channel is torn down as well, so you can no longer receive notifications > over it. Then how is wakeup of the NHI signalled on hotplug/unplug? > Do you get a PME for the NHI device?
Yes, it sends PME.
> Because I'm fairly certain that > I do not get a PME for the Light Ridge in my MacBook Pro, but I'll test > this once more and modify negotiate_os_control() to grant PME control > to the OS.
I think in case of Apple hardware, they handle the in some different means than PME (possibly part of chipset driver or ACPI method/event).
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