linux-kernel - Re: Thunderbolt hotplug not working on MacMini7,1

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Message-ID: <CAMxnaaXK+vgTOjCaKzMjSAERmmNjGguBu9+Xu8=KYhGHiWLmrw@mail.gmail.com>
Date:	Wed, 6 May 2015 12:18:14 +0200
From:	Andreas Noever <andreas.noever@...il.com>
To:	Adam Goode <adam@...cenitz.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: Thunderbolt hotplug not working on MacMini7,1

On Mon, May 4, 2015 at 3:00 PM, Adam Goode <adam@...cenitz.org> wrote:
> On Sat, Apr 25, 2015 at 11:00 PM, Adam Goode <adam@...cenitz.org> wrote:
>> Here's the problem:
>>
>> [    0.126595] ACPI Error: No handler for Region [CMS0]
>> (ffff8802658a0438) [SystemCMOS] (20150410/evregion-163)
>> [    0.126597] ACPI Error: Region SystemCMOS (ID=5) has no handler
>> (20150410/exfldio-297)
>> [    0.126600] ACPI Error: Method parse/execution failed
>> [\_SB_.PCI0._INI] (Node ffff8802658ac500), AE_NOT_EXIST
>> (20150410/psparse-536)
>> [    0.126605] ACPI Exception: AE_NOT_EXIST, during
>> \_SB_.PCI0._INI._INI execution (20150410/nsinit-588)
>>
>> ...
>>
>> [    0.170603]       bus-0130 bus_get_status        : Device [RTC]
>> status [0000000f]
>> [    0.170605] evhandler-0446 ev_install_space_handl: Creating object
>> on Device ffff8802658a82a8 while installing handler
>> [    0.170607] evhandler-0482 ev_install_space_handl: Installing
>> address handler for region SystemCMOS(5) on Device RTC_
>> ffff8802658a82a8(ffff880264160090)
>> [    0.170610]  evregion-0506 ev_attach_region      : Adding Region
>> [CMS0] ffff8802658a0438 to address handler ffff880264160480
>> [SystemCMOS]
>>
>>
>> Next step is to figure out how to install the address handler earlier.
>>
>>
>
> Current status:
>
> I have a patch out to fix the CMOS handler issue:
> http://marc.info/?l=linux-acpi&m=143052869625376&w=2
>
> The CMOS handler is called in the Darwin codepath as well, so it's a
> useful fix regardless.
>
> When I patched with this support, and booted in non-Darwin mode,
> hotplug worked without further Linux driver support (I disabled the
> thunderbolt module). Suspend/resume still does not work unless I don't
> activate any thunderbolt device at all. This happens regardless of
> which OSI mode.
>
> So there is a suspend/resume problem which seems more generic. I am
> not sure if I have time to debug this.
>
> One thing that would be useful would be to change the Darwin special
> case code to make it configurable on the kernel command line.
>
> Lastly, when ACPI fully initializes the thunderbolt controller, the
> Linux thunderbolt module hangs for several seconds upon loading, and
> then fails. Which is probably correct, but I don't know if it messes
> up any state in the mean time (plus it shouldn't hang). Is there a way
> to have the module detect BIOS support and disable itself? Or to
> properly do a handover?
I have no idea how to do a proper handoff. I guess the easiest way is
to refuse loading the thunderbolt module if the new "no_darwin" acpi
flag is set.
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