linux-kernel - Re: Linux Support for Thunderbolt using Apple Monitor

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Date:	Sat, 5 May 2012 18:48:19 +0200
From:	Nico Schottelius <nico-linux-20120419@...ottelius.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Francois Rigaut <frigaut@...il.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org,
	Nico Schottelius <nico-linux-20120419@...ottelius.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Linux Support for Thunderbolt using Apple Monitor

Hey Jiang,

Jiang Liu [Sat, May 05, 2012 at 11:18:09PM +0800]:
> 	It seems that the PCI topology related to the Thunderbird is:

Thanks for digging into this, I've the feeling we could somehow get
this running in the end...

> [...] 
> According to the acpidump sent out by you, I guess the relationship among PCIe and ACPI is as below:
>         Device (PCI0)	// PCIe host bridge
>         {
>             Name (_HID, EisaId ("PNP0A08"))
>             Device (P0P2)	//00:01.0
>             {
>                 Name (_ADR, 0x00010000)
>                 Device (UPSB)	//03:00.0
>                 {
>                     Name (_ADR, 0x00)
>                     Device (DSB2)	//04:04.0
>                     {
>                         Name (_ADR, 0x00040000)
>                         Method (_RMV, 0, NotSerialized)
>                         {
>                             Return (OSDW ()) // OSDW-> OS is Darwin
>                         }
>                         Device (UPS2)	//37:00.0
>                         {
>                             Name (_ADR, 0x00)
> 			}
> 		    }
> 		}
> 	    }
> 	}
> 
> But _RMV method only returns 1 on iOS or Max OS X. That means ACPI based hotplug is disabled
> on Linux for your system. And as Yinghai has pointed out, all the PCIe downstream ports on 
> the system don't support PCIe hotplug. So need BIOS or hardware changes to support Thunderbolt
> cable hotplug on your system.

I'm not deep into how acpi works, but wondering: Can't we replace that part,
change the tree or emulate a different OSDW() method similar to LD_PRELOAD?

Cheers,

Nico

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