From mboxrd@z Thu Jan 1 00:00:00 1970 From: huang ying Subject: Re: [RFC PATCH] PCIe: Add PCIe runtime D3cold support Date: Wed, 18 Apr 2012 09:22:20 +0800 Message-ID: References: <4F8790F6.5080408@intel.com> <4F8CD18A.5080903@intel.com> <201204172243.39525.rjw@sisk.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <201204172243.39525.rjw@sisk.pl> Sender: linux-pci-owner@vger.kernel.org To: "Rafael J. Wysocki" Cc: "Yan, Zheng" , bhelgaas@google.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Lin Ming , Zhang Rui , ACPI Devel Mailing List List-Id: linux-acpi@vger.kernel.org On Wed, Apr 18, 2012 at 4:43 AM, Rafael J. Wysocki wrote: > On Tuesday, April 17, 2012, huang ying wrote: >> On Tue, Apr 17, 2012 at 10:12 AM, Yan, Zheng = wrote: >> > On 04/17/2012 01:07 AM, Rafael J. Wysocki wrote: >> > >> >> BTW, can you please explain to me what the #WAKE signal is and ho= w it is >> >> different from PME#? >> > >> > #WAKE signal is triggered by a pin connected to the root complex o= r other >> > motherboard logic. PME# is triggered by PME message sent to the po= rt. >> >> PME# is a PCI pin, while WAKE# is a PCI Express pin. =C2=A0In PCI Ex= press, >> there is no PME#, PME is delivered between end point device and root >> port or root complex event collector via PME message, and the PME >> message will trigger IRQ on root port or root complex event collecto= r. >> =C2=A0WAKE# is not used for PCI Express D1, D2 and D3hot, it is just= used >> by D3cold. =C2=A0When remote wakeup detected by end point device, it= will >> assert WAKE# to notify power controller (implemented via ACPI on som= e >> platform), then power controller will turn on power for main link, >> after link goes back to L0, PME message will be sent to root port or >> root complex event collector by end point device. > > OK > > So do I understand correctly that the WAKE# signal here is the one de= scribed > in Section 5.3.3.2 Link Wakeup of PCI Express Base spec. 2.0? > > So what happens is that it triggers a GPE and that GPE has a _Lxx met= hod > associated with it, I suppose. =C2=A0Is that correct? Yes. Best Regards, Huang Ying