[PATCH] powerpc/85xx: Save and restore pcie ATMU windows for PM

[Kushwaha Prabhakar-B32579]

> -----Original Message-----
> From: Kumar Gala [mailto:galak at kernel.crashing.org]
> Sent: Thursday, May 19, 2011 6:53 PM
> To: Kushwaha Prabhakar-B32579
> Cc: linuxppc-dev at lists.ozlabs.org; meet2prabhu at gmail.com; Jiang Yutang-
> B14898
> Subject: Re: [PATCH] powerpc/85xx: Save and restore pcie ATMU windows for
> PM
> 
> 
> On May 19, 2011, at 6:22 AM, Kushwaha Prabhakar-B32579 wrote:
> 
> > Hi Kumar,
> >  Please find my answer in-lined
> >
> >> -----Original Message-----
> >> From: Kumar Gala [mailto:galak at kernel.crashing.org]
> >> Sent: Thursday, May 19, 2011 12:00 PM
> >> To: Kushwaha Prabhakar-B32579
> >> Cc: linuxppc-dev at lists.ozlabs.org; meet2prabhu at gmail.com; Jiang
> >> Yutang-
> >> B14898
> >> Subject: Re: [PATCH] powerpc/85xx: Save and restore pcie ATMU windows
> >> for PM
> >>
> >>
> >> On Apr 28, 2011, at 1:38 AM, Prabhakar Kushwaha wrote:
> >>
> >>> D3-cold state indicates removal of the clock and power. however
> >>> auxiliary (AUX) Power may remain available even after the main power
> >> rails are powered down.
> >>>
> >>> wakeup from D3-cold state requires full context restore. Other
> >>> things are taken care in pci-driver except ATMUs.
> >>> ATMU windows needs to be saved and restored during suspend and
> resume.
> >>>
> >>> Signed-off-by: Jiang Yutang <b14898 at freescale.com>
> >>> Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
> >>> ---
> >>> Based upon
> >>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> >>> (b
> >>> ranch master)
> >>>
> >>> arch/powerpc/sysdev/fsl_pci.c |  116
> >> +++++++++++++++++++++++++++++++++++++++++
> >>> arch/powerpc/sysdev/fsl_pci.h |    7 ++-
> >>> 2 files changed, 121 insertions(+), 2 deletions(-)
> >>
> >> Is this patch for when we are a host or agent?
> >
> > This patch is independent of host or agent. It is for supporting D3
> cold state for P1022.
> > These functions are called during System level suspend and resume.
> >
> > --Prabhakar
> 
> I'm trying to figure out why this is limited to P1022.

Till now, No SOC was supporting D3 cold state. First time P1022 supporting it.
Note:  D3 cold state == PCIe block Power down

--Prabhakar