On 08/07/2012 05:11 AM, Jia Hongtao-B38951 wrote:
quoted
-----Original Message-----
From: Kumar Gala [mailto:<redacted>]
Sent: Tuesday, July 31, 2012 9:37 PM
To: Jia Hongtao-B38951
Cc: <redacted>; Wood Scott-B07421; Li Yang-R58472
Subject: Re: [PATCH 5/6] powerpc/fsl-pci: Add pci inbound/outbound PM
support
On Jul 30, 2012, at 1:09 AM, Jia Hongtao-B38951 wrote:
quoted
quoted
-----Original Message-----
From: Kumar Gala [mailto:<redacted>]
Sent: Friday, July 27, 2012 9:24 PM
To: Jia Hongtao-B38951
Cc: <redacted>; Wood Scott-B07421; Li Yang-R58472
Subject: Re: [PATCH 5/6] powerpc/fsl-pci: Add pci inbound/outbound PM
support
On Jul 24, 2012, at 5:20 AM, Jia Hongtao wrote:
quoted
Power supply for PCI inbound/outbound window registers is off when
system
quoted
go to deep-sleep state. We save the values of registers before
suspend and restore to registers after resume.
Signed-off-by: Jiang Yutang <redacted>
Signed-off-by: Jia Hongtao <redacted>
Signed-off-by: Li Yang <redacted>
---
arch/powerpc/include/asm/pci-bridge.h | 2 +-
arch/powerpc/sysdev/fsl_pci.c | 121
+++++++++++++++++++++++++++++++++
quoted
2 files changed, 122 insertions(+), 1 deletions(-)
Remind me why we need to save/restore PCI ATMUs, why not just
re-parse the device tree to restore?
- k
Save/restore is the more efficient way. Latency of sleep/wakeup is one
of most important features in power management.
-Hongtao.
I don't think the time it takes to run through setup_pci_atmu() is that
long compared to fsl_pci_resume().
Also, don't you need to setup PCICCSRBAR and do setup_pci_cmd() on resume?
- k
Hi Kumar,
I did some tests on P1022DS and found out that PCI_CMD and PCICSRBAR is not
lost when system in deep sleep. We don't need to save it.
How does the PCI code know you're entering deep sleep and not hibernation?
-Scott