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From: Scott Wood <scottwood@freescale.com>
To: Jia Hongtao-B38951 <B38951@freescale.com>
Cc: Wood Scott-B07421 <B07421@freescale.com>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	Li Yang-R58472 <r58472@freescale.com>
Subject: Re: [PATCH 5/6] powerpc/fsl-pci: Add pci inbound/outbound PM support
Date: Tue, 7 Aug 2012 10:34:47 -0500	[thread overview]
Message-ID: <50213597.5080600@freescale.com> (raw)
In-Reply-To: <412C8208B4A0464FA894C5F0C278CD5D01A48CF7@039-SN1MPN1-002.039d.mgd.msft.net>

On 08/07/2012 05:11 AM, Jia Hongtao-B38951 wrote:
> 
> 
>> -----Original Message-----
>> From: Kumar Gala [mailto:galak@kernel.crashing.org]
>> Sent: Tuesday, July 31, 2012 9:37 PM
>> To: Jia Hongtao-B38951
>> Cc: linuxppc-dev@lists.ozlabs.org; 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:
>>
>>>> -----Original Message-----
>>>> From: Kumar Gala [mailto:galak@kernel.crashing.org]
>>>> Sent: Friday, July 27, 2012 9:24 PM
>>>> To: Jia Hongtao-B38951
>>>> Cc: linuxppc-dev@lists.ozlabs.org; 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:
>>>>
>>>>> Power supply for PCI inbound/outbound window registers is off when
>>>> system
>>>>> go to deep-sleep state. We save the values of registers before
>>>>> suspend and restore to registers after resume.
>>>>>
>>>>> Signed-off-by: Jiang Yutang <b14898@freescale.com>
>>>>> Signed-off-by: Jia Hongtao <B38951@freescale.com>
>>>>> Signed-off-by: Li Yang <leoli@freescale.com>
>>>>> ---
>>>>> arch/powerpc/include/asm/pci-bridge.h |    2 +-
>>>>> arch/powerpc/sysdev/fsl_pci.c         |  121
>>>> +++++++++++++++++++++++++++++++++
>>>>> 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

  reply	other threads:[~2012-08-07 15:34 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-24 10:20 [PATCH 1/6] powerpc/fsl-pci: Unify pci/pcie initialization code Jia Hongtao
2012-07-24 10:20 ` [PATCH 2/6] powerpc/fsl-pci: Check swiotlb enable at board setup_arch stage Jia Hongtao
2012-07-24 10:20 ` [PATCH 3/6] powerpc/fsl-pci: Determine primary bus by looking for ISA node Jia Hongtao
2012-07-24 18:47   ` Scott Wood
2012-07-25  2:42     ` Jia Hongtao-B38951
2012-07-25 17:25       ` Scott Wood
2012-07-26  2:20         ` Jia Hongtao-B38951
2012-07-27  1:34           ` Scott Wood
2012-07-27  2:07             ` Jia Hongtao-B38951
2012-07-27 16:37               ` Scott Wood
2012-07-25  9:01     ` Jia Hongtao-B38951
2012-07-25 17:27       ` Scott Wood
2012-07-24 10:20 ` [PATCH 4/6] powerpc/mpc85xx_ds: convert to unified PCI init Jia Hongtao
2012-07-24 10:20 ` [PATCH 5/6] powerpc/fsl-pci: Add pci inbound/outbound PM support Jia Hongtao
2012-07-27 13:24   ` Kumar Gala
2012-07-30  6:09     ` Jia Hongtao-B38951
2012-07-31 13:37       ` Kumar Gala
2012-08-02 11:35         ` Jia Hongtao-B38951
2012-08-07 10:11         ` Jia Hongtao-B38951
2012-08-07 15:34           ` Scott Wood [this message]
2012-08-07 17:34             ` Kumar Gala
2012-08-08  3:07               ` Jia Hongtao-B38951
2012-08-08  9:54             ` Jia Hongtao-B38951
2012-08-08 12:46               ` Kumar Gala
2012-08-08 21:04                 ` Scott Wood
2012-08-09 10:32                   ` Jia Hongtao-B38951
2012-08-09  2:52                 ` Jia Hongtao-B38951
2012-08-09  5:05                   ` Li Yang
2012-08-09 13:08                     ` Kumar Gala
2012-08-10  2:17                       ` Jia Hongtao-B38951
2012-07-24 10:20 ` [PATCH 6/6] Edac/85xx: Register mpc85xx_pci_err_driver by fsl_pci_driver Jia Hongtao
2012-07-24 18:42 ` [PATCH 1/6] powerpc/fsl-pci: Unify pci/pcie initialization code Scott Wood
2012-07-25  2:35   ` Jia Hongtao-B38951
2012-07-25 17:23     ` Scott Wood
2012-07-26  2:09       ` Jia Hongtao-B38951
2012-07-26  2:38       ` Jia Hongtao-B38951

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