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On Jul 24, 2012, at 5:20 AM, Jia Hongtao wrote:
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Power supply for PCI inbound/outbound window registers is off =
when
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system
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go to deep-sleep state. We save the values of registers before
suspend and restore to registers after resume.
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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
+++++++++++++++++++++++++++++++++
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2 files changed, 122 insertions(+), 1 deletions(-)
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Remind me why we need to save/restore PCI ATMUs, why not just
re-parse the device tree to restore?
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- k
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Save/restore is the more efficient way. Latency of sleep/wakeup is
one of most important features in power management.
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-Hongtao.
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I don't think the time it takes to run through setup_pci_atmu() is
that long compared to fsl_pci_resume().
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Also, don't you need to setup PCICCSRBAR and do setup_pci_cmd() on
resume?
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- k
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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.
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How does the PCI code know you're entering deep sleep and not =
hibernation?
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-Scott
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When system come back from hibernation PCI will be initialized again.
So no need to save PCI_CMD and PEXCSRBAR.
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-Hongtao.=20
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What do you mean PCI will be initialized again? What code path are you =
talking about that would set PCI_CMD & PEXCSRBAR?
- k=