Linux Hibernation with sata driver

Varka Bhadram varkab at cdac.in
Mon Jun 2 08:59:23 EDT 2014


Hi Ayan Kumar Halder,

Ya you are right. But ARM only supports AMBA bus, your board may have some
controller
which acts as bridge b/w PCI and AMBA.

Regards,
Varka Bhadram

On June 2, 2014 at 2:29 PM AYAN KUMAR HALDER <ayankumarh at gmail.com> wrote:
> Hi Varka,
>
> This is a arm based custom platform in which we have both AMBA bus as
> well as pci bus (pci slots which can fit addon cards).
> There is no restriction(as far as I understand) that ARM based
> platforms cannot have PCI bus.
>
> Regards,
> Ayan Kumar Halder
>
>
> On Mon, Jun 2, 2014 at 1:28 PM, Varka Bhadram <varkab at cdac.in> wrote:
> > My first doubt is why ARM is having PCI bus... ? I think it has AMBA Bus ...
> >
> >
> > On June 1, 2014 at 11:40 PM AYAN KUMAR HALDER <ayankumarh at gmail.com> wrote:
> >> Hi,
> >>
> >> I am working with Linux hibernation framework on ARM based custom SOC
> >> which has SATA controller on PCI bus.
> >>
> >> I see that when the system resumes from hibernation, the SATA
> >> controller(drivers/ata/ahci.c) on PCI bus fails to come up. My
> >> understanding is that the hibernation calls 'freeze' of all devices.
> >> The SATA controller receives the power state event as PM_EVENT_FREEZE
> >> ( ie pdev->dev.power.power_state.event = PM_EVENT_FREEZE). Thus when
> >> system restores the hibernation image, ahci_pci_device_resume gets
> >> called in which ahci_pci_reset_controller/ahci_pci_init_controller
> >> does not get called. So SATA controller fails to come up.
> >>
> >> Please let me know if my understanding is correct or not. If so, then
> >> in ahci_pci_device_resume() should we change the following
> >> if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND)
> >> to
> >> if (pdev->dev.power.power_state.event == PM_EVENT_FREEZE)
> >>
> >> In hibernation , as we power down the system, so I understand that the
> >> sata controller need to be reset and re-initialized for proper
> >> functioning.
> >>
> >> Regards,
> >> Ayan Kumar Halder
> >>
> > Regards,
> > Varka Bhadram
> >
> >
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