Linux Hibernation with sata driver

[Varka Bhadram]

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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