Re: [PATCH v6 7/7] iommu/exynos: Use device dependency links to control runtime pm

[Rafael J. Wysocki]

On Thu, Nov 10, 2016 at 12:31 AM, Luis R. Rodriguez <mcgrof@xxxxxxxxxx> wrote:
> On Tue, Nov 08, 2016 at 02:29:24PM +0100, Marek Szyprowski wrote:
>> This patch uses recently introduced device dependency links to track the
>> runtime pm state of the master's device. The goal is to let SYSMMU
>> controller device's runtime PM to follow the runtime PM state of the
>> respective master's device. This way each SYSMMU controller is active
>> only when its master's device is active and can properly restore or save
>> its state instead on runtime PM transition of master's device.
>> This approach replaces old behavior, when SYSMMU controller was set to
>> runtime active once after attaching to the master device. In the new
>> approach SYSMMU controllers no longer prevents respective power domains
>> to be turned off when master's device is not being used.
>>
>> The dependency links also enforces proper order of suspending/restoring
>> devices during system sleep transition, so there is no more need to use
>> LATE_SYSTEM_SLEEP_PM_OPS-based workaround for ensuring that SYSMMUs are
>> suspended after their master devices.
>
> Patches 1-6 seems reasonable to me, however in so far as this patch is
> concerned I'd appreaciate if you and Rafael can reply to Lukas Wunner's
> questions.

Which questions exactly do you mean?

Thanks,
Rafael