[PATCH 4/4] iommu/arm-smmu: Add the device_link between masters and smmu
Sricharan
sricharan at codeaurora.org
Tue Oct 25 21:14:05 PDT 2016
Hi Marek,
>
>On 2016-10-21 19:14, Sricharan R wrote:
>> The device link between master and its smmu is added so that
>> the smmu gets runtime enabled/disabled when the master needs it.
>> This is done from add_device callback which gets called once
>> when the master is added to the smmu group.
>>
>> Signed-off-by: Sricharan R <sricharan at codeaurora.org>
>> ---
>> drivers/iommu/arm-smmu.c | 9 +++++++++
>> 1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
>> index 578cdc2..71ce4b6 100644
>> --- a/drivers/iommu/arm-smmu.c
>> +++ b/drivers/iommu/arm-smmu.c
>> @@ -1470,6 +1470,15 @@ static int arm_smmu_add_device(struct device *dev)
>> goto out_free;
>> pm_runtime_put_sync(smmu->dev);
>>
>> + /*
>> + * Establish the link between smmu and master, so that the
>> + * smmu gets runtime enabled/disabled as per the master's
>> + * needs.
>> + */
>> +
>> + device_link_add(dev, smmu->dev, DEVICE_LINK_AVAILABLE,
>> + DEVICE_LINK_PM_RUNTIME);
>
>Please update to the latest version of Rafael's patches. In V5 the
>initial link
>state is not needed anymore and there was an important fix for creating
>links
>during master's driver probing, what happens after applying your IOMMU
>deferred
>probe patchset.
Sure i will update to V5. I see that i am on V4.
Regards,
Sricharan
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