[PATCH 4/4] iommu/arm-smmu: Add the device_link between masters and smmu
From: Sricharan R <hidden>
Date: 2016-10-21 17:14:53
Also in:
linux-arm-msm, linux-iommu
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
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 <redacted> --- 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); + return 0; out_free:
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