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Subject[PATCH v7 4/6] iommu/arm-smmu: Add the device_link between masters and smmu
Date
From: Sricharan R <sricharan@codeaurora.org>

Finally add the device link between the master device and
smmu, so that the smmu gets runtime enabled/disabled only when the
master needs it. This is done from add_device callback which gets
called once when the master is added to the smmu.

Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
---
drivers/iommu/arm-smmu.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index c024f69c1682..c7e924d553bd 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -215,6 +215,9 @@ struct arm_smmu_device {

/* IOMMU core code handle */
struct iommu_device iommu;
+
+ /* runtime PM link to master */
+ struct device_link *link;
};

enum arm_smmu_context_fmt {
@@ -1425,6 +1428,17 @@ static int arm_smmu_add_device(struct device *dev)

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.
+ */
+ smmu->link = device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME);
+ if (!smmu->link)
+ dev_warn(smmu->dev,
+ "Unable to create device link between %s and %s\n",
+ dev_name(smmu->dev), dev_name(dev));
+
return 0;

out_rpm_put:
@@ -1449,6 +1463,8 @@ static void arm_smmu_remove_device(struct device *dev)
cfg = fwspec->iommu_priv;
smmu = cfg->smmu;

+ device_link_del(smmu->link);
+
ret = pm_runtime_get_sync(smmu->dev);
if (ret)
return;
--
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of Code Aurora Forum, hosted by The Linux Foundation
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