On 19/01/18 11:43, Vivek Gautam wrote:
From: Sricharan R <sricharan@xxxxxxxxxxxxxx>
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.
Don't we need to balance this with a device_link_del() in .remove_device
(like exynos-iommu does)?
Robin.
Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx>
---
drivers/iommu/arm-smmu.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 95478bfb182c..33bbcfedb896 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1367,6 +1367,7 @@ static int arm_smmu_add_device(struct device *dev)
struct arm_smmu_device *smmu;
struct arm_smmu_master_cfg *cfg;
struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+ struct device_link *link;
int i, ret;
if (using_legacy_binding) {
@@ -1428,6 +1429,16 @@ 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.
+ */
+ link = device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME);
+ if (!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_cfg_free:
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