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Add a devlink between the clients and SMMU device. The absence of a power domain effectively disables runtime power management. Reviewed-by: Mostafa Saleh Signed-off-by: Pranjal Shrivastava --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 44875c526183..49a3a46994b1 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -3685,6 +3685,9 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) pci_prepare_ats(to_pci_dev(dev), stu); } + device_link_add(dev, smmu->dev, + DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER); + return &smmu->iommu; err_free_master: @@ -4992,11 +4995,18 @@ static int arm_smmu_device_probe(struct platform_device *pdev) if (ret) goto err_disable; + if (dev->pm_domain) { + pm_runtime_set_active(dev); + pm_runtime_use_autosuspend(dev); + pm_runtime_set_autosuspend_delay(dev, RPM_AUTOSUSPEND_DELAY_MS); + pm_runtime_enable(dev); + } + /* And we're up. Go go go! */ ret = iommu_device_sysfs_add(&smmu->iommu, dev, NULL, "smmu3.%pa", &ioaddr); if (ret) - goto err_disable; + goto err_rpm_disable; ret = iommu_device_register(&smmu->iommu, &arm_smmu_ops, dev); if (ret) { @@ -5008,6 +5018,8 @@ static int arm_smmu_device_probe(struct platform_device *pdev) err_free_sysfs: iommu_device_sysfs_remove(&smmu->iommu); +err_rpm_disable: + pm_runtime_disable(dev); err_disable: arm_smmu_device_disable(smmu); err_free_iopf: -- 2.52.0.rc1.455.g30608eb744-goog