linux-kernel - [PATCH v11 3/4] iommu/arm-smmu: Add the device

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Date:   Thu, 22 Mar 2018 15:52:03 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     joro@...tes.org, robh+dt@...nel.org, mark.rutland@....com,
        robin.murphy@....com, will.deacon@....com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     rjw@...ysocki.net, robdclark@...il.com, sboyd@...eaurora.org,
        sricharan@...eaurora.org, m.szyprowski@...sung.com,
        architt@...eaurora.org, lukas@...ner.de, tfiga@...omium.org,
        linux-arm-msm@...r.kernel.org, vivek.gautam@...eaurora.org
Subject: [PATCH v11 3/4] iommu/arm-smmu: Add the device_link between masters and smmu

From: Sricharan R <sricharan@...eaurora.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@...eaurora.org>
Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
Reviewed-by: Tomasz Figa <tfiga@...omium.org>
---
 drivers/iommu/arm-smmu.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 3383c6657857..da50fd979d5f 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1461,8 +1461,20 @@ static int arm_smmu_add_device(struct device *dev)
 
 	iommu_device_link(&smmu->iommu, dev);
 
+	if (pm_runtime_enabled(smmu->dev) &&
+	    !device_link_add(dev, smmu->dev,
+			     DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE)) {
+		dev_err(smmu->dev, "Unable to add link to the consumer %s\n",
+			dev_name(dev));
+		ret = -ENODEV;
+		goto out_unlink;
+	}
+
 	return 0;
 
+out_unlink:
+	iommu_device_unlink(&smmu->iommu, dev);
+	arm_smmu_master_free_smes(fwspec);
 out_cfg_free:
 	kfree(cfg);
 out_free:
-- 
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