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From:   Vivek Gautam <vivek.gautam@codeaurora.org>
To:     joro@8bytes.org, robh+dt@kernel.org, mark.rutland@arm.com,
        robin.murphy@arm.com, will.deacon@arm.com,
        iommu@lists.linux-foundation.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     alex.williamson@redhat.com, rjw@rjwysocki.net, robdclark@gmail.com,
        linux-pm@vger.kernel.org, freedreno@lists.freedesktop.org,
        sboyd@kernel.org, tfiga@chromium.org, sricharan@codeaurora.org,
        m.szyprowski@samsung.com, architt@codeaurora.org,
        linux-arm-msm@vger.kernel.org, jcrouse@codeaurora.org,
        vivek.gautam@codeaurora.org, Lukas Wunner <lukas@wunner.de>
Subject: [PATCH v12 3/4] iommu/arm-smmu: Add the device_link between masters and smmu
Date:   Sun,  8 Jul 2018 23:04:12 +0530
Message-Id: <20180708173413.1965-4-vivek.gautam@codeaurora.org>
In-Reply-To: <20180708173413.1965-1-vivek.gautam@codeaurora.org>
References: <20180708173413.1965-1-vivek.gautam@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Lukas Wunner <lukas@wunner.de>
---

 - Change since v11
   * Replaced DL_FLAG_AUTOREMOVE flag with DL_FLAG_AUTOREMOVE_SUPPLIER.

 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 09265e206e2d..916cde4954d2 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_SUPPLIER)) {
+		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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