linux-kernel - [PATCH v2 03/12] iommu/mediatek: Add device_link between the consumer and the larb devices

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Date:   Mon, 10 Jun 2019 20:55:04 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Evan Green <evgreen@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        Tomasz Figa <tfiga@...gle.com>,
        Will Deacon <will.deacon@....com>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <yingjoe.chen@...iatek.com>,
        <yong.wu@...iatek.com>, <youlin.pei@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>
Subject: [PATCH v2 03/12] iommu/mediatek: Add device_link between the consumer and the larb devices

MediaTek IOMMU don't have its power-domain. all the consumer connect
with smi-larb, then connect with smi-common.

        M4U
         |
    smi-common
         |
  -------------
  |         |    ...
  |         |
larb1     larb2
  |         |
vdec       venc

When the consumer works, it should enable the smi-larb's power which
also need enable the smi-common's power firstly.

Thus, First of all, use the device link connect the consumer and the
smi-larbs. then add device link between the smi-larb and smi-common.

This patch adds device_link between the consumer and the larbs.

Suggested-by: Tomasz Figa <tfiga@...omium.org>
Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/mtk_iommu.c    | 12 ++++++++++++
 drivers/iommu/mtk_iommu_v1.c | 13 ++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index f7599d8..7b70574 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -440,6 +440,9 @@ static int mtk_iommu_add_device(struct device *dev)
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct mtk_iommu_data *data;
 	struct iommu_group *group;
+	struct device_link *link;
+	struct device *larbdev;
+	unsigned int larbid;
 
 	if (!fwspec || fwspec->ops != &mtk_iommu_ops)
 		return -ENODEV; /* Not a iommu client device */
@@ -451,6 +454,15 @@ static int mtk_iommu_add_device(struct device *dev)
 	if (IS_ERR(group))
 		return PTR_ERR(group);
 
+	/* Link the consumer device with the smi-larb device(supplier) */
+	larbid = MTK_M4U_TO_LARB(fwspec->ids[0]);
+	larbdev = data->smi_imu.larb_imu[larbid].dev;
+	link = device_link_add(dev, larbdev,
+			       DL_FLAG_PM_RUNTIME |
+			       DL_FLAG_AUTOREMOVE_CONSUMER);
+	if (!link)
+		dev_err(dev, "Unable to link %s\n", dev_name(larbdev));
+
 	iommu_group_put(group);
 	return 0;
 }
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index c43c4a0..845e20b 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -423,7 +423,9 @@ static int mtk_iommu_add_device(struct device *dev)
 	struct of_phandle_iterator it;
 	struct mtk_iommu_data *data;
 	struct iommu_group *group;
-	int err;
+	struct device_link *link;
+	struct device *larbdev;
+	int err, larbid;
 
 	of_for_each_phandle(&it, err, dev->of_node, "iommus",
 			"#iommu-cells", 0) {
@@ -466,6 +468,15 @@ static int mtk_iommu_add_device(struct device *dev)
 		return err;
 	}
 
+	/* Link the consumer device with the smi-larb device(supplier) */
+	larbid = mt2701_m4u_to_larb(fwspec->ids[0]);
+	larbdev = data->smi_imu.larb_imu[larbid].dev;
+	link = device_link_add(dev, larbdev,
+			       DL_FLAG_PM_RUNTIME |
+			       DL_FLAG_AUTOREMOVE_CONSUMER);
+	if (!link)
+		dev_err(dev, "Unable to link %s\n", dev_name(larbdev));
+
 	return iommu_device_link(&data->iommu, dev);
 }
 
-- 
1.9.1