Date:   Fri,  9 Jul 2021 12:23:20 +1000
From:   Eizan Miyamoto <eizan@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     wenst@...omium.org, chunkuang.hu@...nel.org, yong.wu@...iatek.com,
        enric.balletbo@...labora.com, houlong.wei@...iatek.com,
        Eizan Miyamoto <eizan@...omium.org>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH v5 4/8] mtk-mdp: soc: mediatek: register mdp from mmsys

Rather than hanging the MDP master component driver off of the rdma0
device, create a "virtual" device by the mmsys driver instead which is
probed by the mtk_mdp_core driver.

Broadly, four interdependent things are done by this change:
- A virtual device that is probed by the mtk_mdp_core driver is
  instantiated by the mtk_mmsys driver.
- Presence of a mediatek,vpu property in a child node to the mmsys
  device node is used to determine what device to use when dispatching
  dma ops from the relevant ioctl.
- v4l-related setup is moved into from the mtk_mdp_core driver to the
  mtk_mdp_comp driver.

Signed-off-by: Eizan Miyamoto <eizan@...omium.org>

---

Changes in v5:
- rebase and build-test on 5.13-next @ e2f74b13dbe6

Changes in v4:
- rebase and test on 5.13
- don't depend on https://patchwork.kernel.org/project/linux-mediatek/list/?series=464873

Changes in v3:
- get mdp master from aliases instead of strcmp against of_node->name

Changes in v2:
- rebased onto Linux 5.12
- 100 char line length allowance was utilized in a few places
- Removal of a redundant dev_err() print at the end of
  mtk_mdp_comp_init()
- Instead of printing errors and ignoring them, I've added a patch to
  correctly propagate them.
- Use of C style comments.
- Three additional patches were added to eliminate dependency on the
  mediatek,vpu property inside the mdp_rdma0 device node.

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 51 ++++++++++-----
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 62 ++++++-------------
 drivers/media/platform/mtk-mdp/mtk_mdp_core.h |  2 +
 drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c  |  4 +-
 drivers/soc/mediatek/mtk-mmsys.c              | 20 +++++-
 5 files changed, 79 insertions(+), 60 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index ce54863c24ce..0ee6c7d65664 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -114,8 +114,45 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
 {
 	struct mtk_mdp_comp *comp = dev_get_drvdata(dev);
 	struct mtk_mdp_dev *mdp = data;
+	struct device_node *vpu_node;
 
 	mtk_mdp_register_component(mdp, comp);
+
+	/*
+	 * If this component has a "mediatek-vpu" property, it is responsible for
+	 * notifying the mdp master driver about it so it can be further initialized
+	 * later.
+	 */
+	vpu_node = of_parse_phandle(dev->of_node, "mediatek,vpu", 0);
+	if (vpu_node) {
+		int ret;
+
+		mdp->vpu_dev = of_find_device_by_node(vpu_node);
+		if (WARN_ON(!mdp->vpu_dev)) {
+			dev_err(dev, "vpu pdev failed\n");
+			of_node_put(vpu_node);
+		}
+
+		ret = v4l2_device_register(dev, &mdp->v4l2_dev);
+		if (ret) {
+			dev_err(dev, "Failed to register v4l2 device\n");
+			return -EINVAL;
+		}
+
+		ret = vb2_dma_contig_set_max_seg_size(dev, DMA_BIT_MASK(32));
+		if (ret) {
+			dev_err(dev, "Failed to set vb2 dma mag seg size\n");
+			return -EINVAL;
+		}
+
+		/*
+		 * presence of the "mediatek,vpu" property in a device node
+		 * indicates that it is the primary MDP rdma device and MDP DMA
+		 * ops should be handled by its DMA callbacks.
+		 */
+		mdp->rdma_dev = dev;
+	}
+
 	pm_runtime_enable(dev);
 
 	return 0;
@@ -198,23 +235,9 @@ int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev)
 static int mtk_mdp_comp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *vpu_node;
 	int status;
 	struct mtk_mdp_comp *comp;
 
-	vpu_node = of_parse_phandle(dev->of_node, "mediatek,vpu", 0);
-	if (vpu_node) {
-		of_node_put(vpu_node);
-		/*
-		 * The device tree node with a mediatek,vpu property is deemed
-		 * the MDP "master" device, we don't want to add a component
-		 * for it in this function because the initialization for the
-		 * master is done elsewhere.
-		 */
-		dev_info(dev, "vpu node found, not probing\n");
-		return -ENODEV;
-	}
-
 	comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
 	if (!comp)
 		return -ENOMEM;
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index 3558a6587f51..9af3dc0e204a 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -122,6 +122,17 @@ static int mtk_mdp_master_bind(struct device *dev)
 		goto err_component_bind_all;
 	}
 
+	if (mdp->vpu_dev) {
+		int ret = vpu_wdt_reg_handler(mdp->vpu_dev, mtk_mdp_reset_handler, mdp,
+					  VPU_RST_MDP);
+		if (ret) {
+			dev_err(dev, "Failed to register reset handler\n");
+			goto err_wdt_reg;
+		}
+	} else {
+		dev_err(dev, "no vpu_dev found\n");
+	}
+
 	status = mtk_mdp_register_m2m_device(mdp);
 	if (status) {
 		dev_err(dev, "Failed to register m2m device: %d\n", status);
@@ -134,6 +145,8 @@ static int mtk_mdp_master_bind(struct device *dev)
 	return 0;
 
 err_mtk_mdp_register_m2m_device:
+
+err_wdt_reg:
 	component_unbind_all(dev, mdp);
 
 err_component_bind_all:
@@ -192,8 +205,13 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 		of_node_put(node);
 		parent = dev->of_node;
 		dev_warn(dev, "device tree is out of date\n");
-	} else {
+	} else if (dev->of_node) {
 		parent = dev->of_node->parent;
+	} else if (dev->parent) {
+		/* maybe we were created from a call to platform_device_register_data() */
+		parent = dev->parent->parent->of_node;
+	} else {
+		return -ENODEV;
 	}
 
 	/* Iterate over sibling MDP function blocks */
@@ -226,16 +244,6 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 		}
 	}
 
-	/*
-	 * Create a component for myself so that clocks can be toggled in
-	 * clock_on().
-	 */
-	ret = mtk_mdp_comp_init(&mdp->comp_self, dev);
-	if (ret) {
-		dev_err(dev, "Failed to initialize component\n");
-		goto err_comp;
-	}
-
 	mdp->job_wq = create_singlethread_workqueue(MTK_MDP_MODULE_NAME);
 	if (!mdp->job_wq) {
 		dev_err(&pdev->dev, "unable to alloc job workqueue\n");
@@ -251,29 +259,8 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 	}
 	INIT_WORK(&mdp->wdt_work, mtk_mdp_wdt_worker);
 
-	ret = v4l2_device_register(dev, &mdp->v4l2_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to register v4l2 device\n");
-		ret = -EINVAL;
-		goto err_dev_register;
-	}
-
-	mdp->vpu_dev = vpu_get_plat_device(pdev);
-	ret = vpu_wdt_reg_handler(mdp->vpu_dev, mtk_mdp_reset_handler, mdp,
-				  VPU_RST_MDP);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to register reset handler\n");
-		goto err_wdt_reg;
-	}
-
 	platform_set_drvdata(pdev, mdp);
 
-	ret = vb2_dma_contig_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to set vb2 dma mag seg size\n");
-		goto err_set_max_seg_size;
-	}
-
 	ret = component_master_add_with_match(dev, &mtk_mdp_com_ops, match);
 	if (ret) {
 		dev_err(dev, "Component master add failed\n");
@@ -285,22 +272,12 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 	return 0;
 
 err_component_master_add:
-	vb2_dma_contig_clear_max_seg_size(&pdev->dev);
-
-err_set_max_seg_size:
-
-err_wdt_reg:
-	v4l2_device_unregister(&mdp->v4l2_dev);
-
-err_dev_register:
 	destroy_workqueue(mdp->wdt_wq);
 
 err_alloc_wdt_wq:
 	destroy_workqueue(mdp->job_wq);
 
 err_alloc_job_wq:
-
-err_comp:
 	dev_dbg(dev, "err %d\n", ret);
 	return ret;
 }
@@ -372,7 +349,6 @@ static struct platform_driver mtk_mdp_driver = {
 	.driver = {
 		.name	= MTK_MDP_MODULE_NAME,
 		.pm	= &mtk_mdp_pm_ops,
-		.of_match_table = mtk_mdp_of_ids,
 	}
 };
 
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.h b/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
index 8a52539b15d4..9fcd8b8e7c25 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
@@ -133,6 +133,7 @@ struct mtk_mdp_variant {
  * struct mtk_mdp_dev - abstraction for image processor entity
  * @lock:	the mutex protecting this data structure
  * @vpulock:	the mutex protecting the communication with VPU
+ * @rdma_dev:  device pointer to rdma device for MDP
  * @pdev:	pointer to the image processor platform device
  * @variant:	the IP variant information
  * @id:		image processor device index (0..MTK_MDP_MAX_DEVS)
@@ -151,6 +152,7 @@ struct mtk_mdp_variant {
 struct mtk_mdp_dev {
 	struct mutex			lock;
 	struct mutex			vpulock;
+	struct device			*rdma_dev;
 	struct platform_device		*pdev;
 	struct mtk_mdp_variant		*variant;
 	u16				id;
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c b/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
index f14779e7596e..9834d3bbe851 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
@@ -929,7 +929,7 @@ static int mtk_mdp_m2m_queue_init(void *priv, struct vb2_queue *src_vq,
 	src_vq->mem_ops = &vb2_dma_contig_memops;
 	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
-	src_vq->dev = &ctx->mdp_dev->pdev->dev;
+	src_vq->dev = ctx->mdp_dev->rdma_dev;
 	src_vq->lock = &ctx->mdp_dev->lock;
 
 	ret = vb2_queue_init(src_vq);
@@ -944,7 +944,7 @@ static int mtk_mdp_m2m_queue_init(void *priv, struct vb2_queue *src_vq,
 	dst_vq->mem_ops = &vb2_dma_contig_memops;
 	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
-	dst_vq->dev = &ctx->mdp_dev->pdev->dev;
+	dst_vq->dev = ctx->mdp_dev->rdma_dev;
 	dst_vq->lock = &ctx->mdp_dev->lock;
 
 	return vb2_queue_init(dst_vq);
diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
index 080660ef11bf..e681029fe804 100644
--- a/drivers/soc/mediatek/mtk-mmsys.c
+++ b/drivers/soc/mediatek/mtk-mmsys.c
@@ -97,6 +97,7 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
 	struct platform_device *clks;
 	struct platform_device *drm;
 	struct mtk_mmsys *mmsys;
+	struct platform_device *mdp;
 	int ret;
 
 	mmsys = devm_kzalloc(dev, sizeof(*mmsys), GFP_KERNEL);
@@ -122,10 +123,27 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
 					    PLATFORM_DEVID_AUTO, NULL, 0);
 	if (IS_ERR(drm)) {
 		platform_device_unregister(clks);
-		return PTR_ERR(drm);
+		ret = PTR_ERR(drm);
+		goto err_drm;
+	}
+
+	mdp = platform_device_register_data(&pdev->dev, "mtk-mdp",
+					    PLATFORM_DEVID_AUTO, NULL, 0);
+	if (IS_ERR(mdp)) {
+		ret = PTR_ERR(mdp);
+		dev_err(dev, "Failed to register mdp: %d\n", ret);
+		goto err_mdp;
 	}
 
 	return 0;
+
+err_mdp:
+	platform_device_unregister(drm);
+
+err_drm:
+	platform_device_unregister(clks);
+
+	return ret;
 }
 
 static const struct of_device_id of_match_mtk_mmsys[] = {
-- 
2.32.0.93.g670b81a890-goog

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