[PATCH v5 0/8] Refactor MTK MDP driver into core/components

[PATCH v5 0/8] Refactor MTK MDP driver into core/components

[Eizan Miyamoto]

This is an update to
https://patchwork.kernel.org/project/linux-mediatek/list/?series=283075
To address some comments and fixes.

This series has been verified to work on 5.13.


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.

Eizan Miyamoto (8):
  mtk-mdp: add driver to probe mdp components
  mtk-mdp: use pm_runtime in MDP component driver
  media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on
  mtk-mdp: soc: mediatek: register mdp from mmsys
  media: mtk-mdp: search for vpu node instead of linking it to a
    property
  media: mtk-mdp: propagate errors better in pm_suspend/resume
  media: mtk-mdp: use mdp-rdma0 alias to point to MDP master
  dts: mtk-mdp: remove mediatek,vpu property from primary MDP device

 arch/arm64/boot/dts/mediatek/mt8173.dtsi      |   1 -
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 272 +++++++++++++++--
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  36 +--
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 281 ++++++++++++------
 drivers/media/platform/mtk-mdp/mtk_mdp_core.h |   3 +
 drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c  |   4 +-
 drivers/soc/mediatek/mtk-mmsys.c              |  20 +-
 7 files changed, 473 insertions(+), 144 deletions(-)

-- 
2.32.0.93.g670b81a890-goog


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[PATCH v5 1/8] mtk-mdp: add driver to probe mdp components

[Eizan Miyamoto]

Broadly, this patch (1) adds a driver for various MTK MDP components to
go alongside the main MTK MDP driver, and (2) hooks them all together
using the component framework.

(1) Up until now, the MTK MDP driver controls 8 devices in the device
tree on its own. When running tests for the hardware video decoder, we
found that the iommus and LARBs were not being properly configured. To
configure them, a driver for each be added to mtk_mdp_comp so that
mtk_iommu_add_device() can (eventually) be called from dma_configure()
inside really_probe().

(2) The integration into the component framework allows us to defer the
registration with the v4l2 subsystem until all the MDP-related devices
have been probed, so that the relevant device node does not become
available until initialization of all the components is complete.

Some notes about how the component framework has been integrated:

- The driver for the rdma0 component serves double duty as the "master"
  (aggregate) driver as well as a component driver. This is a non-ideal
  compromise until a better solution is developed. This device is
  differentiated from the rest by checking for a "mediatek,vpu" property
  in the device node.

- The list of mdp components remains hard-coded as mtk_mdp_comp_dt_ids[]
  in mtk_mdp_core.c, and as mtk_mdp_comp_driver_dt_match[] in
  mtk_mdp_comp.c. This unfortunate duplication of information is
  addressed in a following patch in this series.

- The component driver calls component_add() for each device that is
  probed.

- In mtk_mdp_probe (the "master" device), we scan the device tree for
  any matching nodes against mtk_mdp_comp_dt_ids, and add component
  matches for them. The match criteria is a matching device node
  pointer.

- When the set of components devices that have been probed corresponds
  with the list that is generated by the "master", the callback to
  mtk_mdp_master_bind() is made, which then calls the component bind
  functions.

- Inside mtk_mdp_master_bind(), once all the component bind functions
  have been called, we can then register our device to the v4l2
  subsystem.

- The call to pm_runtime_enable() in the master device is called after
  all the components have been registered by their bind() functions
  called by mtk_mtp_master_bind(). As a result, the list of components
  will not change while power management callbacks mtk_mdp_suspend()/
  resume() are accessing the list of components.

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

(no changes since v1)

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 156 +++++++++++++---
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  25 +--
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 175 +++++++++++++-----
 drivers/media/platform/mtk-mdp/mtk_mdp_core.h |   1 +
 4 files changed, 262 insertions(+), 95 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index b3426a551bea..aec1cb5c4261 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -5,14 +5,52 @@
  */
 
 #include <linux/clk.h>
+#include <linux/component.h>
 #include <linux/device.h>
-#include <linux/of.h>
+#include <linux/module.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <soc/mediatek/smi.h>
 
 #include "mtk_mdp_comp.h"
-
+#include "mtk_mdp_core.h"
+
+/**
+ * enum mtk_mdp_comp_type - the MDP component
+ * @MTK_MDP_RDMA:		Read DMA
+ * @MTK_MDP_RSZ:		Reszer
+ * @MTK_MDP_WDMA:		Write DMA
+ * @MTK_MDP_WROT:		Write DMA with rotation
+ * @MTK_MDP_COMP_TYPE_MAX:	Placeholder for num elems in this enum
+ */
+enum mtk_mdp_comp_type {
+	MTK_MDP_RDMA,
+	MTK_MDP_RSZ,
+	MTK_MDP_WDMA,
+	MTK_MDP_WROT,
+	MTK_MDP_COMP_TYPE_MAX,
+};
+
+static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
+	{
+		.compatible = "mediatek,mt8173-mdp-rdma",
+		.data = (void *)MTK_MDP_RDMA
+	}, {
+		.compatible = "mediatek,mt8173-mdp-rsz",
+		.data = (void *)MTK_MDP_RSZ
+	}, {
+		.compatible = "mediatek,mt8173-mdp-wdma",
+		.data = (void *)MTK_MDP_WDMA
+	}, {
+		.compatible = "mediatek,mt8173-mdp-wrot",
+		.data = (void *)MTK_MDP_WROT
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
 
 void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
 {
@@ -21,9 +59,8 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
 	if (comp->larb_dev) {
 		err = mtk_smi_larb_get(comp->larb_dev);
 		if (err)
-			dev_err(dev,
-				"failed to get larb, err %d. type:%d\n",
-				err, comp->type);
+			dev_err(comp->dev,
+				"failed to get larb, err %d.\n", err);
 	}
 
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
@@ -32,8 +69,8 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
 		err = clk_prepare_enable(comp->clk[i]);
 		if (err)
 			dev_err(dev,
-			"failed to enable clock, err %d. type:%d i:%d\n",
-				err, comp->type, i);
+				"failed to enable clock, err %d. i:%d\n",
+				err, i);
 	}
 }
 
@@ -51,17 +88,42 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
 		mtk_smi_larb_put(comp->larb_dev);
 }
 
-int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
-		      struct mtk_mdp_comp *comp,
-		      enum mtk_mdp_comp_type comp_type)
+static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
+			void *data)
+{
+	struct mtk_mdp_comp *comp = dev_get_drvdata(dev);
+	struct mtk_mdp_dev *mdp = data;
+
+	mtk_mdp_register_component(mdp, comp);
+
+	return 0;
+}
+
+static void mtk_mdp_comp_unbind(struct device *dev, struct device *master,
+			   void *data)
+{
+	struct mtk_mdp_dev *mdp = data;
+	struct mtk_mdp_comp *comp = dev_get_drvdata(dev);
+
+	mtk_mdp_unregister_component(mdp, comp);
+}
+
+static const struct component_ops mtk_mdp_component_ops = {
+	.bind   = mtk_mdp_comp_bind,
+	.unbind = mtk_mdp_comp_unbind,
+};
+
+int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev)
 {
 	struct device_node *larb_node;
 	struct platform_device *larb_pdev;
 	int ret;
 	int i;
+	struct device_node *node = dev->of_node;
+	enum mtk_mdp_comp_type comp_type =
+		 (enum mtk_mdp_comp_type)of_device_get_match_data(dev);
 
-	comp->dev_node = of_node_get(node);
-	comp->type = comp_type;
+	INIT_LIST_HEAD(&comp->node);
 
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 		comp->clk[i] = of_clk_get(node, i);
@@ -69,19 +131,19 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
 			if (PTR_ERR(comp->clk[i]) != -EPROBE_DEFER)
 				dev_err(dev, "Failed to get clock\n");
 			ret = PTR_ERR(comp->clk[i]);
-			goto put_dev;
+			goto err;
 		}
 
 		/* Only RDMA needs two clocks */
-		if (comp->type != MTK_MDP_RDMA)
+		if (comp_type != MTK_MDP_RDMA)
 			break;
 	}
 
 	/* Only DMA capable components need the LARB property */
 	comp->larb_dev = NULL;
-	if (comp->type != MTK_MDP_RDMA &&
-	    comp->type != MTK_MDP_WDMA &&
-	    comp->type != MTK_MDP_WROT)
+	if (comp_type != MTK_MDP_RDMA &&
+	    comp_type != MTK_MDP_WDMA &&
+	    comp_type != MTK_MDP_WROT)
 		return 0;
 
 	larb_node = of_parse_phandle(node, "mediatek,larb", 0);
@@ -89,7 +151,7 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
 		dev_err(dev,
 			"Missing mediadek,larb phandle in %pOF node\n", node);
 		ret = -EINVAL;
-		goto put_dev;
+		goto err;
 	}
 
 	larb_pdev = of_find_device_by_node(larb_node);
@@ -97,7 +159,7 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
 		dev_warn(dev, "Waiting for larb device %pOF\n", larb_node);
 		of_node_put(larb_node);
 		ret = -EPROBE_DEFER;
-		goto put_dev;
+		goto err;
 	}
 	of_node_put(larb_node);
 
@@ -105,13 +167,59 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
 
 	return 0;
 
-put_dev:
-	of_node_put(comp->dev_node);
-
+err:
 	return ret;
 }
 
-void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp)
+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;
+
+	status = mtk_mdp_comp_init(comp, dev);
+	if (status) {
+		dev_err(dev, "Failed to initialize component: %d\n", status);
+		return status;
+	}
+
+	dev_set_drvdata(dev, comp);
+
+	return component_add(dev, &mtk_mdp_component_ops);
+}
+
+static int mtk_mdp_comp_remove(struct platform_device *pdev)
 {
-	of_node_put(comp->dev_node);
+	struct device *dev = &pdev->dev;
+
+	component_del(dev, &mtk_mdp_component_ops);
+	return 0;
 }
+
+struct platform_driver mtk_mdp_component_driver = {
+	.probe          = mtk_mdp_comp_probe,
+	.remove         = mtk_mdp_comp_remove,
+	.driver         = {
+		.name   = "mediatek-mdp-comp",
+		.owner  = THIS_MODULE,
+		.of_match_table = mtk_mdp_comp_driver_dt_match,
+	},
+};
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
index 7897766c96bb..b5a18fe567aa 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
@@ -7,42 +7,23 @@
 #ifndef __MTK_MDP_COMP_H__
 #define __MTK_MDP_COMP_H__
 
-/**
- * enum mtk_mdp_comp_type - the MDP component
- * @MTK_MDP_RDMA:	Read DMA
- * @MTK_MDP_RSZ:	Riszer
- * @MTK_MDP_WDMA:	Write DMA
- * @MTK_MDP_WROT:	Write DMA with rotation
- */
-enum mtk_mdp_comp_type {
-	MTK_MDP_RDMA,
-	MTK_MDP_RSZ,
-	MTK_MDP_WDMA,
-	MTK_MDP_WROT,
-};
-
 /**
  * struct mtk_mdp_comp - the MDP's function component data
  * @node:	list node to track sibing MDP components
- * @dev_node:	component device node
  * @clk:	clocks required for component
  * @larb_dev:	SMI device required for component
- * @type:	component type
  */
 struct mtk_mdp_comp {
 	struct list_head	node;
-	struct device_node	*dev_node;
 	struct clk		*clk[2];
 	struct device		*larb_dev;
-	enum mtk_mdp_comp_type	type;
 };
 
-int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
-		      struct mtk_mdp_comp *comp,
-		      enum mtk_mdp_comp_type comp_type);
-void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp);
+int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
+
 void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp);
 void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp);
 
+extern struct platform_driver mtk_mdp_component_driver;
 
 #endif /* __MTK_MDP_COMP_H__ */
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index 976aa1f4829b..aca236dbd348 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/component.h>
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/interrupt.h>
@@ -19,6 +20,7 @@
 #include <linux/workqueue.h>
 #include <soc/mediatek/smi.h>
 
+#include "mtk_mdp_comp.h"
 #include "mtk_mdp_core.h"
 #include "mtk_mdp_m2m.h"
 #include "mtk_vpu.h"
@@ -32,16 +34,12 @@ module_param(mtk_mdp_dbg_level, int, 0644);
 static const struct of_device_id mtk_mdp_comp_dt_ids[] = {
 	{
 		.compatible = "mediatek,mt8173-mdp-rdma",
-		.data = (void *)MTK_MDP_RDMA
 	}, {
 		.compatible = "mediatek,mt8173-mdp-rsz",
-		.data = (void *)MTK_MDP_RSZ
 	}, {
 		.compatible = "mediatek,mt8173-mdp-wdma",
-		.data = (void *)MTK_MDP_WDMA
 	}, {
 		.compatible = "mediatek,mt8173-mdp-wrot",
-		.data = (void *)MTK_MDP_WROT
 	},
 	{ },
 };
@@ -91,6 +89,64 @@ static void mtk_mdp_reset_handler(void *priv)
 	queue_work(mdp->wdt_wq, &mdp->wdt_work);
 }
 
+static int compare_of(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+static void release_of(struct device *dev, void *data)
+{
+	of_node_put(data);
+}
+
+static int mtk_mdp_master_bind(struct device *dev)
+{
+	int status;
+	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
+
+	mtk_mdp_register_component(mdp, &mdp->comp_self);
+
+	status = component_bind_all(dev, mdp);
+	if (status) {
+		dev_err(dev, "Failed to bind all components: %d\n", status);
+		goto err_component_bind_all;
+	}
+
+	status = mtk_mdp_register_m2m_device(mdp);
+	if (status) {
+		dev_err(dev, "Failed to register m2m device: %d\n", status);
+		v4l2_err(&mdp->v4l2_dev, "Failed to init mem2mem device\n");
+		goto err_mtk_mdp_register_m2m_device;
+	}
+
+	pm_runtime_enable(dev);
+
+	return 0;
+
+err_mtk_mdp_register_m2m_device:
+	component_unbind_all(dev, mdp);
+
+err_component_bind_all:
+	mtk_mdp_unregister_component(mdp, &mdp->comp_self);
+
+	return status;
+}
+
+static void mtk_mdp_master_unbind(struct device *dev)
+{
+	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
+
+	pm_runtime_disable(dev);
+	mtk_mdp_unregister_m2m_device(mdp);
+	component_unbind_all(dev, mdp);
+	mtk_mdp_unregister_component(mdp, &mdp->comp_self);
+}
+
+static const struct component_master_ops mtk_mdp_com_ops = {
+	.bind		= mtk_mdp_master_bind,
+	.unbind		= mtk_mdp_master_unbind,
+};
+
 void mtk_mdp_register_component(struct mtk_mdp_dev *mdp,
 				struct mtk_mdp_comp *comp)
 {
@@ -108,8 +164,8 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 	struct mtk_mdp_dev *mdp;
 	struct device *dev = &pdev->dev;
 	struct device_node *node, *parent;
-	struct mtk_mdp_comp *comp, *comp_temp;
-	int ret = 0;
+	int i, ret = 0;
+	struct component_match *match = NULL;
 
 	mdp = devm_kzalloc(dev, sizeof(*mdp), GFP_KERNEL);
 	if (!mdp)
@@ -134,36 +190,43 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 	}
 
 	/* Iterate over sibling MDP function blocks */
+	i = 0;
 	for_each_child_of_node(parent, node) {
-		const struct of_device_id *of_id;
-		enum mtk_mdp_comp_type comp_type;
+		struct platform_device *pdev;
 
-		of_id = of_match_node(mtk_mdp_comp_dt_ids, node);
-		if (!of_id)
+		if (!of_match_node(mtk_mdp_comp_dt_ids, node))
 			continue;
 
-		if (!of_device_is_available(node)) {
-			dev_err(dev, "Skipping disabled component %pOF\n",
-				node);
+		if (!of_device_is_available(node))
 			continue;
-		}
 
-		comp_type = (enum mtk_mdp_comp_type)of_id->data;
-
-		comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
-		if (!comp) {
-			ret = -ENOMEM;
-			of_node_put(node);
-			goto err_comp;
+		pdev = of_find_device_by_node(node);
+		if (!pdev) {
+			dev_warn(dev, "Unable to find comp device %s\n",
+				 node->full_name);
+			continue;
 		}
 
-		ret = mtk_mdp_comp_init(dev, node, comp, comp_type);
-		if (ret) {
-			of_node_put(node);
-			goto err_comp;
+		/*
+		 * Do not add a match for my own (rdma0) device node.
+		 * I will be managing it directly instead using comp_self.
+		 */
+		if (&pdev->dev != dev) {
+			dev_dbg(dev, "adding match %d for: %pOF\n", i++, node);
+			component_match_add_release(dev, &match, release_of,
+						    compare_of,
+						    of_node_get(node));
 		}
+	}
 
-		mtk_mdp_register_component(mdp, comp);
+	/*
+	 * 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);
@@ -188,18 +251,12 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 		goto err_dev_register;
 	}
 
-	ret = mtk_mdp_register_m2m_device(mdp);
-	if (ret) {
-		v4l2_err(&mdp->v4l2_dev, "Failed to init mem2mem device\n");
-		goto err_m2m_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_m2m_register;
+		goto err_wdt_reg;
 	}
 
 	platform_set_drvdata(pdev, mdp);
@@ -207,15 +264,25 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 	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_m2m_register;
+		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");
+		goto err_component_master_add;
 	}
 
-	pm_runtime_enable(dev);
 	dev_dbg(dev, "mdp-%d registered successfully\n", mdp->id);
 
 	return 0;
 
-err_m2m_register:
+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:
@@ -227,11 +294,6 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 err_alloc_job_wq:
 
 err_comp:
-	list_for_each_entry_safe(comp, comp_temp, &mdp->comp_list, node) {
-		mtk_mdp_unregister_component(mdp, comp);
-		mtk_mdp_comp_deinit(dev, comp);
-	}
-
 	dev_dbg(dev, "err %d\n", ret);
 	return ret;
 }
@@ -239,11 +301,10 @@ static int mtk_mdp_probe(struct platform_device *pdev)
 static int mtk_mdp_remove(struct platform_device *pdev)
 {
 	struct mtk_mdp_dev *mdp = platform_get_drvdata(pdev);
-	struct mtk_mdp_comp *comp, *comp_temp;
 
-	pm_runtime_disable(&pdev->dev);
+	component_master_del(&pdev->dev, &mtk_mdp_com_ops);
+
 	vb2_dma_contig_clear_max_seg_size(&pdev->dev);
-	mtk_mdp_unregister_m2m_device(mdp);
 	v4l2_device_unregister(&mdp->v4l2_dev);
 
 	flush_workqueue(mdp->wdt_wq);
@@ -252,10 +313,8 @@ static int mtk_mdp_remove(struct platform_device *pdev)
 	flush_workqueue(mdp->job_wq);
 	destroy_workqueue(mdp->job_wq);
 
-	list_for_each_entry_safe(comp, comp_temp, &mdp->comp_list, node) {
-		mtk_mdp_unregister_component(mdp, comp);
-		mtk_mdp_comp_deinit(&pdev->dev, comp);
-	}
+	if (!list_empty(&mdp->comp_list))
+		dev_err(&pdev->dev, "not all components removed\n");
 
 	dev_dbg(&pdev->dev, "%s driver unloaded\n", pdev->name);
 	return 0;
@@ -310,7 +369,25 @@ static struct platform_driver mtk_mdp_driver = {
 	}
 };
 
-module_platform_driver(mtk_mdp_driver);
+static struct platform_driver * const mtk_mdp_drivers[] = {
+	&mtk_mdp_driver,
+	&mtk_mdp_component_driver,
+};
+
+static int __init mtk_mdp_init(void)
+{
+	return platform_register_drivers(mtk_mdp_drivers,
+					 ARRAY_SIZE(mtk_mdp_drivers));
+}
+
+static void __exit mtk_mdp_exit(void)
+{
+	platform_unregister_drivers(mtk_mdp_drivers,
+				    ARRAY_SIZE(mtk_mdp_drivers));
+}
+
+module_init(mtk_mdp_init);
+module_exit(mtk_mdp_exit);
 
 MODULE_AUTHOR("Houlong Wei <houlong.wei@mediatek.com>");
 MODULE_DESCRIPTION("Mediatek image processor driver");
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.h b/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
index a6e6dc36307b..8a52539b15d4 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
@@ -155,6 +155,7 @@ struct mtk_mdp_dev {
 	struct mtk_mdp_variant		*variant;
 	u16				id;
 	struct list_head		comp_list;
+	struct mtk_mdp_comp		comp_self;
 	struct v4l2_m2m_dev		*m2m_dev;
 	struct list_head		ctx_list;
 	struct video_device		*vdev;
-- 
2.32.0.93.g670b81a890-goog


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Re: [PATCH v5 1/8] mtk-mdp: add driver to probe mdp components

[Enric Balletbo i Serra]

Hi Eizan,

Thank you for your patch.

On 9/7/21 4:23, Eizan Miyamoto wrote:
> Broadly, this patch (1) adds a driver for various MTK MDP components to
> go alongside the main MTK MDP driver, and (2) hooks them all together
> using the component framework.
> 
> (1) Up until now, the MTK MDP driver controls 8 devices in the device
> tree on its own. When running tests for the hardware video decoder, we
> found that the iommus and LARBs were not being properly configured. To
> configure them, a driver for each be added to mtk_mdp_comp so that
> mtk_iommu_add_device() can (eventually) be called from dma_configure()
> inside really_probe().
> 
> (2) The integration into the component framework allows us to defer the
> registration with the v4l2 subsystem until all the MDP-related devices
> have been probed, so that the relevant device node does not become
> available until initialization of all the components is complete.
> 
> Some notes about how the component framework has been integrated:
> 
> - The driver for the rdma0 component serves double duty as the "master"
>   (aggregate) driver as well as a component driver. This is a non-ideal
>   compromise until a better solution is developed. This device is
>   differentiated from the rest by checking for a "mediatek,vpu" property
>   in the device node.
> 
> - The list of mdp components remains hard-coded as mtk_mdp_comp_dt_ids[]
>   in mtk_mdp_core.c, and as mtk_mdp_comp_driver_dt_match[] in
>   mtk_mdp_comp.c. This unfortunate duplication of information is
>   addressed in a following patch in this series.
> 
> - The component driver calls component_add() for each device that is
>   probed.
> 
> - In mtk_mdp_probe (the "master" device), we scan the device tree for
>   any matching nodes against mtk_mdp_comp_dt_ids, and add component
>   matches for them. The match criteria is a matching device node
>   pointer.
> 
> - When the set of components devices that have been probed corresponds
>   with the list that is generated by the "master", the callback to
>   mtk_mdp_master_bind() is made, which then calls the component bind
>   functions.
> 
> - Inside mtk_mdp_master_bind(), once all the component bind functions
>   have been called, we can then register our device to the v4l2
>   subsystem.
> 
> - The call to pm_runtime_enable() in the master device is called after
>   all the components have been registered by their bind() functions
>   called by mtk_mtp_master_bind(). As a result, the list of components
>   will not change while power management callbacks mtk_mdp_suspend()/
>   resume() are accessing the list of components.
> 
> Signed-off-by: Eizan Miyamoto <eizan@chromium.org>
> ---
> 
> (no changes since v1)
> 
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 156 +++++++++++++---
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  25 +--
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 175 +++++++++++++-----
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.h |   1 +
>  4 files changed, 262 insertions(+), 95 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> index b3426a551bea..aec1cb5c4261 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> @@ -5,14 +5,52 @@
>   */
>  
>  #include <linux/clk.h>
> +#include <linux/component.h>
>  #include <linux/device.h>
> -#include <linux/of.h>

You're removing the include ... [1]

> +#include <linux/module.h>
>  #include <linux/of_address.h>
> +#include <linux/of_device.h>

I think this include is not needed, please remove it.

> +#include <linux/of.h>

[1] and adding here again, this change is not needed.

> +#include <linux/of_irq.h>

I think this include is not needed, please remove it.

>  #include <linux/of_platform.h>
>  #include <soc/mediatek/smi.h>
>  
>  #include "mtk_mdp_comp.h"
> -
> +#include "mtk_mdp_core.h"
> +
> +/**
> + * enum mtk_mdp_comp_type - the MDP component
> + * @MTK_MDP_RDMA:		Read DMA
> + * @MTK_MDP_RSZ:		Reszer
> + * @MTK_MDP_WDMA:		Write DMA
> + * @MTK_MDP_WROT:		Write DMA with rotation
> + * @MTK_MDP_COMP_TYPE_MAX:	Placeholder for num elems in this enum
> + */
> +enum mtk_mdp_comp_type {
> +	MTK_MDP_RDMA,
> +	MTK_MDP_RSZ,
> +	MTK_MDP_WDMA,
> +	MTK_MDP_WROT,
> +	MTK_MDP_COMP_TYPE_MAX,

This is not used anywhere, so you can remove it. Introduce it when you need (if
is needed).

> +};
> +
> +static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
> +	{
> +		.compatible = "mediatek,mt8173-mdp-rdma",
> +		.data = (void *)MTK_MDP_RDMA
> +	}, {
> +		.compatible = "mediatek,mt8173-mdp-rsz",
> +		.data = (void *)MTK_MDP_RSZ
> +	}, {
> +		.compatible = "mediatek,mt8173-mdp-wdma",
> +		.data = (void *)MTK_MDP_WDMA
> +	}, {
> +		.compatible = "mediatek,mt8173-mdp-wrot",
> +		.data = (void *)MTK_MDP_WROT
> +	},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
>  
>  void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
>  {
> @@ -21,9 +59,8 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
>  	if (comp->larb_dev) {
>  		err = mtk_smi_larb_get(comp->larb_dev);
>  		if (err)
> -			dev_err(dev,
> -				"failed to get larb, err %d. type:%d\n",
> -				err, comp->type);
> +			dev_err(comp->dev,
> +				"failed to get larb, err %d.\n", err);

I think that if you apply this patch alone it will fail to build. AFAICS there
is no member named 'dev' in 'struct mtk_mdp_comp'.

nit: Now that the limit is 100 chars, this can be in one line.

>  	}
>  
>  	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
> @@ -32,8 +69,8 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
>  		err = clk_prepare_enable(comp->clk[i]);
>  		if (err)
>  			dev_err(dev,
> -			"failed to enable clock, err %d. type:%d i:%d\n",
> -				err, comp->type, i);
> +				"failed to enable clock, err %d. i:%d\n",
> +				err, i);

nit: Now that the limit is 100 chars, this can be in one line.

>  	}
>  }
>  
> @@ -51,17 +88,42 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
>  		mtk_smi_larb_put(comp->larb_dev);
>  }
>  
> -int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
> -		      struct mtk_mdp_comp *comp,
> -		      enum mtk_mdp_comp_type comp_type)
> +static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
> +			void *data)

nit: Now that the limit is 100 chars, this can be in one line.

> +{
> +	struct mtk_mdp_comp *comp = dev_get_drvdata(dev);
> +	struct mtk_mdp_dev *mdp = data;
> +
> +	mtk_mdp_register_component(mdp, comp);
> +
> +	return 0;
> +}
> +
> +static void mtk_mdp_comp_unbind(struct device *dev, struct device *master,
> +			   void *data)
> +{
> +	struct mtk_mdp_dev *mdp = data;
> +	struct mtk_mdp_comp *comp = dev_get_drvdata(dev);

nit: reverse x-tree order, like you did just before. First comp, and then mdp.

> +
> +	mtk_mdp_unregister_component(mdp, comp);
> +}
> +
> +static const struct component_ops mtk_mdp_component_ops = {
> +	.bind   = mtk_mdp_comp_bind,
> +	.unbind = mtk_mdp_comp_unbind,
> +};
> +
> +int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev)
>  {
>  	struct device_node *larb_node;
>  	struct platform_device *larb_pdev;
>  	int ret;
>  	int i;
> +	struct device_node *node = dev->of_node;
> +	enum mtk_mdp_comp_type comp_type =
> +		 (enum mtk_mdp_comp_type)of_device_get_match_data(dev);

nit: Now that the limit is 100 chars, this can be in one line. Also maybe apply
the reverse x-tree rule for the new variables?

>  
> -	comp->dev_node = of_node_get(node);
> -	comp->type = comp_type;
> +	INIT_LIST_HEAD(&comp->node);
>  
>  	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
>  		comp->clk[i] = of_clk_get(node, i);
> @@ -69,19 +131,19 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
>  			if (PTR_ERR(comp->clk[i]) != -EPROBE_DEFER)
>  				dev_err(dev, "Failed to get clock\n");
>  			ret = PTR_ERR(comp->clk[i]);
> -			goto put_dev;
> +			goto err;
>  		}
>  
>  		/* Only RDMA needs two clocks */
> -		if (comp->type != MTK_MDP_RDMA)
> +		if (comp_type != MTK_MDP_RDMA)
>  			break;
>  	}
>  
>  	/* Only DMA capable components need the LARB property */
>  	comp->larb_dev = NULL;
> -	if (comp->type != MTK_MDP_RDMA &&
> -	    comp->type != MTK_MDP_WDMA &&
> -	    comp->type != MTK_MDP_WROT)
> +	if (comp_type != MTK_MDP_RDMA &&
> +	    comp_type != MTK_MDP_WDMA &&
> +	    comp_type != MTK_MDP_WROT)

nit: Now that the limit is 100 chars, this can be in one line.

>  		return 0;
>  
>  	larb_node = of_parse_phandle(node, "mediatek,larb", 0);
> @@ -89,7 +151,7 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
>  		dev_err(dev,
>  			"Missing mediadek,larb phandle in %pOF node\n", node);
>  		ret = -EINVAL;
> -		goto put_dev;
> +		goto err;
>  	}
>  
>  	larb_pdev = of_find_device_by_node(larb_node);
> @@ -97,7 +159,7 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
>  		dev_warn(dev, "Waiting for larb device %pOF\n", larb_node);
>  		of_node_put(larb_node);
>  		ret = -EPROBE_DEFER;
> -		goto put_dev;
> +		goto err;
>  	}
>  	of_node_put(larb_node);
>  
> @@ -105,13 +167,59 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
>  
>  	return 0;
>  
> -put_dev:
> -	of_node_put(comp->dev_node);
> -
> +err:
>  	return ret;
>  }
>  
> -void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp)
> +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;

nit: reverse x-tree order.

> +
> +	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;

For me this is confusing, so you're returning and error but what really want is
just ignore it. On the sub-system I maintain I'd prefer to reduce the dev_info
to dev_dbg and just return 0 here, as is not and error. But I think this code is
removed later, so not sure how important is to change that.


> +	}
> +
> +	comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
> +	if (!comp)
> +		return -ENOMEM;
> +
> +	status = mtk_mdp_comp_init(comp, dev);
> +	if (status) {
> +		dev_err(dev, "Failed to initialize component: %d\n", status);
> +		return status;
> +	}
> +
> +	dev_set_drvdata(dev, comp);
> +
> +	return component_add(dev, &mtk_mdp_component_ops);
> +}
> +
> +static int mtk_mdp_comp_remove(struct platform_device *pdev)
>  {
> -	of_node_put(comp->dev_node);
> +	struct device *dev = &pdev->dev;
> +
> +	component_del(dev, &mtk_mdp_component_ops);
> +	return 0;
>  }
> +
> +struct platform_driver mtk_mdp_component_driver = {
> +	.probe          = mtk_mdp_comp_probe,
> +	.remove         = mtk_mdp_comp_remove,
> +	.driver         = {
> +		.name   = "mediatek-mdp-comp",
> +		.owner  = THIS_MODULE,
> +		.of_match_table = mtk_mdp_comp_driver_dt_match,
> +	},
> +};
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> index 7897766c96bb..b5a18fe567aa 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> @@ -7,42 +7,23 @@
>  #ifndef __MTK_MDP_COMP_H__
>  #define __MTK_MDP_COMP_H__
>  
> -/**
> - * enum mtk_mdp_comp_type - the MDP component
> - * @MTK_MDP_RDMA:	Read DMA
> - * @MTK_MDP_RSZ:	Riszer
> - * @MTK_MDP_WDMA:	Write DMA
> - * @MTK_MDP_WROT:	Write DMA with rotation
> - */
> -enum mtk_mdp_comp_type {
> -	MTK_MDP_RDMA,
> -	MTK_MDP_RSZ,
> -	MTK_MDP_WDMA,
> -	MTK_MDP_WROT,
> -};
> -
>  /**
>   * struct mtk_mdp_comp - the MDP's function component data
>   * @node:	list node to track sibing MDP components
> - * @dev_node:	component device node
>   * @clk:	clocks required for component
>   * @larb_dev:	SMI device required for component
> - * @type:	component type
>   */
>  struct mtk_mdp_comp {
>  	struct list_head	node;
> -	struct device_node	*dev_node;
>  	struct clk		*clk[2];
>  	struct device		*larb_dev;
> -	enum mtk_mdp_comp_type	type;
>  };
>  
> -int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
> -		      struct mtk_mdp_comp *comp,
> -		      enum mtk_mdp_comp_type comp_type);
> -void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp);
> +int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
> +
>  void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp);
>  void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp);
>  
> +extern struct platform_driver mtk_mdp_component_driver;
>  
>  #endif /* __MTK_MDP_COMP_H__ */
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> index 976aa1f4829b..aca236dbd348 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -6,6 +6,7 @@
>   */
>  
>  #include <linux/clk.h>
> +#include <linux/component.h>
>  #include <linux/device.h>
>  #include <linux/errno.h>
>  #include <linux/interrupt.h>
> @@ -19,6 +20,7 @@
>  #include <linux/workqueue.h>
>  #include <soc/mediatek/smi.h>
>  
> +#include "mtk_mdp_comp.h"
>  #include "mtk_mdp_core.h"
>  #include "mtk_mdp_m2m.h"
>  #include "mtk_vpu.h"
> @@ -32,16 +34,12 @@ module_param(mtk_mdp_dbg_level, int, 0644);
>  static const struct of_device_id mtk_mdp_comp_dt_ids[] = {
>  	{
>  		.compatible = "mediatek,mt8173-mdp-rdma",
> -		.data = (void *)MTK_MDP_RDMA
>  	}, {
>  		.compatible = "mediatek,mt8173-mdp-rsz",
> -		.data = (void *)MTK_MDP_RSZ
>  	}, {
>  		.compatible = "mediatek,mt8173-mdp-wdma",
> -		.data = (void *)MTK_MDP_WDMA
>  	}, {
>  		.compatible = "mediatek,mt8173-mdp-wrot",
> -		.data = (void *)MTK_MDP_WROT
>  	},
>  	{ },
>  };
> @@ -91,6 +89,64 @@ static void mtk_mdp_reset_handler(void *priv)
>  	queue_work(mdp->wdt_wq, &mdp->wdt_work);
>  }
>  
> +static int compare_of(struct device *dev, void *data)
> +{
> +	return dev->of_node == data;
> +}
> +
> +static void release_of(struct device *dev, void *data)
> +{
> +	of_node_put(data);
> +}
> +
> +static int mtk_mdp_master_bind(struct device *dev)
> +{
> +	int status;
> +	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);

nit: reverse x-tree

> +
> +	mtk_mdp_register_component(mdp, &mdp->comp_self);
> +
> +	status = component_bind_all(dev, mdp);
> +	if (status) {
> +		dev_err(dev, "Failed to bind all components: %d\n", status);
> +		goto err_component_bind_all;
> +	}
> +
> +	status = mtk_mdp_register_m2m_device(mdp);
> +	if (status) {
> +		dev_err(dev, "Failed to register m2m device: %d\n", status);
> +		v4l2_err(&mdp->v4l2_dev, "Failed to init mem2mem device\n");

Duplicated error message, so remove one of them.

> +		goto err_mtk_mdp_register_m2m_device;
> +	}
> +
> +	pm_runtime_enable(dev);
> +
> +	return 0;
> +
> +err_mtk_mdp_register_m2m_device:
> +	component_unbind_all(dev, mdp);
> +
> +err_component_bind_all:
> +	mtk_mdp_unregister_component(mdp, &mdp->comp_self);
> +
> +	return status;
> +}
> +
> +static void mtk_mdp_master_unbind(struct device *dev)
> +{
> +	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
> +
> +	pm_runtime_disable(dev);
> +	mtk_mdp_unregister_m2m_device(mdp);
> +	component_unbind_all(dev, mdp);
> +	mtk_mdp_unregister_component(mdp, &mdp->comp_self);
> +}
> +
> +static const struct component_master_ops mtk_mdp_com_ops = {
> +	.bind		= mtk_mdp_master_bind,
> +	.unbind		= mtk_mdp_master_unbind,
> +};
> +
>  void mtk_mdp_register_component(struct mtk_mdp_dev *mdp,
>  				struct mtk_mdp_comp *comp)
>  {
> @@ -108,8 +164,8 @@ static int mtk_mdp_probe(struct platform_device *pdev)
>  	struct mtk_mdp_dev *mdp;
>  	struct device *dev = &pdev->dev;
>  	struct device_node *node, *parent;
> -	struct mtk_mdp_comp *comp, *comp_temp;
> -	int ret = 0;
> +	int i, ret = 0;
> +	struct component_match *match = NULL;
>  
>  	mdp = devm_kzalloc(dev, sizeof(*mdp), GFP_KERNEL);
>  	if (!mdp)
> @@ -134,36 +190,43 @@ static int mtk_mdp_probe(struct platform_device *pdev)
>  	}
>  
>  	/* Iterate over sibling MDP function blocks */
> +	i = 0;
>  	for_each_child_of_node(parent, node) {
> -		const struct of_device_id *of_id;
> -		enum mtk_mdp_comp_type comp_type;
> +		struct platform_device *pdev;
>  
> -		of_id = of_match_node(mtk_mdp_comp_dt_ids, node);
> -		if (!of_id)
> +		if (!of_match_node(mtk_mdp_comp_dt_ids, node))
>  			continue;
>  
> -		if (!of_device_is_available(node)) {
> -			dev_err(dev, "Skipping disabled component %pOF\n",
> -				node);
> +		if (!of_device_is_available(node))
>  			continue;
> -		}
>  
> -		comp_type = (enum mtk_mdp_comp_type)of_id->data;
> -
> -		comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
> -		if (!comp) {
> -			ret = -ENOMEM;
> -			of_node_put(node);
> -			goto err_comp;
> +		pdev = of_find_device_by_node(node);
> +		if (!pdev) {
> +			dev_warn(dev, "Unable to find comp device %s\n",
> +				 node->full_name);

nit: Now that the limit is 100 chars, this can be in one line.

> +			continue;
>  		}
>  
> -		ret = mtk_mdp_comp_init(dev, node, comp, comp_type);
> -		if (ret) {
> -			of_node_put(node);
> -			goto err_comp;
> +		/*
> +		 * Do not add a match for my own (rdma0) device node.
> +		 * I will be managing it directly instead using comp_self.
> +		 */
> +		if (&pdev->dev != dev) {
> +			dev_dbg(dev, "adding match %d for: %pOF\n", i++, node);
> +			component_match_add_release(dev, &match, release_of,
> +						    compare_of,
> +						    of_node_get(node));
>  		}
> +	}
>  
> -		mtk_mdp_register_component(mdp, comp);
> +	/*
> +	 * 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);
> @@ -188,18 +251,12 @@ static int mtk_mdp_probe(struct platform_device *pdev)
>  		goto err_dev_register;
>  	}
>  
> -	ret = mtk_mdp_register_m2m_device(mdp);
> -	if (ret) {
> -		v4l2_err(&mdp->v4l2_dev, "Failed to init mem2mem device\n");
> -		goto err_m2m_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_m2m_register;
> +		goto err_wdt_reg;
>  	}
>  
>  	platform_set_drvdata(pdev, mdp);
> @@ -207,15 +264,25 @@ static int mtk_mdp_probe(struct platform_device *pdev)
>  	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_m2m_register;
> +		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");
> +		goto err_component_master_add;
>  	}
>  
> -	pm_runtime_enable(dev);
>  	dev_dbg(dev, "mdp-%d registered successfully\n", mdp->id);
>  
>  	return 0;
>  
> -err_m2m_register:
> +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:
> @@ -227,11 +294,6 @@ static int mtk_mdp_probe(struct platform_device *pdev)
>  err_alloc_job_wq:
>  
>  err_comp:
> -	list_for_each_entry_safe(comp, comp_temp, &mdp->comp_list, node) {
> -		mtk_mdp_unregister_component(mdp, comp);
> -		mtk_mdp_comp_deinit(dev, comp);
> -	}
> -
>  	dev_dbg(dev, "err %d\n", ret);
>  	return ret;
>  }
> @@ -239,11 +301,10 @@ static int mtk_mdp_probe(struct platform_device *pdev)
>  static int mtk_mdp_remove(struct platform_device *pdev)
>  {
>  	struct mtk_mdp_dev *mdp = platform_get_drvdata(pdev);
> -	struct mtk_mdp_comp *comp, *comp_temp;
>  
> -	pm_runtime_disable(&pdev->dev);
> +	component_master_del(&pdev->dev, &mtk_mdp_com_ops);
> +
>  	vb2_dma_contig_clear_max_seg_size(&pdev->dev);
> -	mtk_mdp_unregister_m2m_device(mdp);
>  	v4l2_device_unregister(&mdp->v4l2_dev);
>  
>  	flush_workqueue(mdp->wdt_wq);
> @@ -252,10 +313,8 @@ static int mtk_mdp_remove(struct platform_device *pdev)
>  	flush_workqueue(mdp->job_wq);
>  	destroy_workqueue(mdp->job_wq);
>  
> -	list_for_each_entry_safe(comp, comp_temp, &mdp->comp_list, node) {
> -		mtk_mdp_unregister_component(mdp, comp);
> -		mtk_mdp_comp_deinit(&pdev->dev, comp);
> -	}
> +	if (!list_empty(&mdp->comp_list))
> +		dev_err(&pdev->dev, "not all components removed\n");

I'm not sure about media, but in most subsystems is not allowed to print and
error and do not return an error. So you should return and error here. Maybe
setup a warning as this is unlikely to happen?

>  
>  	dev_dbg(&pdev->dev, "%s driver unloaded\n", pdev->name);
>  	return 0;
> @@ -310,7 +369,25 @@ static struct platform_driver mtk_mdp_driver = {
>  	}
>  };
>  
> -module_platform_driver(mtk_mdp_driver);
> +static struct platform_driver * const mtk_mdp_drivers[] = {
> +	&mtk_mdp_driver,
> +	&mtk_mdp_component_driver,
> +};
> +
> +static int __init mtk_mdp_init(void)
> +{
> +	return platform_register_drivers(mtk_mdp_drivers,
> +					 ARRAY_SIZE(mtk_mdp_drivers));
> +}
> +
> +static void __exit mtk_mdp_exit(void)
> +{
> +	platform_unregister_drivers(mtk_mdp_drivers,
> +				    ARRAY_SIZE(mtk_mdp_drivers));
> +}
> +
> +module_init(mtk_mdp_init);
> +module_exit(mtk_mdp_exit);
>  
>  MODULE_AUTHOR("Houlong Wei <houlong.wei@mediatek.com>");
>  MODULE_DESCRIPTION("Mediatek image processor driver");

I know this is not related to this patch, but is this driver really a "Mediatek
Image Processor driver"? When I read this I understand it is a ISP.

> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.h b/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
> index a6e6dc36307b..8a52539b15d4 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
> @@ -155,6 +155,7 @@ struct mtk_mdp_dev {
>  	struct mtk_mdp_variant		*variant;
>  	u16				id;
>  	struct list_head		comp_list;
> +	struct mtk_mdp_comp		comp_self;
>  	struct v4l2_m2m_dev		*m2m_dev;
>  	struct list_head		ctx_list;
>  	struct video_device		*vdev;
> 

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[PATCH v5 2/8] mtk-mdp: use pm_runtime in MDP component driver

[Eizan Miyamoto]

Without this change, the MDP components are not fully integrated into
the runtime power management subsystem, and the MDP driver does not
work.

For each of the component device drivers to be able to call
pm_runtime_get/put_sync() a pointer to the component's device struct
had to be added to struct mtk_mdp_comp, set by mtk_mdp_comp_init().

Note that the dev argument to mtk_mdp_comp_clock_on/off() has been
removed. Those functions used to be called from the "master" mdp driver
in mtk_mdp_core.c, but the component's device pointer no longer
corresponds to the mdp master device pointer, which is not the right
device to pass to pm_runtime_put/get_sync() which we had to add to get
the driver to work properly.

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

(no changes since v1)

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 20 ++++++++++++++-----
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  8 +++++---
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c |  6 ++----
 3 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index aec1cb5c4261..8b6158379f41 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -14,6 +14,7 @@
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <soc/mediatek/smi.h>
+#include <linux/pm_runtime.h>
 
 #include "mtk_mdp_comp.h"
 #include "mtk_mdp_core.h"
@@ -52,7 +53,7 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
 };
 MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
 
-void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
+void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
 {
 	int i, err;
 
@@ -63,18 +64,22 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
 				"failed to get larb, err %d.\n", err);
 	}
 
+	err = pm_runtime_get_sync(comp->dev);
+	if (err < 0)
+		dev_err(comp->dev,
+			"failed to runtime get, err %d.\n",
+			err);
+
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 		if (IS_ERR(comp->clk[i]))
 			continue;
 		err = clk_prepare_enable(comp->clk[i]);
 		if (err)
-			dev_err(dev,
-				"failed to enable clock, err %d. i:%d\n",
-				err, i);
+			dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i);
 	}
 }
 
-void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
+void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
 {
 	int i;
 
@@ -86,6 +91,8 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
 
 	if (comp->larb_dev)
 		mtk_smi_larb_put(comp->larb_dev);
+
+	pm_runtime_put_sync(comp->dev);
 }
 
 static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
@@ -95,6 +102,7 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
 	struct mtk_mdp_dev *mdp = data;
 
 	mtk_mdp_register_component(mdp, comp);
+	pm_runtime_enable(dev);
 
 	return 0;
 }
@@ -105,6 +113,7 @@ static void mtk_mdp_comp_unbind(struct device *dev, struct device *master,
 	struct mtk_mdp_dev *mdp = data;
 	struct mtk_mdp_comp *comp = dev_get_drvdata(dev);
 
+	pm_runtime_disable(dev);
 	mtk_mdp_unregister_component(mdp, comp);
 }
 
@@ -124,6 +133,7 @@ int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev)
 		 (enum mtk_mdp_comp_type)of_device_get_match_data(dev);
 
 	INIT_LIST_HEAD(&comp->node);
+	comp->dev = dev;
 
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 		comp->clk[i] = of_clk_get(node, i);
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
index b5a18fe567aa..5e2ee94a1b37 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
@@ -12,17 +12,19 @@
  * @node:	list node to track sibing MDP components
  * @clk:	clocks required for component
  * @larb_dev:	SMI device required for component
+ * @dev:	component's device
  */
 struct mtk_mdp_comp {
 	struct list_head	node;
 	struct clk		*clk[2];
-	struct device		*larb_dev;
+	struct device           *larb_dev;
+	struct device		*dev;
 };
 
 int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
 
-void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp);
-void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp);
+void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
+void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp);
 
 extern struct platform_driver mtk_mdp_component_driver;
 
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index aca236dbd348..78c40a61df1d 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -52,20 +52,18 @@ MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids);
 
 static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
 {
-	struct device *dev = &mdp->pdev->dev;
 	struct mtk_mdp_comp *comp_node;
 
 	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_clock_on(dev, comp_node);
+		mtk_mdp_comp_clock_on(comp_node);
 }
 
 static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
 {
-	struct device *dev = &mdp->pdev->dev;
 	struct mtk_mdp_comp *comp_node;
 
 	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_clock_off(dev, comp_node);
+		mtk_mdp_comp_clock_off(comp_node);
 }
 
 static void mtk_mdp_wdt_worker(struct work_struct *work)
-- 
2.32.0.93.g670b81a890-goog


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Re: [PATCH v5 2/8] mtk-mdp: use pm_runtime in MDP component driver

[Enric Balletbo i Serra]

Hi Eizan,

Thank you for your patch.

On 9/7/21 4:23, Eizan Miyamoto wrote:
> Without this change, the MDP components are not fully integrated into
> the runtime power management subsystem, and the MDP driver does not
> work.
> 
> For each of the component device drivers to be able to call
> pm_runtime_get/put_sync() a pointer to the component's device struct
> had to be added to struct mtk_mdp_comp, set by mtk_mdp_comp_init().
> 
> Note that the dev argument to mtk_mdp_comp_clock_on/off() has been
> removed. Those functions used to be called from the "master" mdp driver
> in mtk_mdp_core.c, but the component's device pointer no longer
> corresponds to the mdp master device pointer, which is not the right
> device to pass to pm_runtime_put/get_sync() which we had to add to get
> the driver to work properly.
> 
> Signed-off-by: Eizan Miyamoto <eizan@chromium.org>
> ---
> 
> (no changes since v1)
> 
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 20 ++++++++++++++-----
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  8 +++++---
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.c |  6 ++----
>  3 files changed, 22 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> index aec1cb5c4261..8b6158379f41 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> @@ -14,6 +14,7 @@
>  #include <linux/of_irq.h>
>  #include <linux/of_platform.h>
>  #include <soc/mediatek/smi.h>
> +#include <linux/pm_runtime.h>
>  
>  #include "mtk_mdp_comp.h"
>  #include "mtk_mdp_core.h"
> @@ -52,7 +53,7 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
>  
> -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
> +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
>  {
>  	int i, err;
>  
> @@ -63,18 +64,22 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
>  				"failed to get larb, err %d.\n", err);
>  	}
>  
> +	err = pm_runtime_get_sync(comp->dev);
> +	if (err < 0)

The pm_runtime_get_sync increases the device usage counter so, if it fails you
should decrease the usage with put.

Ok I see that put is called in off. I don't really like how the error handling
of all this is done, but also I think is not your problem, it was also a problem
before this patch.

> +		dev_err(comp->dev,
> +			"failed to runtime get, err %d.\n",
> +			err);
> +

Printing errors and not returning errors is bad design for me. But this is a
void function, so ...

>  	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
>  		if (IS_ERR(comp->clk[i]))
>  			continue;
>  		err = clk_prepare_enable(comp->clk[i]);
>  		if (err)
> -			dev_err(dev,
> -				"failed to enable clock, err %d. i:%d\n",
> -				err, i);
> +			dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i);


I think that if clock fails to be enabled it will already print an error, so
this print is duplicated.

>  	}
>  }
>  
> -void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
> +void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
>  {
>  	int i;
>  
> @@ -86,6 +91,8 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
>  
>  	if (comp->larb_dev)
>  		mtk_smi_larb_put(comp->larb_dev);
> +
> +	pm_runtime_put_sync(comp->dev);
>  }
>  
>  static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
> @@ -95,6 +102,7 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
>  	struct mtk_mdp_dev *mdp = data;
>  
>  	mtk_mdp_register_component(mdp, comp);
> +	pm_runtime_enable(dev);
>  
>  	return 0;
>  }
> @@ -105,6 +113,7 @@ static void mtk_mdp_comp_unbind(struct device *dev, struct device *master,
>  	struct mtk_mdp_dev *mdp = data;
>  	struct mtk_mdp_comp *comp = dev_get_drvdata(dev);
>  
> +	pm_runtime_disable(dev);
>  	mtk_mdp_unregister_component(mdp, comp);
>  }
>  
> @@ -124,6 +133,7 @@ int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev)
>  		 (enum mtk_mdp_comp_type)of_device_get_match_data(dev);
>  
>  	INIT_LIST_HEAD(&comp->node);
> +	comp->dev = dev;
>  
>  	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
>  		comp->clk[i] = of_clk_get(node, i);
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> index b5a18fe567aa..5e2ee94a1b37 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> @@ -12,17 +12,19 @@
>   * @node:	list node to track sibing MDP components
>   * @clk:	clocks required for component
>   * @larb_dev:	SMI device required for component
> + * @dev:	component's device
>   */
>  struct mtk_mdp_comp {
>  	struct list_head	node;
>  	struct clk		*clk[2];
> -	struct device		*larb_dev;
> +	struct device           *larb_dev;

This change is unrelated to this patch.

> +	struct device		*dev;
>  };
>  
>  int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
>  
> -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp);
> -void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp);
> +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
> +void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp);
>  
>  extern struct platform_driver mtk_mdp_component_driver;
>  
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> index aca236dbd348..78c40a61df1d 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -52,20 +52,18 @@ MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids);
>  
>  static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
>  {
> -	struct device *dev = &mdp->pdev->dev;
>  	struct mtk_mdp_comp *comp_node;
>  
>  	list_for_each_entry(comp_node, &mdp->comp_list, node)
> -		mtk_mdp_comp_clock_on(dev, comp_node);
> +		mtk_mdp_comp_clock_on(comp_node);
>  }
>  
>  static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
>  {
> -	struct device *dev = &mdp->pdev->dev;
>  	struct mtk_mdp_comp *comp_node;
>  
>  	list_for_each_entry(comp_node, &mdp->comp_list, node)
> -		mtk_mdp_comp_clock_off(dev, comp_node);
> +		mtk_mdp_comp_clock_off(comp_node);
>  }
>  
>  static void mtk_mdp_wdt_worker(struct work_struct *work)
> 

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[PATCH v5 3/8] media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on

[Eizan Miyamoto]

The original intent of commit 86698b9505bbc ("media: mtk-mdp: convert
mtk_mdp_dev.comp array to list") was to create a list to track all the
MDP components that needed to have their clocks enabled/disabled when
calling mtk_mdp_comp_clock_on/off. However, there was a bug inside
mtk_mdp_register_component where the args to a call to list_add were
swapped. The result is that only one component was added to
mtk_mdp_dev.comp_list because comp_list was instead being
repeatedly added to the single element lists headed by each
mtk_mdp_comp.

The order of the args to list_add in mtk_mdp_register_component was
fixed in https://patchwork.kernel.org/patch/11742895/ (Fix Null pointer
dereference when calling list_add).

Then, as a result of https://patchwork.kernel.org/patch/11530769/
(mtk-mdp: use pm_runtime in MDP component driver) if all the components
are added to the component list, the mdp "master" / rdma0 component
ends up having pm_runtime_get_sync() called on it twice recursively:

    rpm_resume+0x694/0x8f8
    __pm_runtime_resume+0x7c/0xa0 ***NOTE***
    mtk_mdp_comp_clock_on+0x48/0x104 [mtk_mdp]
    mtk_mdp_pm_resume+0x2c/0x44 [mtk_mdp]
    pm_generic_runtime_resume+0x34/0x48
    __genpd_runtime_resume+0x6c/0x80
    genpd_runtime_resume+0x104/0x1ac
    __rpm_callback+0x120/0x238
    rpm_callback+0x34/0x8c
    rpm_resume+0x7a0/0x8f8
    __pm_runtime_resume+0x7c/0xa0 ***NOTE***
    mtk_mdp_m2m_start_streaming+0x2c/0x3c [mtk_mdp]

(The calls to pm_runtime_get_sync are inlined and correspond to the
calls to __pm_runtime_resume). It is not correct to have
pm_runtime_get_sync called recursively and the second call will block
indefinitely.

As a result of all that, this change factors mtk_mdp_comp_clock_on/off
into mtk_mdp_comp_power_on/off and moves the calls to
pm_runtime_get/put into the power_on/off functions.

This change then special-cases the master/rdma0 MDP component and does
these things:
- the master/rdma0 component is not added to mtk_mdp_dev.comp_list
- the master/rdma0 component has its clocks (*but not power*) toggled
  by mtk_mpd_comp_clock_on/off inside mtk_mdp_clock_on/off.
- the other components have their clocks *and* power toggled with
  mtk_mdp_comp_power_on/off.

This change introduces the assumption that mtk_mdp_pm_resume will
always be called though a callback from pm_runtime_get_sync made on the
master / rdma0 component.

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

(no changes since v1)

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 28 ++++++++++++++-----
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  3 ++
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 23 ++++++++++-----
 3 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index 8b6158379f41..ce54863c24ce 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -53,9 +53,9 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
 };
 MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
 
-void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
+void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
 {
-	int i, err;
+	int err;
 
 	if (comp->larb_dev) {
 		err = mtk_smi_larb_get(comp->larb_dev);
@@ -66,9 +66,25 @@ void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
 
 	err = pm_runtime_get_sync(comp->dev);
 	if (err < 0)
-		dev_err(comp->dev,
-			"failed to runtime get, err %d.\n",
-			err);
+		dev_err(comp->dev, "failed to runtime get, err %d.\n", err);
+
+	mtk_mdp_comp_clock_on(comp);
+}
+
+void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp)
+{
+	int err;
+
+	mtk_mdp_comp_clock_off(comp);
+
+	err = pm_runtime_put_sync(comp->dev);
+	if (err < 0)
+		dev_err(comp->dev, "failed to runtime put, err %d.\n", err);
+}
+
+void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
+{
+	int i, err;
 
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 		if (IS_ERR(comp->clk[i]))
@@ -91,8 +107,6 @@ void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
 
 	if (comp->larb_dev)
 		mtk_smi_larb_put(comp->larb_dev);
-
-	pm_runtime_put_sync(comp->dev);
 }
 
 static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
index 5e2ee94a1b37..15ef9539a5a7 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
@@ -23,6 +23,9 @@ struct mtk_mdp_comp {
 
 int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
 
+void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp);
+void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp);
+
 void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
 void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp);
 
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index 78c40a61df1d..3558a6587f51 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -54,8 +54,15 @@ static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
 {
 	struct mtk_mdp_comp *comp_node;
 
+	/*
+	 * The master / rdma0 component will have pm_runtime_get_sync called
+	 * on it through mtk_mdp_m2m_start_streaming, making it unnecessary to
+	 * have mtk_mdp_comp_power_on called on it.
+	 */
+	mtk_mdp_comp_clock_on(&mdp->comp_self);
+
 	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_clock_on(comp_node);
+		mtk_mdp_comp_power_on(comp_node);
 }
 
 static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
@@ -63,7 +70,14 @@ static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
 	struct mtk_mdp_comp *comp_node;
 
 	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_clock_off(comp_node);
+		mtk_mdp_comp_power_off(comp_node);
+
+	/*
+	 * The master / rdma0 component will have pm_runtime_put called
+	 * on it through mtk_mdp_m2m_stop_streaming, making it unnecessary to
+	 * have mtk_mdp_comp_power_off called on it.
+	 */
+	mtk_mdp_comp_clock_off(&mdp->comp_self);
 }
 
 static void mtk_mdp_wdt_worker(struct work_struct *work)
@@ -102,8 +116,6 @@ static int mtk_mdp_master_bind(struct device *dev)
 	int status;
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
-	mtk_mdp_register_component(mdp, &mdp->comp_self);
-
 	status = component_bind_all(dev, mdp);
 	if (status) {
 		dev_err(dev, "Failed to bind all components: %d\n", status);
@@ -125,8 +137,6 @@ static int mtk_mdp_master_bind(struct device *dev)
 	component_unbind_all(dev, mdp);
 
 err_component_bind_all:
-	mtk_mdp_unregister_component(mdp, &mdp->comp_self);
-
 	return status;
 }
 
@@ -137,7 +147,6 @@ static void mtk_mdp_master_unbind(struct device *dev)
 	pm_runtime_disable(dev);
 	mtk_mdp_unregister_m2m_device(mdp);
 	component_unbind_all(dev, mdp);
-	mtk_mdp_unregister_component(mdp, &mdp->comp_self);
 }
 
 static const struct component_master_ops mtk_mdp_com_ops = {
-- 
2.32.0.93.g670b81a890-goog


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Re: [PATCH v5 3/8] media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on

[Enric Balletbo i Serra]

Hi Eizan,

Thank you for your patch.

On 9/7/21 4:23, Eizan Miyamoto wrote:
> The original intent of commit 86698b9505bbc ("media: mtk-mdp: convert
> mtk_mdp_dev.comp array to list") was to create a list to track all the
> MDP components that needed to have their clocks enabled/disabled when
> calling mtk_mdp_comp_clock_on/off. However, there was a bug inside
> mtk_mdp_register_component where the args to a call to list_add were
> swapped. The result is that only one component was added to
> mtk_mdp_dev.comp_list because comp_list was instead being
> repeatedly added to the single element lists headed by each
> mtk_mdp_comp.
> 
> The order of the args to list_add in mtk_mdp_register_component was
> fixed in https://patchwork.kernel.org/patch/11742895/ (Fix Null pointer
> dereference when calling list_add).
> 
> Then, as a result of https://patchwork.kernel.org/patch/11530769/
> (mtk-mdp: use pm_runtime in MDP component driver) if all the components
> are added to the component list, the mdp "master" / rdma0 component
> ends up having pm_runtime_get_sync() called on it twice recursively:
> 
>     rpm_resume+0x694/0x8f8
>     __pm_runtime_resume+0x7c/0xa0 ***NOTE***
>     mtk_mdp_comp_clock_on+0x48/0x104 [mtk_mdp]
>     mtk_mdp_pm_resume+0x2c/0x44 [mtk_mdp]
>     pm_generic_runtime_resume+0x34/0x48
>     __genpd_runtime_resume+0x6c/0x80
>     genpd_runtime_resume+0x104/0x1ac
>     __rpm_callback+0x120/0x238
>     rpm_callback+0x34/0x8c
>     rpm_resume+0x7a0/0x8f8
>     __pm_runtime_resume+0x7c/0xa0 ***NOTE***
>     mtk_mdp_m2m_start_streaming+0x2c/0x3c [mtk_mdp]
> 
> (The calls to pm_runtime_get_sync are inlined and correspond to the
> calls to __pm_runtime_resume). It is not correct to have
> pm_runtime_get_sync called recursively and the second call will block
> indefinitely.
> 
> As a result of all that, this change factors mtk_mdp_comp_clock_on/off
> into mtk_mdp_comp_power_on/off and moves the calls to
> pm_runtime_get/put into the power_on/off functions.
> 
> This change then special-cases the master/rdma0 MDP component and does
> these things:
> - the master/rdma0 component is not added to mtk_mdp_dev.comp_list
> - the master/rdma0 component has its clocks (*but not power*) toggled
>   by mtk_mpd_comp_clock_on/off inside mtk_mdp_clock_on/off.
> - the other components have their clocks *and* power toggled with
>   mtk_mdp_comp_power_on/off.
> 
> This change introduces the assumption that mtk_mdp_pm_resume will
> always be called though a callback from pm_runtime_get_sync made on the
> master / rdma0 component.
> 
> Signed-off-by: Eizan Miyamoto <eizan@chromium.org>
> ---
> 
> (no changes since v1)
> 
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 28 ++++++++++++++-----
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  3 ++
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 23 ++++++++++-----
>  3 files changed, 40 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> index 8b6158379f41..ce54863c24ce 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> @@ -53,9 +53,9 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
>  
> -void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
> +void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
>  {
> -	int i, err;
> +	int err;
>  
>  	if (comp->larb_dev) {
>  		err = mtk_smi_larb_get(comp->larb_dev);
> @@ -66,9 +66,25 @@ void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
>  
>  	err = pm_runtime_get_sync(comp->dev);
>  	if (err < 0)
> -		dev_err(comp->dev,
> -			"failed to runtime get, err %d.\n",
> -			err);
> +		dev_err(comp->dev, "failed to runtime get, err %d.\n", err);

You can do that change in the previous patch which is the one that introduces
this dev_err call.

> +
> +	mtk_mdp_comp_clock_on(comp);
> +}
> +
> +void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp)
> +{
> +	int err;
> +
> +	mtk_mdp_comp_clock_off(comp);
> +
> +	err = pm_runtime_put_sync(comp->dev);
> +	if (err < 0)
> +		dev_err(comp->dev, "failed to runtime put, err %d.\n", err);
> +}
> +
> +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
> +{
> +	int i, err;
>  
>  	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
>  		if (IS_ERR(comp->clk[i]))
> @@ -91,8 +107,6 @@ void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
>  
>  	if (comp->larb_dev)
>  		mtk_smi_larb_put(comp->larb_dev);
> -
> -	pm_runtime_put_sync(comp->dev);

Ok, now that you are changing these functions I think it will be good to rework
these clock_on and off properly. First returning an error when is needed and
handling it properly on the error path instead of ignoring.

>  }
>  
>  static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> index 5e2ee94a1b37..15ef9539a5a7 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> @@ -23,6 +23,9 @@ struct mtk_mdp_comp {
>  
>  int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
>  
> +void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp);
> +void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp);
> +
>  void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
>  void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp);
>  
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> index 78c40a61df1d..3558a6587f51 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -54,8 +54,15 @@ static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
>  {
>  	struct mtk_mdp_comp *comp_node;
>  
> +	/*
> +	 * The master / rdma0 component will have pm_runtime_get_sync called
> +	 * on it through mtk_mdp_m2m_start_streaming, making it unnecessary to
> +	 * have mtk_mdp_comp_power_on called on it.
> +	 */
> +	mtk_mdp_comp_clock_on(&mdp->comp_self);
> +
>  	list_for_each_entry(comp_node, &mdp->comp_list, node)
> -		mtk_mdp_comp_clock_on(comp_node);
> +		mtk_mdp_comp_power_on(comp_node);
>  }
>  
>  static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
> @@ -63,7 +70,14 @@ static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
>  	struct mtk_mdp_comp *comp_node;
>  
>  	list_for_each_entry(comp_node, &mdp->comp_list, node)
> -		mtk_mdp_comp_clock_off(comp_node);
> +		mtk_mdp_comp_power_off(comp_node);
> +
> +	/*
> +	 * The master / rdma0 component will have pm_runtime_put called
> +	 * on it through mtk_mdp_m2m_stop_streaming, making it unnecessary to
> +	 * have mtk_mdp_comp_power_off called on it.
> +	 */
> +	mtk_mdp_comp_clock_off(&mdp->comp_self);
>  }
>  
>  static void mtk_mdp_wdt_worker(struct work_struct *work)
> @@ -102,8 +116,6 @@ static int mtk_mdp_master_bind(struct device *dev)
>  	int status;
>  	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
>  
> -	mtk_mdp_register_component(mdp, &mdp->comp_self);
> -
>  	status = component_bind_all(dev, mdp);
>  	if (status) {
>  		dev_err(dev, "Failed to bind all components: %d\n", status);
> @@ -125,8 +137,6 @@ static int mtk_mdp_master_bind(struct device *dev)
>  	component_unbind_all(dev, mdp);
>  
>  err_component_bind_all:
> -	mtk_mdp_unregister_component(mdp, &mdp->comp_self);
> -
>  	return status;
>  }
>  
> @@ -137,7 +147,6 @@ static void mtk_mdp_master_unbind(struct device *dev)
>  	pm_runtime_disable(dev);
>  	mtk_mdp_unregister_m2m_device(mdp);
>  	component_unbind_all(dev, mdp);
> -	mtk_mdp_unregister_component(mdp, &mdp->comp_self);
>  }
>  
>  static const struct component_master_ops mtk_mdp_com_ops = {
> 

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[PATCH v5 4/8] mtk-mdp: soc: mediatek: register mdp from mmsys

[Eizan Miyamoto]

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@chromium.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


_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

Re: [PATCH v5 4/8] mtk-mdp: soc: mediatek: register mdp from mmsys

[Enric Balletbo i Serra]

Hi Eizan,

Thank you for your patch.

On 9/7/21 4:23, Eizan Miyamoto wrote:
> 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:

This is touching two systems, media and soc.In order to upstream better and
facilitate the sync between maintainers I'd do a patch for every thing, so it's
clear when is needed to touch both systems.

> - 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@chromium.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[] = {
> 

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[PATCH v5 5/8] media: mtk-mdp: search for vpu node instead of linking it to a property

[Eizan Miyamoto]

Since there is only one vpu node, it suffices to search for it instead
of having a link coded into the primary mdp device node.

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

(no changes since v1)

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c |  6 ----
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 28 +++++++++++++------
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index 0ee6c7d65664..8a9267d0da1e 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -127,12 +127,6 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
 	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");
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index 9af3dc0e204a..74ef37eb50bd 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -114,6 +114,7 @@ static void release_of(struct device *dev, void *data)
 static int mtk_mdp_master_bind(struct device *dev)
 {
 	int status;
+	struct device_node *vpu_node;
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
 	status = component_bind_all(dev, mdp);
@@ -122,15 +123,24 @@ 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");
+	vpu_node = of_find_node_by_name(NULL, "vpu");
+	if (!vpu_node) {
+		dev_err(dev, "unable to find vpu node");
+		status = -ENODEV;
+		goto err_wdt_reg;
+	}
+
+	mdp->vpu_dev = of_find_device_by_node(vpu_node);
+	if (!mdp->vpu_dev) {
+		dev_err(dev, "unable to find vpu device");
+		status = -ENODEV;
+		goto err_wdt_reg;
+	}
+
+	status = vpu_wdt_reg_handler(mdp->vpu_dev, mtk_mdp_reset_handler, mdp, VPU_RST_MDP);
+	if (status) {
+		dev_err(dev, "Failed to register reset handler\n");
+		goto err_wdt_reg;
 	}
 
 	status = mtk_mdp_register_m2m_device(mdp);
-- 
2.32.0.93.g670b81a890-goog


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[PATCH v5 6/8] media: mtk-mdp: propagate errors better in pm_suspend/resume

[Eizan Miyamoto]

Up until this change, many errors were logged but ignored when powering
on clocks and calling pm_runtime_get/put() inside mtk_mdp_core. This
change tries to do a better job at propagating errors back to the power
management framework.

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

(no changes since v1)

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 62 ++++++++++++++++---
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  6 +-
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 57 +++++++++++++----
 3 files changed, 99 insertions(+), 26 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index 8a9267d0da1e..87e3f72ff02b 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -53,9 +53,9 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
 };
 MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
 
-void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
+int mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
 {
-	int err;
+	int status, err;
 
 	if (comp->larb_dev) {
 		err = mtk_smi_larb_get(comp->larb_dev);
@@ -65,34 +65,76 @@ void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
 	}
 
 	err = pm_runtime_get_sync(comp->dev);
-	if (err < 0)
+	if (err < 0) {
 		dev_err(comp->dev, "failed to runtime get, err %d.\n", err);
+		return err;
+	}
+
+	err = mtk_mdp_comp_clock_on(comp);
+	if (err) {
+		dev_err(comp->dev, "failed to turn on clock. err=%d", err);
+		status = err;
+		goto err_mtk_mdp_comp_clock_on;
+	}
+
+	return err;
+
+err_mtk_mdp_comp_clock_on:
+	err = pm_runtime_put_sync(comp->dev);
+	if (err)
+		dev_err(comp->dev, "failed to runtime put in cleanup. err=%d", err);
 
-	mtk_mdp_comp_clock_on(comp);
+	return status;
 }
 
-void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp)
+int mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp)
 {
-	int err;
+	int status, err;
 
 	mtk_mdp_comp_clock_off(comp);
 
 	err = pm_runtime_put_sync(comp->dev);
-	if (err < 0)
+	if (err < 0) {
 		dev_err(comp->dev, "failed to runtime put, err %d.\n", err);
+		status = err;
+		goto err_pm_runtime_put_sync;
+	}
+
+	return 0;
+
+err_pm_runtime_put_sync:
+	err = mtk_mdp_comp_clock_on(comp);
+	if (err)
+		dev_err(comp->dev, "failed to turn on clock in cleanup. err=%d", err);
+
+	return status;
 }
 
-void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
+int mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
 {
-	int i, err;
+	int i, err, status;
 
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 		if (IS_ERR(comp->clk[i]))
 			continue;
 		err = clk_prepare_enable(comp->clk[i]);
-		if (err)
+		if (err) {
+			status = err;
 			dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i);
+			goto err_clk_prepare_enable;
+		}
+	}
+
+	return 0;
+
+err_clk_prepare_enable:
+	for (--i; i >= 0; i--) {
+		if (IS_ERR(comp->clk[i]))
+			continue;
+		clk_disable_unprepare(comp->clk[i]);
 	}
+
+	return status;
 }
 
 void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
index 15ef9539a5a7..5201c47f7baa 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
@@ -23,10 +23,10 @@ struct mtk_mdp_comp {
 
 int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
 
-void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp);
-void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp);
+int mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp);
+int mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp);
 
-void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
+int mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
 void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp);
 
 extern struct platform_driver mtk_mdp_component_driver;
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index 74ef37eb50bd..b45d588d2659 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -50,8 +50,9 @@ static const struct of_device_id mtk_mdp_of_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids);
 
-static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
+static int mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
 {
+	int err, status;
 	struct mtk_mdp_comp *comp_node;
 
 	/*
@@ -59,18 +60,41 @@ static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
 	 * on it through mtk_mdp_m2m_start_streaming, making it unnecessary to
 	 * have mtk_mdp_comp_power_on called on it.
 	 */
-	mtk_mdp_comp_clock_on(&mdp->comp_self);
+	err = mtk_mdp_comp_clock_on(&mdp->comp_self);
+	if (err)
+		return err;
+
+	list_for_each_entry(comp_node, &mdp->comp_list, node) {
+		err = mtk_mdp_comp_power_on(comp_node);
+		if (err) {
+			status = err;
+			goto err_mtk_mdp_comp_power_on;
+		}
+	}
 
-	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_power_on(comp_node);
+	return 0;
+
+err_mtk_mdp_comp_power_on:
+	list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node) {
+		err = mtk_mdp_comp_power_off(comp_node);
+		if (err)
+			dev_err(&mdp->pdev->dev, "failed to power off after error. err=%d", err);
+	}
+	return status;
 }
 
-static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
+static int mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
 {
+	int status, err;
 	struct mtk_mdp_comp *comp_node;
 
-	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_power_off(comp_node);
+	list_for_each_entry(comp_node, &mdp->comp_list, node) {
+		err = mtk_mdp_comp_power_off(comp_node);
+		if (err) {
+			status = err;
+			goto err_mtk_mdp_comp_power_off;
+		}
+	}
 
 	/*
 	 * The master / rdma0 component will have pm_runtime_put called
@@ -78,6 +102,17 @@ static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
 	 * have mtk_mdp_comp_power_off called on it.
 	 */
 	mtk_mdp_comp_clock_off(&mdp->comp_self);
+
+	return 0;
+
+err_mtk_mdp_comp_power_off:
+	list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node) {
+		err = mtk_mdp_comp_power_on(comp_node);
+		if (err)
+			dev_err(&mdp->pdev->dev, "failed to power on after error. err=%d", err);
+	}
+
+	return status;
 }
 
 static void mtk_mdp_wdt_worker(struct work_struct *work)
@@ -318,18 +353,14 @@ static int __maybe_unused mtk_mdp_pm_suspend(struct device *dev)
 {
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
-	mtk_mdp_clock_off(mdp);
-
-	return 0;
+	return mtk_mdp_clock_off(mdp);
 }
 
 static int __maybe_unused mtk_mdp_pm_resume(struct device *dev)
 {
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
-	mtk_mdp_clock_on(mdp);
-
-	return 0;
+	return mtk_mdp_clock_on(mdp);
 }
 
 static int __maybe_unused mtk_mdp_suspend(struct device *dev)
-- 
2.32.0.93.g670b81a890-goog


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Re: [PATCH v5 6/8] media: mtk-mdp: propagate errors better in pm_suspend/resume

[Enric Balletbo i Serra]

Hi Eizan,

Thank you for your patch.

On 9/7/21 4:23, Eizan Miyamoto wrote:
> Up until this change, many errors were logged but ignored when powering
> on clocks and calling pm_runtime_get/put() inside mtk_mdp_core. This
> change tries to do a better job at propagating errors back to the power
> management framework.
> 

Yeah, that's nice. I commented that i dislike the error handling and seems that
you're fixing part of it here. It was a bit difficult to review the patches
because this back and forth, some problems introduced by previous patches where
fixed later. If possible I'd reorganize a bit the patches, even squash some of
the pm changes. Basically move this patch before, and do it together with the
other pm patches (even try to squash if possible).


> Signed-off-by: Eizan Miyamoto <eizan@chromium.org>
> ---
> 
> (no changes since v1)
> 
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 62 ++++++++++++++++---
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  6 +-
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 57 +++++++++++++----
>  3 files changed, 99 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> index 8a9267d0da1e..87e3f72ff02b 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> @@ -53,9 +53,9 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
>  
> -void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
> +int mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
>  {
> -	int err;
> +	int status, err;
>  
>  	if (comp->larb_dev) {
>  		err = mtk_smi_larb_get(comp->larb_dev);
> @@ -65,34 +65,76 @@ void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
>  	}
>  
>  	err = pm_runtime_get_sync(comp->dev);
> -	if (err < 0)
> +	if (err < 0) {
>  		dev_err(comp->dev, "failed to runtime get, err %d.\n", err);
> +		return err;
> +	}
> +
> +	err = mtk_mdp_comp_clock_on(comp);
> +	if (err) {
> +		dev_err(comp->dev, "failed to turn on clock. err=%d", err);
> +		status = err;
> +		goto err_mtk_mdp_comp_clock_on;
> +	}
> +
> +	return err;
> +
> +err_mtk_mdp_comp_clock_on:
> +	err = pm_runtime_put_sync(comp->dev);
> +	if (err)
> +		dev_err(comp->dev, "failed to runtime put in cleanup. err=%d", err);
>  
> -	mtk_mdp_comp_clock_on(comp);
> +	return status;
>  }
>  
> -void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp)
> +int mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp)
>  {
> -	int err;
> +	int status, err;
>  
>  	mtk_mdp_comp_clock_off(comp);
>  
>  	err = pm_runtime_put_sync(comp->dev);
> -	if (err < 0)
> +	if (err < 0) {
>  		dev_err(comp->dev, "failed to runtime put, err %d.\n", err);
> +		status = err;
> +		goto err_pm_runtime_put_sync;
> +	}
> +
> +	return 0;
> +
> +err_pm_runtime_put_sync:
> +	err = mtk_mdp_comp_clock_on(comp);
> +	if (err)
> +		dev_err(comp->dev, "failed to turn on clock in cleanup. err=%d", err);
> +
> +	return status;
>  }
>  
> -void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
> +int mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
>  {
> -	int i, err;
> +	int i, err, status;
>  
>  	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
>  		if (IS_ERR(comp->clk[i]))
>  			continue;
>  		err = clk_prepare_enable(comp->clk[i]);
> -		if (err)
> +		if (err) {
> +			status = err;
>  			dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i);
> +			goto err_clk_prepare_enable;
> +		}
> +	}
> +
> +	return 0;
> +
> +err_clk_prepare_enable:
> +	for (--i; i >= 0; i--) {
> +		if (IS_ERR(comp->clk[i]))
> +			continue;
> +		clk_disable_unprepare(comp->clk[i]);
>  	}
> +
> +	return status;
>  }
>  
>  void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> index 15ef9539a5a7..5201c47f7baa 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> @@ -23,10 +23,10 @@ struct mtk_mdp_comp {
>  
>  int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
>  
> -void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp);
> -void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp);
> +int mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp);
> +int mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp);
>  
> -void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
> +int mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
>  void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp);
>  
>  extern struct platform_driver mtk_mdp_component_driver;
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> index 74ef37eb50bd..b45d588d2659 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -50,8 +50,9 @@ static const struct of_device_id mtk_mdp_of_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids);
>  
> -static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
> +static int mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
>  {
> +	int err, status;
>  	struct mtk_mdp_comp *comp_node;
>  
>  	/*
> @@ -59,18 +60,41 @@ static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
>  	 * on it through mtk_mdp_m2m_start_streaming, making it unnecessary to
>  	 * have mtk_mdp_comp_power_on called on it.
>  	 */
> -	mtk_mdp_comp_clock_on(&mdp->comp_self);
> +	err = mtk_mdp_comp_clock_on(&mdp->comp_self);
> +	if (err)
> +		return err;
> +
> +	list_for_each_entry(comp_node, &mdp->comp_list, node) {
> +		err = mtk_mdp_comp_power_on(comp_node);
> +		if (err) {
> +			status = err;
> +			goto err_mtk_mdp_comp_power_on;
> +		}
> +	}
>  
> -	list_for_each_entry(comp_node, &mdp->comp_list, node)
> -		mtk_mdp_comp_power_on(comp_node);
> +	return 0;
> +
> +err_mtk_mdp_comp_power_on:
> +	list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node) {
> +		err = mtk_mdp_comp_power_off(comp_node);
> +		if (err)
> +			dev_err(&mdp->pdev->dev, "failed to power off after error. err=%d", err);
> +	}
> +	return status;
>  }
>  
> -static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
> +static int mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
>  {
> +	int status, err;
>  	struct mtk_mdp_comp *comp_node;
>  
> -	list_for_each_entry(comp_node, &mdp->comp_list, node)
> -		mtk_mdp_comp_power_off(comp_node);
> +	list_for_each_entry(comp_node, &mdp->comp_list, node) {
> +		err = mtk_mdp_comp_power_off(comp_node);
> +		if (err) {
> +			status = err;
> +			goto err_mtk_mdp_comp_power_off;
> +		}
> +	}
>  
>  	/*
>  	 * The master / rdma0 component will have pm_runtime_put called
> @@ -78,6 +102,17 @@ static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
>  	 * have mtk_mdp_comp_power_off called on it.
>  	 */
>  	mtk_mdp_comp_clock_off(&mdp->comp_self);
> +
> +	return 0;
> +
> +err_mtk_mdp_comp_power_off:
> +	list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node) {
> +		err = mtk_mdp_comp_power_on(comp_node);
> +		if (err)
> +			dev_err(&mdp->pdev->dev, "failed to power on after error. err=%d", err);
> +	}
> +
> +	return status;
>  }
>  
>  static void mtk_mdp_wdt_worker(struct work_struct *work)
> @@ -318,18 +353,14 @@ static int __maybe_unused mtk_mdp_pm_suspend(struct device *dev)
>  {
>  	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
>  
> -	mtk_mdp_clock_off(mdp);
> -
> -	return 0;
> +	return mtk_mdp_clock_off(mdp);
>  }
>  
>  static int __maybe_unused mtk_mdp_pm_resume(struct device *dev)
>  {
>  	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
>  
> -	mtk_mdp_clock_on(mdp);
> -
> -	return 0;
> +	return mtk_mdp_clock_on(mdp);
>  }
>  
>  static int __maybe_unused mtk_mdp_suspend(struct device *dev)
> 

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[PATCH v5 7/8] media: mtk-mdp: use mdp-rdma0 alias to point to MDP master

[Eizan Miyamoto]

... Instead of depending on the presence of a mediatek,vpu property in
the device node.

That property was originally added to link to the vpu node so that the
mtk_mdp_core driver could pass the right device to
vpu_wdt_reg_handler(). However in a previous patch in this series,
the driver has been modified to search the device tree for that node
instead.

That property was also used to indicate the primary MDP device, so that
it can be passed to the V4L2 subsystem as well as register it to be
used when setting up queues in the open() callback for the filesystem
device node that is created. In this case, assuming that the primary
MDP device is the one with a specific alias seems useable because the
alternative is to add a property to the device tree which doesn't
actually represent any facet of hardware (i.e., this being the primary
MDP device is a software decision). In other words, this solution is
equally as arbitrary, but at least it doesn't add a property to a
device node where said property is unrelated to the hardware present.

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

(no changes since v1)

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 47 ++++++++++++++-----
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c |  6 +++
 2 files changed, 42 insertions(+), 11 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index 87e3f72ff02b..de2d425efdd1 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -151,22 +151,48 @@ void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
 		mtk_smi_larb_put(comp->larb_dev);
 }
 
+/*
+ * The MDP master device node is identified by the device tree alias
+ * "mdp-rdma0".
+ */
+static int is_mdp_master(struct device *dev)
+{
+	struct device_node *aliases, *mdp_rdma0_node;
+	const char *mdp_rdma0_path;
+
+	if (!dev->of_node)
+		return 0;
+
+	aliases = of_find_node_by_path("/aliases");
+	if (!aliases) {
+		dev_err(dev, "no aliases found for mdp-rdma0");
+		return 0;
+	}
+
+	mdp_rdma0_path = of_get_property(aliases, "mdp-rdma0", NULL);
+	if (!mdp_rdma0_path) {
+		dev_err(dev, "get mdp-rdma0 property of /aliases failed");
+		return 0;
+	}
+
+	mdp_rdma0_node = of_find_node_by_path(mdp_rdma0_path);
+	if (!mdp_rdma0_node) {
+		dev_err(dev, "path resolution failed for %s", mdp_rdma0_path);
+		return 0;
+	}
+
+	return dev->of_node == mdp_rdma0_node;
+}
+
 static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
 			void *data)
 {
 	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) {
+	if (is_mdp_master(dev)) {
 		int ret;
 
 		ret = v4l2_device_register(dev, &mdp->v4l2_dev);
@@ -182,9 +208,8 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
 		}
 
 		/*
-		 * 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 DMA ops will be handled by the DMA callbacks associated with this
+		 * device;
 		 */
 		mdp->rdma_dev = dev;
 	}
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index b45d588d2659..e1fb39231248 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -158,6 +158,12 @@ static int mtk_mdp_master_bind(struct device *dev)
 		goto err_component_bind_all;
 	}
 
+	if (mdp->rdma_dev == NULL) {
+		dev_err(dev, "Primary MDP device not found");
+		status = -ENODEV;
+		goto err_component_bind_all;
+	}
+
 	vpu_node = of_find_node_by_name(NULL, "vpu");
 	if (!vpu_node) {
 		dev_err(dev, "unable to find vpu node");
-- 
2.32.0.93.g670b81a890-goog


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Re: [PATCH v5 7/8] media: mtk-mdp: use mdp-rdma0 alias to point to MDP master

[Enric Balletbo i Serra]

Hi Eizan,

Thank you for your patch.

On 9/7/21 4:23, Eizan Miyamoto wrote:
> ... Instead of depending on the presence of a mediatek,vpu property in
> the device node.
> 
> That property was originally added to link to the vpu node so that the
> mtk_mdp_core driver could pass the right device to
> vpu_wdt_reg_handler(). However in a previous patch in this series,
> the driver has been modified to search the device tree for that node
> instead.
> 
> That property was also used to indicate the primary MDP device, so that
> it can be passed to the V4L2 subsystem as well as register it to be
> used when setting up queues in the open() callback for the filesystem
> device node that is created. In this case, assuming that the primary
> MDP device is the one with a specific alias seems useable because the
> alternative is to add a property to the device tree which doesn't
> actually represent any facet of hardware (i.e., this being the primary
> MDP device is a software decision). In other words, this solution is
> equally as arbitrary, but at least it doesn't add a property to a
> device node where said property is unrelated to the hardware present.
> 
> Signed-off-by: Eizan Miyamoto <eizan@chromium.org>
> ---
> 
> (no changes since v1)
> 
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 47 ++++++++++++++-----
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.c |  6 +++
>  2 files changed, 42 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> index 87e3f72ff02b..de2d425efdd1 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> @@ -151,22 +151,48 @@ void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
>  		mtk_smi_larb_put(comp->larb_dev);
>  }
>  
> +/*
> + * The MDP master device node is identified by the device tree alias
> + * "mdp-rdma0".
> + */
> +static int is_mdp_master(struct device *dev)

bool ? (and return true/false)

> +{
> +	struct device_node *aliases, *mdp_rdma0_node;
> +	const char *mdp_rdma0_path;
> +
> +	if (!dev->of_node)
> +		return 0;
> +
> +	aliases = of_find_node_by_path("/aliases");
> +	if (!aliases) {
> +		dev_err(dev, "no aliases found for mdp-rdma0");
> +		return 0;
> +	}
> +
> +	mdp_rdma0_path = of_get_property(aliases, "mdp-rdma0", NULL);
> +	if (!mdp_rdma0_path) {
> +		dev_err(dev, "get mdp-rdma0 property of /aliases failed");
> +		return 0;
> +	}
> +
> +	mdp_rdma0_node = of_find_node_by_path(mdp_rdma0_path);
> +	if (!mdp_rdma0_node) {
> +		dev_err(dev, "path resolution failed for %s", mdp_rdma0_path);
> +		return 0;
> +	}
> +
> +	return dev->of_node == mdp_rdma0_node;
> +}
> +
>  static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
>  			void *data)
>  {
>  	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) {
> +	if (is_mdp_master(dev)) {
>  		int ret;
>  
>  		ret = v4l2_device_register(dev, &mdp->v4l2_dev);
> @@ -182,9 +208,8 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
>  		}
>  
>  		/*
> -		 * 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 DMA ops will be handled by the DMA callbacks associated with this
> +		 * device;
>  		 */
>  		mdp->rdma_dev = dev;
>  	}
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> index b45d588d2659..e1fb39231248 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -158,6 +158,12 @@ static int mtk_mdp_master_bind(struct device *dev)
>  		goto err_component_bind_all;
>  	}
>  
> +	if (mdp->rdma_dev == NULL) {
> +		dev_err(dev, "Primary MDP device not found");
> +		status = -ENODEV;
> +		goto err_component_bind_all;
> +	}
> +
>  	vpu_node = of_find_node_by_name(NULL, "vpu");
>  	if (!vpu_node) {
>  		dev_err(dev, "unable to find vpu node");
> 

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[PATCH v5 8/8] dts: mtk-mdp: remove mediatek, vpu property from primary MDP device

[Eizan Miyamoto]

It is no longer used by the mediatek MDP driver.

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

(no changes since v1)

 arch/arm64/boot/dts/mediatek/mt8173.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
index d502073b551f..872427748110 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
@@ -1010,7 +1010,6 @@ mdp_rdma0: rdma@14001000 {
 			power-domains = <&spm MT8173_POWER_DOMAIN_MM>;
 			iommus = <&iommu M4U_PORT_MDP_RDMA0>;
 			mediatek,larb = <&larb0>;
-			mediatek,vpu = <&vpu>;
 		};
 
 		mdp_rdma1: rdma@14002000 {
-- 
2.32.0.93.g670b81a890-goog


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Re: [PATCH v5 8/8] dts: mtk-mdp: remove mediatek,vpu property from primary MDP device

[Enric Balletbo i Serra]

Hi Eizan,

Thank you for your patch.

On 9/7/21 4:23, Eizan Miyamoto wrote:
> It is no longer used by the mediatek MDP driver.
> 
> Signed-off-by: Eizan Miyamoto <eizan@chromium.org>
> ---
> 
> (no changes since v1)
> 
>  arch/arm64/boot/dts/mediatek/mt8173.dtsi | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> index d502073b551f..872427748110 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> @@ -1010,7 +1010,6 @@ mdp_rdma0: rdma@14001000 {
>  			power-domains = <&spm MT8173_POWER_DOMAIN_MM>;
>  			iommus = <&iommu M4U_PORT_MDP_RDMA0>;
>  			mediatek,larb = <&larb0>;
> -			mediatek,vpu = <&vpu>;


Should be also removed from the documentation binding?

>  		};
>  
>  		mdp_rdma1: rdma@14002000 {
> 

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