Message-ID: <1623161430.7079.15.camel@mhfsdcap03>
Date:   Tue, 8 Jun 2021 22:10:30 +0800
From:   houlong wei <houlong.wei@...iatek.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
CC:     Eizan Miyamoto <eizan@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        Yong Wu (吴勇) 
        <Yong.Wu@...iatek.com>,
        "Andrew-CT Chen (陳智迪)" 
        <Andrew-CT.Chen@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Minghsiu Tsai (蔡明修)" 
        <Minghsiu.Tsai@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 1/4] mtk-mdp: add driver to probe mdp components

Hi Eizan,

Thanks for your patch. I have inline comments below.

Houlong


On Fri, 2021-05-14 at 16:19 +0800, Enric Balletbo i Serra wrote:
> Hi Eizan,
> 
> Thank kyou for your patch.
> 
> On 23/4/21 7:58, 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@...omium.org>
> > ---
> > 
> >  drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 139 ++++++++++++--
> >  drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  26 +--
> >  drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 175 +++++++++++++-----
> >  drivers/media/platform/mtk-mdp/mtk_mdp_core.h |   1 +
> >  4 files changed, 255 insertions(+), 86 deletions(-)
> > 
> > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> > index 1e3833f1c9ae..3fbbcf05440a 100644
> > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> > @@ -5,13 +5,51 @@
> >   */
> >  
> >  #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 "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

Reszer is the typo for Resizer. Can you help to fix it, although it
already exists in the original version ?

> > + * @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)
> >  {
> > @@ -23,8 +61,8 @@ 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);
> 
> I think youcan take advantage of the new line lenght limit and put all in one
> line here.
> 
> 
> >  	}
> >  }
> >  
> > @@ -39,15 +77,40 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
> >  	}
> >  }
> >  
> > -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)
> >  {
> >  	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);
> > @@ -55,23 +118,71 @@ 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;
> >  	}
> >  
> >  	return 0;
> >  
> > -put_dev:
> > -	of_node_put(comp->dev_node);
> > +err:
> > +	dev_err(dev, "err %d\n", ret);
> 
> This error is too generic. You can remove. Anyway you're printing the same error
> code if mtk_mdp_comp_init fails in probe function, there makes more sense.
> 
> >  
> >  	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");
> 
> This is the thing that I'm not completely sure is doing the right thing. Having
> a DT propriety to indicate to skip the probing is really weird to me. Also the
> name is quite confusing. When I read this name I'd expect mediatek,vpu being a
> phandle to the VPU device node. If there is a master and childs below from
> hardware POV, the DT graph should reflect that, if this is only a way to
> instantiate properly the devices then I think we can find other solutions. If
> you know that RDMA is always the master maybe we can just find this node.
> 
> Other thoughts?
> 

One way to judge it is to compare the of_device_get_match_data(dev) with
MTK_MDP_RDMA.

> 
> > +		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 36bc1b8f6222..956d20c01e34 100644
> > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> > @@ -7,41 +7,21 @@
> >  #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,
> > -	MTK_MDP_COMP_TYPE_MAX,
> > -};
> > -
> >  /**
> >   * 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
> > - * @type:	component type
> >   */
> >  struct mtk_mdp_comp {
> >  	struct list_head	node;
> > -	struct device_node	*dev_node;
> >  	struct clk		*clk[2];
> > -	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 70a8eab16863..d79bf7f0031a 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>
> > @@ -18,6 +19,7 @@
> >  #include <linux/pm_runtime.h>
> >  #include <linux/workqueue.h>
> >  
> > +#include "mtk_mdp_comp.h"
> >  #include "mtk_mdp_core.h"
> >  #include "mtk_mdp_m2m.h"
> >  #include "mtk_vpu.h"
> > @@ -31,16 +33,12 @@ 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
> >  	},
> >  	{ },
> >  };
> > @@ -90,6 +88,64 @@ 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)
> >  {
> > @@ -107,8 +163,8 @@ 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)
> > @@ -133,36 +189,43 @@ 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;

'pdev' is used above, so we'd better to use another variable name here
to avoid confusion.

> >  
> > -		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);
> > @@ -187,18 +250,12 @@ 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);
> > @@ -206,15 +263,25 @@ 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:
> > @@ -226,11 +293,6 @@ 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;
> >  }
> > @@ -238,11 +300,10 @@ 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);
> > @@ -251,10 +312,8 @@ 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;
> > @@ -309,7 +368,25 @@ 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@...iatek.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 a7da14b97077..230f531400ca 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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