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From: houlong wei <houlong.wei@mediatek.com>
To: Eizan Miyamoto <eizan@chromium.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "wenst@chromium.org" <wenst@chromium.org>,
	"Yong Wu (吴勇)" <Yong.Wu@mediatek.com>,
	"enric.balletbo@collabora.com" <enric.balletbo@collabora.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"chunkuang.hu@kernel.org" <chunkuang.hu@kernel.org>,
	"Andrew-CT Chen (陳智迪)" <Andrew-CT.Chen@mediatek.com>,
	"Matthias Brugger" <matthias.bgg@gmail.com>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>,
	"Minghsiu Tsai (蔡明修)" <Minghsiu.Tsai@mediatek.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
	"linux-mediatek@lists.infradead.org"
	<linux-mediatek@lists.infradead.org>,
	houlong.wei@mediatek.com
Subject: Re: [PATCH v6 7/9] media: mtk-mdp: use mdp-rdma0 alias to point to MDP master
Date: Mon, 16 Aug 2021 11:00:35 +0800	[thread overview]
Message-ID: <bf98c5ee749bca755bd46832f858536dbf51a2a4.camel@mediatek.com> (raw)
In-Reply-To: <20210802220943.v6.7.I2049e180dca12e0d1b3178bfc7292dcf9e05ac28@changeid>

On Mon, 2021-08-02 at 20:12 +0800, 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 | 56 +++++++++++++--
> ----
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 36 ++++++++----
>  2 files changed, 64 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> index 85ef274841a3..9527649de98e 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> @@ -151,29 +151,50 @@ void mtk_mdp_comp_clock_off(struct mtk_mdp_comp
> *comp)
>  		mtk_smi_larb_put(comp->larb_dev);
>  }
>  
> -static int mtk_mdp_comp_bind(struct device *dev, struct device
> *master, void *data)
> +/*
> + * The MDP master device node is identified by the device tree alias
> + * "mdp-rdma0".
> + */
> +static bool is_mdp_master(struct device *dev)
> +{
> +	struct device_node *aliases, *mdp_rdma0_node;
> +	const char *mdp_rdma0_path;
> +
> +	if (!dev->of_node)
> +		return false;
> +
> +	aliases = of_find_node_by_path("/aliases");
> +	if (!aliases) {
> +		dev_err(dev, "no aliases found for mdp-rdma0");
> +		return false;
> +	}
> +
> +	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 false;
> +	}
> +
> +	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 false;
> +	}
> +

Hi Eizan,

"mdp-rdma0" may be not the only one master device node. In fact, there
are 2 "mdp-rdma" in mt8173. You can see "mdp_rdma1" via below link.

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm64/boot/dts/mediatek/mt8173.dtsi?h=v5.13.11#n1016
If we add "mediatek,mt8173-mdp" to "mdp_rdma1" like below, we will have
one more V4L2 video devie node.

		mdp_rdma1: rdma@14002000 {
			compatible = "mediatek,mt8173-mdp-rdma",
				     "mediatek,mt8173-mdp";
			...
		}

We should consider the case that there are more than one "MDP_RDMA"
components. 

Regards,
Houlong

> +	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;
>  
> -		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");
> @@ -187,9 +208,8 @@ static int mtk_mdp_comp_bind(struct device *dev,
> struct device *master, void *da
>  		}
>  
>  		/*
> -		 * 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 50eafcc9993d..6a775463399c 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -150,8 +150,9 @@ static void release_of(struct device *dev, void
> *data)
>  
>  static int mtk_mdp_master_bind(struct device *dev)
>  {
> -	int status;
>  	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
> +	struct device_node *vpu_node;
> +	int status;
>  
>  	status = component_bind_all(dev, mdp);
>  	if (status) {
> @@ -159,15 +160,30 @@ 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");
> +	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");
> +		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);
> -- 
> 2.32.0.554.ge1b32706d8-goog
> 

  parent reply	other threads:[~2021-08-16  3:00 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 12:12 [PATCH v6 0/9] Refactor MTK MDP driver into core/components Eizan Miyamoto
2021-08-02 12:12 ` [PATCH v6 1/9] mtk-mdp: propagate errors from clock_on Eizan Miyamoto
2021-08-03 10:26   ` Enric Balletbo Serra
2021-08-05  6:06   ` Dafna Hirschfeld
2021-08-09  3:23     ` Eizan Miyamoto
2021-08-09  7:42       ` Dafna Hirschfeld
2021-08-16  0:46   ` houlong wei
2021-08-02 12:12 ` [PATCH v6 2/9] mtk-mdp: add driver to probe mdp components Eizan Miyamoto
2021-08-03 10:26   ` Enric Balletbo Serra
2021-08-05  6:40   ` Dafna Hirschfeld
2021-08-09  3:23     ` Eizan Miyamoto
2021-08-09  7:53       ` Dafna Hirschfeld
2021-08-11 11:15         ` Eizan Miyamoto
2021-08-16  1:05   ` houlong wei
2021-08-02 12:12 ` [PATCH v6 3/9] mtk-mdp: use pm_runtime in MDP component driver Eizan Miyamoto
2021-08-03 10:26   ` Enric Balletbo Serra
2021-08-16  1:07   ` houlong wei
2021-08-02 12:12 ` [PATCH v6 4/9] media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on Eizan Miyamoto
2021-08-03 10:27   ` Enric Balletbo Serra
2021-08-16  1:10   ` houlong wei
2021-08-02 12:12 ` [PATCH v6 5/9] mtk-mdp: make mdp driver to be loadable by platform_device_register*() Eizan Miyamoto
2021-08-03 10:27   ` Enric Balletbo Serra
2021-08-16  1:15   ` houlong wei
2021-08-16  3:37   ` houlong wei
2021-08-02 12:12 ` [PATCH v6 6/9] soc: mediatek: mmsys: instantiate mdp virtual device from mmsys Eizan Miyamoto
2021-08-03 10:27   ` Enric Balletbo Serra
2021-08-16  1:18   ` houlong wei
2021-08-02 12:12 ` [PATCH v6 7/9] media: mtk-mdp: use mdp-rdma0 alias to point to MDP master Eizan Miyamoto
2021-08-03 10:27   ` Enric Balletbo Serra
2021-08-03 11:46     ` Eizan Miyamoto
2021-08-16  3:00   ` houlong wei [this message]
2021-08-16  4:52     ` houlong wei
2021-08-18  7:50       ` Eizan Miyamoto
2021-08-18 15:42         ` houlong wei
2021-08-18  7:43     ` Eizan Miyamoto
2021-08-18 15:34       ` houlong wei
2021-08-02 12:12 ` [PATCH v6 8/9] dts: mtk-mdp: remove mediatek,vpu property from primary MDP device Eizan Miyamoto
2021-08-03 10:27   ` Enric Balletbo Serra
2021-08-02 12:12 ` [PATCH v6 9/9] dt-bindings: mediatek: remove vpu requirement from mtk-mdp Eizan Miyamoto
2021-08-03 10:27   ` Enric Balletbo Serra
2021-08-06 21:47   ` Rob Herring
2021-08-03 10:29 ` [PATCH v6 0/9] Refactor MTK MDP driver into core/components Enric Balletbo Serra

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