Re: [PATCH v7 5/7] mtk-mdp: make mdp driver to be loadable by platform_device_register*()

From: houlong wei
Date: Wed Aug 25 2021 - 04:18:47 EST

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In reply to: Eizan Miyamoto: "[PATCH v7 5/7] mtk-mdp: make mdp driver to be loadable by platform_device_register*()"
Next in thread: Eizan Miyamoto: "[PATCH v7 6/7] soc: mediatek: mmsys: instantiate mdp virtual device from mmsys"
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Hi Eizan,
I have inline comment below.

Regards,
Houlong

On Wed, 2021-08-25 at 14:33 +0800, Eizan Miyamoto wrote:
> Rather than hanging the MDP master component driver off of the rdma0
> device, make it possible too create a "virtual" device by registering
> it with platform_device_register_*() to be probed by the mtk_mdp_core
> driver.
>
> Broadly, three interdependent things are done by this change:
> - Make it is possible to search for MDP devices in the device tree
> through the grandparent device's of_node.
> - v4l-related setup is moved into from the mtk_mdp_core driver to the
> mtk_mdp_comp driver.
> - Presence of a mediatek,vpu property in an MDP component device node
> is used to determine what device to use when dispatching DMA ops from
> the relevant ioctl, and also do V4L2 initialization in this case.
>
> Signed-off-by: Eizan Miyamoto <eizan@xxxxxxxxxxxx>
> Reviewed-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> Reviewed-by: Houlong Wei <houlong.wei@xxxxxxxxxxxx>
> ---
>
> Changes in v7:
> - Drop last two changes from this series related to removing the vpu
> property from the mdp_rdma0 device node
>
> Changes in v6:
> - Don't propagate errors from clock_on/off as an afterthought.
> - Split apart modifying mdp driver to be loadable from mmsys from
> actually loading it from mmsys into two changs to make review easier.
> - Update devicetree bindings to reflect no longer needing the
> mediatek,vpu property in the mdp_rdma0 device node.
> - Some stylistic cleanups.
>
> Changes in v5:
> - rebase and 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 +-
> 4 files changed, 60 insertions(+), 59 deletions(-)
>
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> index 7b6c8a3f3455..85ef274841a3 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> @@ -155,8 +155,45 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master, void *da
> {
> 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);
> + }

The 'vpu_node' should be put when 'mdp->vpu_dev' is valid.

mdp->vpu_dev = of_find_device_by_node(vpu_node);
of_node_put(vpu_node);
if (WARN_ON(!mdp->vpu_dev))
dev_err(dev, "vpu pdev failed\n");

I commented it before, refer to
http://lists.infradead.org/pipermail/linux-mediatek/2021-August/028370.html

> + 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;
> @@ -237,23 +274,9 @@ 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 a72a9ba41ea6..50eafcc9993d 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -159,6 +159,17 @@ 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);
> @@ -170,6 +181,8 @@ 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:
> @@ -228,8 +241,13 @@ 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 */
> @@ -262,16 +280,6 @@ 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");
> @@ -287,29 +295,8 @@ 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");
> @@ -321,22 +308,12 @@ 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;
> }
> @@ -404,7 +381,6 @@ 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);

Next message: Michael Riesch: "Re: [PATCH 1/1] arm64: dts: rockchip: add missing rockchip,grf property to rk356x"
Previous message: Sakari Ailus: "Re: [PATCH] dt-bindings: Use 'enum' instead of 'oneOf' plus 'const' entries"
In reply to: Eizan Miyamoto: "[PATCH v7 5/7] mtk-mdp: make mdp driver to be loadable by platform_device_register*()"
Next in thread: Eizan Miyamoto: "[PATCH v7 6/7] soc: mediatek: mmsys: instantiate mdp virtual device from mmsys"
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