On Mon, 2021-08-02 at 20:12 +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> > --- > > 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); > + } Maybe 'of_node_put(vpu_node)' should be called when 'mdp->vpu_dev' is valid. > + 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); > -- > 2.32.0.554.ge1b32706d8-goog >
