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Subject[PATCH v2 4/8] mtk-mdp: soc: mediatek: register mdp from mmsys
Date
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.

(am from https://patchwork.kernel.org/patch/12195523/)
(also found at https://lore.kernel.org/r/20210410091128.31823-15-yong.wu@mediatek.com)

Conflicts:
drivers/memory/mtk-smi.c

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

(am from https://patchwork.kernel.org/patch/12195507/)
(also found at https://lore.kernel.org/r/20210410091128.31823-13-yong.wu@mediatek.com)

(am from https://patchwork.kernel.org/patch/12195485/)
(also found at https://lore.kernel.org/r/20210410091128.31823-5-yong.wu@mediatek.com)

Conflicts:
drivers/memory/mtk-smi.c

(am from https://patchwork.kernel.org/patch/12195481/)
(also found at https://lore.kernel.org/r/20210410091128.31823-3-yong.wu@mediatek.com)

(am from https://patchwork.kernel.org/patch/12195479/)
(also found at https://lore.kernel.org/r/20210410091128.31823-2-yong.wu@mediatek.com)

(am from https://patchwork.kernel.org/patch/12195479/)
(also found at https://lore.kernel.org/r/20210410091128.31823-2-yong.wu@mediatek.com)

---

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 9a12717ce416..fdbb46a5330a 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -104,8 +104,45 @@ 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;
@@ -160,23 +197,9 @@ 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 5e71496e2517..267e4cb4bf32 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -121,6 +121,17 @@ 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);
@@ -133,6 +144,8 @@ 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:
@@ -191,8 +204,13 @@ 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 */
@@ -225,16 +243,6 @@ 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");
@@ -250,29 +258,8 @@ 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");
@@ -284,22 +271,12 @@ 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;
}
@@ -371,7 +348,6 @@ 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 230f531400ca..78c3c77cd226 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 93c9df15084a..a7051d48ea32 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 79e55150210e..e518ea5d0694 100644
--- a/drivers/soc/mediatek/mtk-mmsys.c
+++ b/drivers/soc/mediatek/mtk-mmsys.c
@@ -90,6 +90,7 @@ 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);
@@ -115,10 +116,27 @@ 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[] = {
--
2.32.0.272.g935e593368-goog
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