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Subject[PATCH 1/2] media: stm32-dcmi: add media controller support
Date
Add media controller support to dcmi.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
---
drivers/media/platform/Kconfig | 2 +-
drivers/media/platform/stm32/stm32-dcmi.c | 84 +++++++++++++++++++++++--------
2 files changed, 64 insertions(+), 22 deletions(-)

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 1611ec2..b726c64 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -121,7 +121,7 @@ config VIDEO_S3C_CAMIF

config VIDEO_STM32_DCMI
tristate "STM32 Digital Camera Memory Interface (DCMI) support"
- depends on VIDEO_V4L2 && OF
+ depends on VIDEO_V4L2 && OF && MEDIA_CONTROLLER
depends on ARCH_STM32 || COMPILE_TEST
select VIDEOBUF2_DMA_CONTIG
select V4L2_FWNODE
diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 2142883..488858e 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -172,6 +172,9 @@ struct stm32_dcmi {

/* Ensure DMA operations atomicity */
struct mutex dma_lock;
+
+ struct media_device mdev;
+ struct media_pad vid_cap_pad;
};

static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
@@ -1570,21 +1573,12 @@ static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
dev_err(dcmi->dev, "Could not get sensor bounds\n");
return ret;
}
-
ret = dcmi_set_default_fmt(dcmi);
if (ret) {
dev_err(dcmi->dev, "Could not set default format\n");
return ret;
}

- ret = video_register_device(dcmi->vdev, VFL_TYPE_GRABBER, -1);
- if (ret) {
- dev_err(dcmi->dev, "Failed to register video device\n");
- return ret;
- }
-
- dev_dbg(dcmi->dev, "Device registered as %s\n",
- video_device_node_name(dcmi->vdev));
return 0;
}

@@ -1673,6 +1667,12 @@ static int dcmi_graph_init(struct stm32_dcmi *dcmi)
return 0;
}

+static void dcmi_graph_deinit(struct stm32_dcmi *dcmi)
+{
+ v4l2_async_notifier_unregister(&dcmi->notifier);
+ v4l2_async_notifier_cleanup(&dcmi->notifier);
+}
+
static int dcmi_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@@ -1775,10 +1775,27 @@ static int dcmi_probe(struct platform_device *pdev)

q = &dcmi->queue;

+ dcmi->v4l2_dev.mdev = &dcmi->mdev;
+
+ /* Initialize media device */
+ strscpy(dcmi->mdev.model, DRV_NAME, sizeof(dcmi->mdev.model));
+ snprintf(dcmi->mdev.bus_info, sizeof(dcmi->mdev.bus_info),
+ "platform:%s", DRV_NAME);
+ dcmi->mdev.dev = &pdev->dev;
+ media_device_init(&dcmi->mdev);
+
+ /* Register the media device */
+ ret = media_device_register(&dcmi->mdev);
+ if (ret) {
+ dev_err(dcmi->dev, "Failed to register media device (%d)\n",
+ ret);
+ goto err_media_device_cleanup;
+ }
+
/* Initialize the top-level structure */
ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
if (ret)
- goto err_dma_release;
+ goto err_media_device_unregister;

dcmi->vdev = video_device_alloc();
if (!dcmi->vdev) {
@@ -1798,6 +1815,25 @@ static int dcmi_probe(struct platform_device *pdev)
V4L2_CAP_READWRITE;
video_set_drvdata(dcmi->vdev, dcmi);

+ /* Media entity pads */
+ dcmi->vid_cap_pad.flags = MEDIA_PAD_FL_SINK;
+ ret = media_entity_pads_init(&dcmi->vdev->entity,
+ 1, &dcmi->vid_cap_pad);
+ if (ret) {
+ dev_err(dcmi->dev, "Failed to init media entity pad\n");
+ goto err_device_unregister;
+ }
+ dcmi->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
+
+ ret = video_register_device(dcmi->vdev, VFL_TYPE_GRABBER, -1);
+ if (ret) {
+ dev_err(dcmi->dev, "Failed to register video device\n");
+ goto err_media_entity_cleanup;
+ }
+
+ dev_dbg(dcmi->dev, "Device registered as %s\n",
+ video_device_node_name(dcmi->vdev));
+
/* Buffer queue */
q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
@@ -1813,18 +1849,18 @@ static int dcmi_probe(struct platform_device *pdev)
ret = vb2_queue_init(q);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to initialize vb2 queue\n");
- goto err_device_release;
+ goto err_media_entity_cleanup;
}

ret = dcmi_graph_init(dcmi);
if (ret < 0)
- goto err_device_release;
+ goto err_media_entity_cleanup;

/* Reset device */
ret = reset_control_assert(dcmi->rstc);
if (ret) {
dev_err(&pdev->dev, "Failed to assert the reset line\n");
- goto err_cleanup;
+ goto err_graph_deinit;
}

usleep_range(3000, 5000);
@@ -1832,7 +1868,7 @@ static int dcmi_probe(struct platform_device *pdev)
ret = reset_control_deassert(dcmi->rstc);
if (ret) {
dev_err(&pdev->dev, "Failed to deassert the reset line\n");
- goto err_cleanup;
+ goto err_graph_deinit;
}

dev_info(&pdev->dev, "Probe done\n");
@@ -1843,13 +1879,17 @@ static int dcmi_probe(struct platform_device *pdev)

return 0;

-err_cleanup:
- v4l2_async_notifier_cleanup(&dcmi->notifier);
-err_device_release:
- video_device_release(dcmi->vdev);
+err_graph_deinit:
+ dcmi_graph_deinit(dcmi);
+err_media_entity_cleanup:
+ media_entity_cleanup(&dcmi->vdev->entity);
err_device_unregister:
v4l2_device_unregister(&dcmi->v4l2_dev);
-err_dma_release:
+err_media_device_unregister:
+ media_device_unregister(&dcmi->mdev);
+err_media_device_cleanup:
+ media_device_cleanup(&dcmi->mdev);
+
dma_release_channel(dcmi->dma_chan);

return ret;
@@ -1861,9 +1901,11 @@ static int dcmi_remove(struct platform_device *pdev)

pm_runtime_disable(&pdev->dev);

- v4l2_async_notifier_unregister(&dcmi->notifier);
- v4l2_async_notifier_cleanup(&dcmi->notifier);
+ dcmi_graph_deinit(dcmi);
+ media_entity_cleanup(&dcmi->vdev->entity);
v4l2_device_unregister(&dcmi->v4l2_dev);
+ media_device_unregister(&dcmi->mdev);
+ media_device_cleanup(&dcmi->mdev);

dma_release_channel(dcmi->dma_chan);

--
2.7.4
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