* [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start
@ 2025-12-18 9:23 Michael Tretter
2025-12-18 9:23 ` [PATCH v2 1/3] media: imx-csi: move media_pipeline to video device Michael Tretter
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Michael Tretter @ 2025-12-18 9:23 UTC (permalink / raw)
To: Steve Longerbeam, Philipp Zabel, Frank Li, Mauro Carvalho Chehab,
Fabio Estevam, Greg Kroah-Hartman, Shawn Guo, Sascha Hauer
Cc: linux-media, imx, linux-arm-kernel, Pengutronix Kernel Team,
linux-staging, Michael Tretter
The imx media device currently assumes that there is only a single media
pipeline. However, the media graph has multiple imx capture devices.
These may be started separately on media pipelines if they don't cause
conflicts in the media graph.
Move the media pipeline from the media device to the capture devices to
properly track and handle multiple media pipelines for the imx-csi.
Refactor the code to start the media pipeline from the driver to help
the reader.
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
Changes in v2:
- Improve code readability in Patch 2
- Update commit message of Patch 3 as suggested by Frank Li
- Link to v1: https://patch.msgid.link/20251107-media-imx-cleanup-v1-0-f82a693c28f4@pengutronix.de
---
Michael Tretter (3):
media: imx-csi: move media_pipeline to video device
media: imx-csi: explicitly start media pipeline on pad 0
media: imx-csi: use media_pad_is_streaming helper
drivers/staging/media/imx/imx-media-capture.c | 8 ++++----
drivers/staging/media/imx/imx-media-utils.c | 12 ++++++++----
drivers/staging/media/imx/imx-media.h | 7 ++++---
3 files changed, 16 insertions(+), 11 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251107-media-imx-cleanup-9022d941ae44
Best regards,
--
Michael Tretter <m.tretter@pengutronix.de>
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v2 1/3] media: imx-csi: move media_pipeline to video device
2025-12-18 9:23 [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start Michael Tretter
@ 2025-12-18 9:23 ` Michael Tretter
2025-12-18 9:23 ` [PATCH v2 2/3] media: imx-csi: explicitly start media pipeline on pad 0 Michael Tretter
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Michael Tretter @ 2025-12-18 9:23 UTC (permalink / raw)
To: Steve Longerbeam, Philipp Zabel, Frank Li, Mauro Carvalho Chehab,
Fabio Estevam, Greg Kroah-Hartman, Shawn Guo, Sascha Hauer
Cc: linux-media, imx, linux-arm-kernel, Pengutronix Kernel Team,
linux-staging, Michael Tretter
The imx-media driver has a single imx_media_device. Attaching the
media_pipeline to the imx_media_device prevents the execution of
multiple media pipelines on the device. This should be possible as long
as the media_pipelines don't use the same pads or pads that be
configured while the other media pipeline is streaming.
Move the media_pipeline to the imx_media_video_dev to be able to
construct media pipelines per imx capture device.
If different media pipelines in the media device conflict, the
validation will fail. Thus, the pipeline will fail to start and signal
an error to user space.
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
Changes in v2:
- none
---
drivers/staging/media/imx/imx-media-capture.c | 8 ++++----
drivers/staging/media/imx/imx-media-utils.c | 3 ++-
drivers/staging/media/imx/imx-media.h | 7 ++++---
3 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index e9cef7af000a..bfd71d25facc 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -722,8 +722,8 @@ static int capture_start_streaming(struct vb2_queue *vq, unsigned int count)
goto return_bufs;
}
- ret = imx_media_pipeline_set_stream(priv->md, &priv->src_sd->entity,
- true);
+ ret = imx_media_pipeline_set_stream(priv->md, &priv->vdev,
+ &priv->src_sd->entity, true);
if (ret) {
dev_err(priv->dev, "pipeline start failed with %d\n", ret);
goto return_bufs;
@@ -749,8 +749,8 @@ static void capture_stop_streaming(struct vb2_queue *vq)
unsigned long flags;
int ret;
- ret = imx_media_pipeline_set_stream(priv->md, &priv->src_sd->entity,
- false);
+ ret = imx_media_pipeline_set_stream(priv->md, &priv->vdev,
+ &priv->src_sd->entity, false);
if (ret)
dev_warn(priv->dev, "pipeline stop failed with %d\n", ret);
diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
index 1b5af8945e6b..f520529a7cfe 100644
--- a/drivers/staging/media/imx/imx-media-utils.c
+++ b/drivers/staging/media/imx/imx-media-utils.c
@@ -749,6 +749,7 @@ EXPORT_SYMBOL_GPL(imx_media_pipeline_subdev);
* Turn current pipeline streaming on/off starting from entity.
*/
int imx_media_pipeline_set_stream(struct imx_media_dev *imxmd,
+ struct imx_media_video_dev *vdev,
struct media_entity *entity,
bool on)
{
@@ -762,7 +763,7 @@ int imx_media_pipeline_set_stream(struct imx_media_dev *imxmd,
mutex_lock(&imxmd->md.graph_mutex);
if (on) {
- ret = __media_pipeline_start(entity->pads, &imxmd->pipe);
+ ret = __media_pipeline_start(entity->pads, &vdev->pipe);
if (ret)
goto out;
ret = v4l2_subdev_call(sd, video, s_stream, 1);
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index f095d9134fee..8b65f79b125f 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h
@@ -104,6 +104,9 @@ struct imx_media_buffer {
struct imx_media_video_dev {
struct video_device *vfd;
+ /* the pipeline object */
+ struct media_pipeline pipe;
+
/* the user format */
struct v4l2_pix_format fmt;
/* the compose rectangle */
@@ -145,9 +148,6 @@ struct imx_media_dev {
struct media_device md;
struct v4l2_device v4l2_dev;
- /* the pipeline object */
- struct media_pipeline pipe;
-
struct mutex mutex; /* protect elements below */
/* master video device list */
@@ -223,6 +223,7 @@ int imx_media_alloc_dma_buf(struct device *dev,
int size);
int imx_media_pipeline_set_stream(struct imx_media_dev *imxmd,
+ struct imx_media_video_dev *vdev,
struct media_entity *entity,
bool on);
--
2.47.3
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v2 2/3] media: imx-csi: explicitly start media pipeline on pad 0
2025-12-18 9:23 [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start Michael Tretter
2025-12-18 9:23 ` [PATCH v2 1/3] media: imx-csi: move media_pipeline to video device Michael Tretter
@ 2025-12-18 9:23 ` Michael Tretter
2025-12-18 9:23 ` [PATCH v2 3/3] media: imx-csi: use media_pad_is_streaming helper Michael Tretter
2026-01-23 16:57 ` [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start Michael Tretter
3 siblings, 0 replies; 6+ messages in thread
From: Michael Tretter @ 2025-12-18 9:23 UTC (permalink / raw)
To: Steve Longerbeam, Philipp Zabel, Frank Li, Mauro Carvalho Chehab,
Fabio Estevam, Greg Kroah-Hartman, Shawn Guo, Sascha Hauer
Cc: linux-media, imx, linux-arm-kernel, Pengutronix Kernel Team,
linux-staging, Michael Tretter
entity->pads is an array that contains all the pads of an entity.
Calling __media_pipeline_start() or __media_pipeline_stop() on the pads,
implicitly starts the pipeline with the first pad in this array as
origin.
Explicitly use the first pad to start the pipeline to make this more
obvious to the reader.
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
Changes in v2:
- move struct media_pad *pad; before int ret = 0; for better read
---
drivers/staging/media/imx/imx-media-utils.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
index f520529a7cfe..bd9af147a801 100644
--- a/drivers/staging/media/imx/imx-media-utils.c
+++ b/drivers/staging/media/imx/imx-media-utils.c
@@ -754,6 +754,7 @@ int imx_media_pipeline_set_stream(struct imx_media_dev *imxmd,
bool on)
{
struct v4l2_subdev *sd;
+ struct media_pad *pad;
int ret = 0;
if (!is_media_entity_v4l2_subdev(entity))
@@ -762,17 +763,19 @@ int imx_media_pipeline_set_stream(struct imx_media_dev *imxmd,
mutex_lock(&imxmd->md.graph_mutex);
+ pad = &entity->pads[0];
+
if (on) {
- ret = __media_pipeline_start(entity->pads, &vdev->pipe);
+ ret = __media_pipeline_start(pad, &vdev->pipe);
if (ret)
goto out;
ret = v4l2_subdev_call(sd, video, s_stream, 1);
if (ret)
- __media_pipeline_stop(entity->pads);
+ __media_pipeline_stop(pad);
} else {
v4l2_subdev_call(sd, video, s_stream, 0);
- if (media_pad_pipeline(entity->pads))
- __media_pipeline_stop(entity->pads);
+ if (media_pad_pipeline(pad))
+ __media_pipeline_stop(pad);
}
out:
--
2.47.3
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v2 3/3] media: imx-csi: use media_pad_is_streaming helper
2025-12-18 9:23 [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start Michael Tretter
2025-12-18 9:23 ` [PATCH v2 1/3] media: imx-csi: move media_pipeline to video device Michael Tretter
2025-12-18 9:23 ` [PATCH v2 2/3] media: imx-csi: explicitly start media pipeline on pad 0 Michael Tretter
@ 2025-12-18 9:23 ` Michael Tretter
2025-12-18 15:35 ` Frank Li
2026-01-23 16:57 ` [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start Michael Tretter
3 siblings, 1 reply; 6+ messages in thread
From: Michael Tretter @ 2025-12-18 9:23 UTC (permalink / raw)
To: Steve Longerbeam, Philipp Zabel, Frank Li, Mauro Carvalho Chehab,
Fabio Estevam, Greg Kroah-Hartman, Shawn Guo, Sascha Hauer
Cc: linux-media, imx, linux-arm-kernel, Pengutronix Kernel Team,
linux-staging, Michael Tretter
The media_pad_is_streaming() helper is explicitly intended to check
whether a pad has been started with media_pipeline_start(). Use it
instead of relying on the implicit assumption that a pad with a
pipeline is streaming.
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
Changes in v2:
- Update commit message as suggested by Frank Li
---
drivers/staging/media/imx/imx-media-utils.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
index bd9af147a801..1a2e5e40c99c 100644
--- a/drivers/staging/media/imx/imx-media-utils.c
+++ b/drivers/staging/media/imx/imx-media-utils.c
@@ -774,7 +774,7 @@ int imx_media_pipeline_set_stream(struct imx_media_dev *imxmd,
__media_pipeline_stop(pad);
} else {
v4l2_subdev_call(sd, video, s_stream, 0);
- if (media_pad_pipeline(pad))
+ if (media_pad_is_streaming(pad))
__media_pipeline_stop(pad);
}
--
2.47.3
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2 3/3] media: imx-csi: use media_pad_is_streaming helper
2025-12-18 9:23 ` [PATCH v2 3/3] media: imx-csi: use media_pad_is_streaming helper Michael Tretter
@ 2025-12-18 15:35 ` Frank Li
0 siblings, 0 replies; 6+ messages in thread
From: Frank Li @ 2025-12-18 15:35 UTC (permalink / raw)
To: Michael Tretter
Cc: Steve Longerbeam, Philipp Zabel, Mauro Carvalho Chehab,
Fabio Estevam, Greg Kroah-Hartman, Shawn Guo, Sascha Hauer,
linux-media, imx, linux-arm-kernel, Pengutronix Kernel Team,
linux-staging
On Thu, Dec 18, 2025 at 10:23:51AM +0100, Michael Tretter wrote:
> The media_pad_is_streaming() helper is explicitly intended to check
> whether a pad has been started with media_pipeline_start(). Use it
> instead of relying on the implicit assumption that a pad with a
> pipeline is streaming.
>
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
---
> Changes in v2:
> - Update commit message as suggested by Frank Li
> ---
> drivers/staging/media/imx/imx-media-utils.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
> index bd9af147a801..1a2e5e40c99c 100644
> --- a/drivers/staging/media/imx/imx-media-utils.c
> +++ b/drivers/staging/media/imx/imx-media-utils.c
> @@ -774,7 +774,7 @@ int imx_media_pipeline_set_stream(struct imx_media_dev *imxmd,
> __media_pipeline_stop(pad);
> } else {
> v4l2_subdev_call(sd, video, s_stream, 0);
> - if (media_pad_pipeline(pad))
> + if (media_pad_is_streaming(pad))
> __media_pipeline_stop(pad);
> }
>
>
> --
> 2.47.3
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start
2025-12-18 9:23 [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start Michael Tretter
` (2 preceding siblings ...)
2025-12-18 9:23 ` [PATCH v2 3/3] media: imx-csi: use media_pad_is_streaming helper Michael Tretter
@ 2026-01-23 16:57 ` Michael Tretter
3 siblings, 0 replies; 6+ messages in thread
From: Michael Tretter @ 2026-01-23 16:57 UTC (permalink / raw)
To: Steve Longerbeam, Philipp Zabel, Frank Li, Mauro Carvalho Chehab,
Fabio Estevam, Greg Kroah-Hartman, Shawn Guo, Sascha Hauer
Cc: linux-media, imx, linux-arm-kernel, Pengutronix Kernel Team,
linux-staging
On Thu, 18 Dec 2025 10:23:48 +0100, Michael Tretter wrote:
> The imx media device currently assumes that there is only a single media
> pipeline. However, the media graph has multiple imx capture devices.
> These may be started separately on media pipelines if they don't cause
> conflicts in the media graph.
>
> Move the media pipeline from the media device to the capture devices to
> properly track and handle multiple media pipelines for the imx-csi.
> Refactor the code to start the media pipeline from the driver to help
> the reader.
Gentle ping.
Michael
>
> Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
> ---
> Changes in v2:
> - Improve code readability in Patch 2
> - Update commit message of Patch 3 as suggested by Frank Li
> - Link to v1: https://patch.msgid.link/20251107-media-imx-cleanup-v1-0-f82a693c28f4@pengutronix.de
>
> ---
> Michael Tretter (3):
> media: imx-csi: move media_pipeline to video device
> media: imx-csi: explicitly start media pipeline on pad 0
> media: imx-csi: use media_pad_is_streaming helper
>
> drivers/staging/media/imx/imx-media-capture.c | 8 ++++----
> drivers/staging/media/imx/imx-media-utils.c | 12 ++++++++----
> drivers/staging/media/imx/imx-media.h | 7 ++++---
> 3 files changed, 16 insertions(+), 11 deletions(-)
> ---
> base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> change-id: 20251107-media-imx-cleanup-9022d941ae44
>
> Best regards,
> --
> Michael Tretter <m.tretter@pengutronix.de>
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
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2025-12-18 9:23 [PATCH v2 0/3] media: imx-csi: cleanup media pipeline start Michael Tretter
2025-12-18 9:23 ` [PATCH v2 1/3] media: imx-csi: move media_pipeline to video device Michael Tretter
2025-12-18 9:23 ` [PATCH v2 2/3] media: imx-csi: explicitly start media pipeline on pad 0 Michael Tretter
2025-12-18 9:23 ` [PATCH v2 3/3] media: imx-csi: use media_pad_is_streaming helper Michael Tretter
2025-12-18 15:35 ` Frank Li
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