Re: [PATCH 31/75] media: imx: capture: Support creating immutable link to capture device
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: 2021-01-09 00:50:01
Subsystem:
media drivers for freescale imx, media input infrastructure (v4l/dvb), staging subsystem, the rest · Maintainers:
Steve Longerbeam, Philipp Zabel, Mauro Carvalho Chehab, Greg Kroah-Hartman, Linus Torvalds
Hi Ezequiel, On Fri, Jan 08, 2021 at 02:37:54PM -0300, Ezequiel Garcia wrote:
Hi Laurent, On Tue, 2021-01-05 at 17:28 +0200, Laurent Pinchart wrote:quoted
When the subdevice connected to the capture device has a single possible sink, there's no point in making the link mutable. Support creating immutable links.Does this apply to csi2_notify_bound as welll that is, is there any point in making the sensor link mutable?
We could have multiple sensors connected to the same CSI-2 receiver, with all but one always in reset (not a recommended hardware design, but it has been done and can work in some cases).
quoted
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> --- drivers/staging/media/imx/imx-ic-prpencvf.c | 2 +- drivers/staging/media/imx/imx-media-capture.c | 7 +++++-- drivers/staging/media/imx/imx-media-csi.c | 2 +- drivers/staging/media/imx/imx-media.h | 3 ++- drivers/staging/media/imx/imx7-media-csi.c | 2 +- 5 files changed, 10 insertions(+), 6 deletions(-)diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c index 88d69425e1b3..6c9c75ffb30c 100644 --- a/drivers/staging/media/imx/imx-ic-prpencvf.c +++ b/drivers/staging/media/imx/imx-ic-prpencvf.c@@ -1269,7 +1269,7 @@ static int prp_registered(struct v4l2_subdev *sd)if (IS_ERR(priv->vdev)) return PTR_ERR(priv->vdev); - ret = imx_media_capture_device_register(priv->vdev); + ret = imx_media_capture_device_register(priv->vdev, false);Maybe it's just me, but I dislike this boolean parameter pattern, as opposed to passing the flags directly, or some other MUTABLE/IMMUTABLE enum value.
Something along these lines ?
diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index 88d69425e1b3..d990553de87b 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c@@ -1269,7 +1269,7 @@ static int prp_registered(struct v4l2_subdev *sd) if (IS_ERR(priv->vdev)) return PTR_ERR(priv->vdev); - ret = imx_media_capture_device_register(priv->vdev); + ret = imx_media_capture_device_register(priv->vdev, 0); if (ret) goto remove_vdev;
diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index 04eb612ff1fa..a17e087a0d02 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c@@ -898,7 +898,9 @@ static int capture_init_format(struct capture_priv *priv) return 0; } -int imx_media_capture_device_register(struct imx_media_video_dev *vdev) +int imx_media_capture_device_register(struct imx_media_video_dev *vdev, + u32 link_flags) + bool immutable) { struct capture_priv *priv = to_capture_priv(vdev); struct v4l2_subdev *sd = priv->src_sd;
@@ -927,8 +929,10 @@ int imx_media_capture_device_register(struct imx_media_video_dev *vdev) video_device_node_name(vfd)); /* Create the link from the src_sd devnode pad to device node. */ + if (link_flags & MEDIA_LNK_FL_IMMUTABLE) + link_flags |= MEDIA_LNK_FL_ENABLED; ret = media_create_pad_link(&sd->entity, priv->src_sd_pad, - &vfd->entity, 0, 0); + &vfd->entity, 0, link_flags); if (ret) { dev_err(priv->dev, "failed to create link to device node\n"); video_unregister_device(vfd);
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index cfad000d9352..ce64f3da81f7 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c@@ -1788,7 +1788,7 @@ static int csi_registered(struct v4l2_subdev *sd) goto free_fim; } - ret = imx_media_capture_device_register(priv->vdev); + ret = imx_media_capture_device_register(priv->vdev, 0); if (ret) goto remove_vdev;
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index 2ea2e62ddf86..492d9a64e704 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h@@ -288,7 +288,8 @@ struct imx_media_video_dev * imx_media_capture_device_init(struct device *dev, struct v4l2_subdev *src_sd, int pad, bool legacy_api); void imx_media_capture_device_remove(struct imx_media_video_dev *vdev); -int imx_media_capture_device_register(struct imx_media_video_dev *vdev); +int imx_media_capture_device_register(struct imx_media_video_dev *vdev, + u32 link_flags); void imx_media_capture_device_unregister(struct imx_media_video_dev *vdev); struct imx_media_buffer * imx_media_capture_device_next_buf(struct imx_media_video_dev *vdev);
diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index afd1a7e35bfe..1b13347bd0a0 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c@@ -1093,7 +1093,7 @@ static int imx7_csi_registered(struct v4l2_subdev *sd) if (IS_ERR(csi->vdev)) return PTR_ERR(csi->vdev); - ret = imx_media_capture_device_register(csi->vdev); + ret = imx_media_capture_device_register(csi->vdev, 0); if (ret) imx_media_capture_device_remove(csi->vdev);
--
Regards,
Laurent Pinchart