On 17/09/2024 15:43, Sakari Ailus wrote:
The scope of the s_stream video operation is now fully supported by
{enable,disable}_straems. Explicitly document the s_stream() op as
deprecated and update the related documentation.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
Documentation/driver-api/media/camera-sensor.rst | 8 ++++----
Documentation/driver-api/media/tx-rx.rst | 11 ++++++-----
include/media/v4l2-subdev.h | 5 +++--
3 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/Documentation/driver-api/media/camera-sensor.rst b/Documentation/driver-api/media/camera-sensor.rst
index b4920b34cebc..c290833165e6 100644
--- a/Documentation/driver-api/media/camera-sensor.rst
+++ b/Documentation/driver-api/media/camera-sensor.rst
@@ -81,10 +81,10 @@ restart when the system is resumed. This requires coordination between the
camera sensor and the rest of the camera pipeline. Bridge drivers are
responsible for this coordination, and instruct camera sensors to stop and
restart streaming by calling the appropriate subdev operations
-(``.s_stream()``, ``.enable_streams()`` or ``.disable_streams()``). Camera
-sensor drivers shall therefore **not** keep track of the streaming state to
-stop streaming in the PM suspend handler and restart it in the resume handler.
-Drivers should in general not implement the system PM handlers.
+(``.enable_streams()`` or ``.disable_streams()``). Camera sensor drivers shall
I didn't go through the docs, but I think we need to make it clear
somewhere that v4l2_subdev_enable_streams() and
v4l2_subdev_disable_streams() _must_ be used to enable/disable the
streaming in the source subdevice, and the related subdev callbacks must
not be called directly.
Also, v4l2_subdev_enable_streams() and v4l2_subdev_disable_streams()
kernel doc doesn't seem to clarify that if the driver using those
functions does not support streams, it should use BIT_ULL(1) as the
streams_mask parameter.
Tomi
+therefore **not** keep track of the streaming state to stop streaming in the PM
+suspend handler and restart it in the resume handler. Drivers should in general
+not implement the system PM handlers.
Camera sensor drivers shall **not** implement the subdev ``.s_power()``
operation, as it is deprecated. While this operation is implemented in some
diff --git a/Documentation/driver-api/media/tx-rx.rst b/Documentation/driver-api/media/tx-rx.rst
index 29d66a47b56e..a339df61fca8 100644
--- a/Documentation/driver-api/media/tx-rx.rst
+++ b/Documentation/driver-api/media/tx-rx.rst
@@ -49,11 +49,12 @@ Link frequency
The :ref:`V4L2_CID_LINK_FREQ <v4l2-cid-link-freq>` control is used to tell the
receiver the frequency of the bus (i.e. it is not the same as the symbol rate).
-``.s_stream()`` callback
-^^^^^^^^^^^^^^^^^^^^^^^^
+``.enable_streams()`` and ``.disable_streams()`` callbacks
+^^^^^^^^^^^^^^^^^^^^^^^^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-The struct struct v4l2_subdev_video_ops->s_stream() callback is used by the
-receiver driver to control the transmitter driver's streaming state.
+The struct v4l2_subdev_pad_ops->enable_streams() and struct
+v4l2_subdev_pad_ops->disable_streams() callbacks are used by the receiver driver
+to control the transmitter driver's streaming state.
CSI-2 transmitter drivers
@@ -127,7 +128,7 @@ Stopping the transmitter
^^^^^^^^^^^^^^^^^^^^^^^^
A transmitter stops sending the stream of images as a result of
-calling the ``.s_stream()`` callback. Some transmitters may stop the
+calling the ``.disable_streams()`` callback. Some transmitters may stop the
stream at a frame boundary whereas others stop immediately,
effectively leaving the current frame unfinished. The receiver driver
should not make assumptions either way, but function properly in both
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 8daa0929865c..3cc6b4a5935f 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -450,8 +450,9 @@ enum v4l2_subdev_pre_streamon_flags {
* already started or stopped subdev. Also see call_s_stream wrapper in
* v4l2-subdev.c.
*
- * New drivers should instead implement &v4l2_subdev_pad_ops.enable_streams
- * and &v4l2_subdev_pad_ops.disable_streams operations, and use
+ * This callback is DEPRECATED. New drivers should instead implement
+ * &v4l2_subdev_pad_ops.enable_streams and
+ * &v4l2_subdev_pad_ops.disable_streams operations, and use
* v4l2_subdev_s_stream_helper for the &v4l2_subdev_video_ops.s_stream
* operation to support legacy users.
*
