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media: v4l: subdev: Add pre_streamon and post_streamoff callbacks

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Add pre_streamon and post_streamoff callbacks that can be used to set a
CSI-2 transmitter to LP-11 or LP-111 mode. This can be used by receiver
drivers to reliably initialise the receiver when its initialisation
requires software involvement.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sakari Ailus 2021-06-23 14:44:28 +02:00 committed by Mauro Carvalho Chehab
parent 013c35b22e
commit 253171a0da
1 changed files with 25 additions and 0 deletions
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25
include/media/v4l2-subdev.h
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@ -354,6 +354,16 @@ struct v4l2_mbus_frame_desc {
unsigned short num_entries;
};
/**
* enum v4l2_subdev_pre_streamon_flags - Flags for pre_streamon subdev core op
*
* @V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP: Set the transmitter to either LP-11
* or LP-111 mode before call to s_stream().
*/
enum v4l2_subdev_pre_streamon_flags {
V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP = BIT(0),
};
/**
* struct v4l2_subdev_video_ops - Callbacks used when v4l device was opened
* in video mode.
@ -409,6 +419,19 @@ struct v4l2_mbus_frame_desc {
* @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
* can adjust @size to a lower value and must not write more data to the
* buffer starting at @data than the original value of @size.
*
* @pre_streamon: May be called before streaming is actually started, to help
* initialising the bus. Current usage is to set a CSI-2 transmitter to
* LP-11 or LP-111 mode before streaming. See &enum
* v4l2_subdev_pre_streamon_flags.
*
* pre_streamon shall return error if it cannot perform the operation as
* indicated by the flags argument. In particular, -EACCES indicates lack
* of support for the operation. The caller shall call post_streamoff for
* each successful call of pre_streamon.
*
* @post_streamoff: Called after streaming is stopped, but if and only if
* pre_streamon was called earlier.
*/
struct v4l2_subdev_video_ops {
int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
@ -435,6 +458,8 @@ struct v4l2_subdev_video_ops {
struct v4l2_dv_timings *timings);
int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
unsigned int *size);
int (*pre_streamon)(struct v4l2_subdev *sd, u32 flags);
int (*post_streamoff)(struct v4l2_subdev *sd);
};
/**