Commit 253171a0 authored by Sakari Ailus's avatar Sakari Ailus Committed by Mauro Carvalho Chehab
Browse files

media: v4l: subdev: Add pre_streamon and post_streamoff callbacks 



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: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent 013c35b2

include/media/v4l2-subdev.h

+25 −0
Original line number Diff line number Diff line
@@ -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);

};



/**