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media: subdev: Add v4l2_subdev_call_state_try() macro

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Add a helper macro for the situations where a non-MC driver needs to
call a state-operation (operation which takes a subdev state as a
parameter) in try-context in another subdev.

The macro allocates a new subdev state for the called subdev and frees
the state afterwards.

An example use case is a media platform driver testing if a
v4l2_subdev_format would be accepted by a source subdev.

This should not be used in MC drivers.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Tomi Valkeinen 2022-07-01 14:15:58 +01:00 committed by Mauro Carvalho Chehab
parent dbae22e200
commit 982c048718
1 changed files with 34 additions and 0 deletions
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34
include/media/v4l2-subdev.h
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@ -1433,6 +1433,40 @@ extern const struct v4l2_subdev_ops v4l2_subdev_call_wrappers;
__result; \
})
/**
* v4l2_subdev_call_state_try - call an operation of a v4l2_subdev which
* takes state as a parameter, passing the
* subdev a newly allocated try state.
*
* @sd: pointer to the &struct v4l2_subdev
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of callbacks functions.
* @f: callback function to be called.
* The callback functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args: arguments for @f.
*
* This is similar to v4l2_subdev_call_state_active(), except that as this
* version allocates a new state, this is only usable for
* V4L2_SUBDEV_FORMAT_TRY use cases.
*
* Note: only legacy non-MC drivers may need this macro.
*/
#define v4l2_subdev_call_state_try(sd, o, f, args...) \
({ \
int __result; \
static struct lock_class_key __key; \
const char *name = KBUILD_BASENAME \
":" __stringify(__LINE__) ":state->lock"; \
struct v4l2_subdev_state *state = \
__v4l2_subdev_state_alloc(sd, name, &__key); \
v4l2_subdev_lock_state(state); \
__result = v4l2_subdev_call(sd, o, f, state, ##args); \
v4l2_subdev_unlock_state(state); \
__v4l2_subdev_state_free(state); \
__result; \
})
/**
* v4l2_subdev_has_op - Checks if a subdev defines a certain operation.
*