On 12/06/18 12:48, Ezequiel Garcia wrote:
> As discussed on IRC, memory-to-memory need to be modeled
> properly in order to be supported by the media controller
> framework, and thus to support the Request API.
>
> This RFC is a first draft on the memory-to-memory
> media controller topology.
>
> The topology looks like this:
>
> Device topology
> - entity 1: input (1 pad, 1 link)
> type Node subtype Unknown flags 0
> pad0: Source
> -> "proc":1 [ENABLED,IMMUTABLE]
>
> - entity 3: proc (2 pads, 2 links)
> type Node subtype Unknown flags 0
> pad0: Source
> -> "output":0 [ENABLED,IMMUTABLE]
> pad1: Sink
> <- "input":0 [ENABLED,IMMUTABLE]
>
> - entity 6: output (1 pad, 1 link)
> type Node subtype Unknown flags 0
> pad0: Sink
> <- "proc":0 [ENABLED,IMMUTABLE]
>
> The first commit introduces a register/unregister API,
> that creates/destroys all the entities and pads needed,
> and links them.
>
> The second commit uses this API to support the vim2m driver.
>
> Notes
> -----
>
> * A new device node type is introduced VFL_TYPE_MEM2MEM,
> this is mostly done so the video4linux core doesn't
> try to register other media controller entities.
There is no need for this. You can check if vfl_dir == VFL_DIR_M2M
instead. I'd rather not add a new VFL_TYPE.
Regards,
Hans
>
> * Also, a new media entity type is introduced. Memory-to-memory
> devices have a multi-entity description and so can't
> be simply embedded in other structs, or cast from other structs.
>
> Ezequiel Garcia (1):
> media: add helpers for memory-to-memory media controller
>
> Hans Verkuil (1):
> vim2m: add media device
>
> drivers/media/platform/vim2m.c | 41 ++++++-
> drivers/media/v4l2-core/v4l2-dev.c | 23 ++--
> drivers/media/v4l2-core/v4l2-mem2mem.c | 157 +++++++++++++++++++++++++
> include/media/media-entity.h | 4 +
> include/media/v4l2-dev.h | 2 +
> include/media/v4l2-mem2mem.h | 5 +
> include/uapi/linux/media.h | 2 +
> 7 files changed, 222 insertions(+), 12 deletions(-)
>
