Steve, Sakari, Any progress on this? The imx7 patch series depends on this so that can't move forward until this is merged. Regards, Hans On 21/03/18 01:37, Steve Longerbeam wrote: > This patchset converts the imx-media driver and its dependent > subdevs to use subdev notifiers. > > There are a couple shortcomings in v4l2-core that prevented > subdev notifiers from working correctly in imx-media: > > 1. v4l2_async_notifier_fwnode_parse_endpoint() treats a fwnode > endpoint that is not connected to a remote device as an error. > But in the case of the video-mux subdev, this is not an error, > it is OK if some of the mux inputs have no connection. Also, > Documentation/devicetree/bindings/media/video-interfaces.txt explicitly > states that the 'remote-endpoint' property is optional. So the first > patch is a small modification to ignore empty endpoints in > v4l2_async_notifier_fwnode_parse_endpoint() and allow > __v4l2_async_notifier_parse_fwnode_endpoints() to continue to > parse the remaining port endpoints of the device. > > 2. In the imx-media graph, multiple subdevs will encounter the same > upstream subdev (such as the imx6-mipi-csi2 receiver), and so > v4l2_async_notifier_parse_fwnode_endpoints() will add imx6-mipi-csi2 > multiple times. This is treated as an error by > v4l2_async_notifier_register() later. > > To get around this problem, add an v4l2_async_notifier_add_subdev() > which first verifies the provided asd does not already exist in the > given notifier asd list or in other registered notifiers. If the asd > exists, the function returns -EEXIST and it's up to the caller to > decide if that is an error (in imx-media case it is never an error). > > Patches 2-4 deal with adding that support. > > 3. Patch 5 adds v4l2_async_register_fwnode_subdev(), which is a > convenience function for parsing a subdev's fwnode port endpoints > for connected remote subdevs, registering a subdev notifier, and > then registering the sub-device itself. > > The remaining patches update the subdev drivers to register a > subdev notifier with endpoint parsing, and the changes to imx-media > to support that. > > Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx> > Acked-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> > > History: > v3: > - code optimization in asd_equal(), and remove unneeded braces, > suggested by Sakari Ailus. > - add a NULL asd pointer check to v4l2_async_notifier_asd_valid(). > - fix an error-out path in v4l2_async_register_fwnode_subdev() that > forgot to put device. > > v2: > - don't pass an empty endpoint to the parse_endpoint callback, > v4l2_async_notifier_fwnode_parse_endpoint() now just ignores them > and returns success. > - Fix a couple compile warnings and errors seen in i386 and sh archs. > > > Steve Longerbeam (13): > media: v4l2-fwnode: ignore endpoints that have no remote port parent > media: v4l2: async: Allow searching for asd of any type > media: v4l2: async: Add v4l2_async_notifier_add_subdev > media: v4l2-fwnode: Switch to v4l2_async_notifier_add_subdev > media: v4l2-fwnode: Add a convenience function for registering subdevs > with notifiers > media: platform: video-mux: Register a subdev notifier > media: imx: csi: Register a subdev notifier > media: imx: mipi csi-2: Register a subdev notifier > media: staging/imx: of: Remove recursive graph walk > media: staging/imx: Loop through all registered subdevs for media > links > media: staging/imx: Rename root notifier > media: staging/imx: Switch to v4l2_async_notifier_add_subdev > media: staging/imx: TODO: Remove one assumption about OF graph parsing > > drivers/media/pci/intel/ipu3/ipu3-cio2.c | 10 +- > drivers/media/platform/video-mux.c | 36 ++- > drivers/media/v4l2-core/v4l2-async.c | 268 ++++++++++++++++------ > drivers/media/v4l2-core/v4l2-fwnode.c | 231 +++++++++++-------- > drivers/staging/media/imx/TODO | 29 +-- > drivers/staging/media/imx/imx-media-csi.c | 11 +- > drivers/staging/media/imx/imx-media-dev.c | 134 +++-------- > drivers/staging/media/imx/imx-media-internal-sd.c | 5 +- > drivers/staging/media/imx/imx-media-of.c | 106 +-------- > drivers/staging/media/imx/imx-media.h | 6 +- > drivers/staging/media/imx/imx6-mipi-csi2.c | 31 ++- > include/media/v4l2-async.h | 24 +- > include/media/v4l2-fwnode.h | 65 +++++- > 13 files changed, 534 insertions(+), 422 deletions(-) >
