On 05/07/2018 07:20 AM, Hans Verkuil wrote:
Steve, Sakari, Any progress on this? The imx7 patch series depends on this so that can't move forward until this is merged.
Hi Hans, I've been working on the updates and will submit v4 today. Steve
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(-)
