Hi Jacopo, Thanks for this work! I'm happy that we finally can get this upstream. I will test and review this in the coming days. As there appears to be a few dependencies to get this to work do you have a branch covering everything needed? On 2024-04-30 12:39:36 +0200, Jacopo Mondi wrote: > Hello this series implements multi-stream support for R-Car CSI-2 and the > two CSI-2 devices that are available on Renesas dev-boards which are mainline > supported (the ADV748x HDMI decoder and the MAX9286 GMSL deserializer). You also need to update the MAX96712 driver in staging else V3U and Gen4 will break. > > The net gain in feature is: > - ADV748x: Select on which MIPI CSI-2 VC to send the stream on > - MAX9286: Paves the way for run-time selection of active links > > Both features are realized by controlling the devices routing tables. > The max9286 routing support is not implemented, but these patches are needed > in order to maintain the current version compatible with R-Car CSI-2. > > The R-Car CSI-2 driver needs to be updated in order to support multiplexed > transmitters, in particular: > > - Use LINK_FREQ to compute the lane bandwidth > - Support subdev_active state > - Configure DT and VC handling by using the remote's frame_desc > > A separate fix for VIN sits at the top of the series to re-enable YUYV capture > operations. > > The series needs to activate streams in v4l2-subdev to work correctly: > > --- a/drivers/media/v4l2-core/v4l2-subdev.c > +++ b/drivers/media/v4l2-core/v4l2-subdev.c > @@ -32,7 +32,7 @@ > * 'v4l2_subdev_enable_streams_api' to 1 below. > */ > > -static bool v4l2_subdev_enable_streams_api; > +static bool v4l2_subdev_enable_streams_api = 1; > #endif I'm not up to date with the latest state of the multiple streams API. Can this be runtime configured or will this break capture if the kernel is not patched to enable this? > > > Test scripts, based on vin-tests are available at: > https://git.uk.ideasonboard.com/jmondi/vin-tests > > A note for Sakari: patch > "media: max9286: Implement support for LINK_FREQ" > > Could actually use your new > "media: v4l: Support passing sub-device argument to v4l2_get_link_freq()" > > I kept it as it is for this version waiting for your patch to get in. I like this idea. > > A note for Niklas: > I think this series paves the way to actually moving the control of which > VC goes to which VIN using a routing table instead of using link enablement. > > Currently the setup is as it follows: routing within R-Car CSI-2 is fixed, sink > stream 0/X goes to source stream X+1/0 and each source pad represents a VC. > Which VC gets sent to which VIN is controlled by link enablement. > > A more natural way of handling this would be to make the routing table > within CSI-2 configurable and have media-links immutable between the CSI-2 > source pad. A CSI-2 source pad would then represent a 'channel' between > CSI-2 and VIN and not the VC which is sent on it. > > This setup would better represent the current implementation, with VIN's VCSEL > fixed channel routing and with the CSI-2 routing table controlling which VC gets > sent on which channel. What do you think ? That could be useful. Maybe we can even switch to use immutable links and use the routing instead greatly simplifying the VIN driver as this together with the other VIN series on the list we can drop the ugly group concept ;-) But this series is already quiet large, I think we can work on this on-top in a new series. > > Jacopo Mondi (19): > media: adv748x: Add support for active state > media: adv748x: Add flags to adv748x_subdev_init() > media: adv748x: Use V4L2 streams > media: adv748x: Propagate format to opposite stream > media: adv748x: Implement set_routing() > media: adv748x: Use routes to configure VC > media: adv748x: Implement .get_frame_desc() > media: max9286: Add support for subdev active state > media: max9286: Fix enum_mbus_code > media: max9286: Use frame interval from subdev state > media: max9286: Use V4L2 Streams > media: max9286: Implement .get_frame_desc() > media: max9286: Implement support for LINK_FREQ > media: max9286: Implement .get_mbus_config() > media: rcar-csi2: Add support for multiplexed streams > media: rcar-csi2: Support multiplexed transmitters > media: rcar-csi2: Store format in the subdev state > media: rcar-csi2: Implement set_routing > media: rcar-vin: Fix YUYV8_1X16 handling for CSI-2 > > drivers/media/i2c/adv748x/adv748x-afe.c | 2 +- > drivers/media/i2c/adv748x/adv748x-core.c | 12 +- > drivers/media/i2c/adv748x/adv748x-csi2.c | 251 +++++++--- > drivers/media/i2c/adv748x/adv748x-hdmi.c | 2 +- > drivers/media/i2c/adv748x/adv748x.h | 4 +- > drivers/media/i2c/max9286.c | 457 ++++++++++++------ > drivers/media/platform/renesas/rcar-csi2.c | 442 ++++++++++++----- > .../platform/renesas/rcar-vin/rcar-dma.c | 16 +- > 8 files changed, 834 insertions(+), 352 deletions(-) > > -- > 2.44.0 > -- Kind Regards, Niklas Söderlund
