From: Milen Mitkov <quic_mmitkov@xxxxxxxxxxx> These patches add support for multiple CSID virtual channels for Qualcomm's SM8250 platform. NOTE: These changes depend on the multistream series that as of yet is still not merged officially upstream. The multistream changes allow for multiple clients on the same pipeline, which is otherwise not possible. For development and testing multistream series v14 was used: https://patchwork.kernel.org/project/linux-media/patch/20220831141357.1396081-2-tomi.valkeinen@xxxxxxxxxxxxxxxx/ The CSID hardware on SM8250 can demux the input data stream into maximum of 4 multiple streams depending on virtual channel (vc) or data type (dt) configuration. Situations in which this is useful: - HDR sensors that produce a 2-frame HDR output, e.g. a light and a dark frame (the setup we used for testing, with the imx412 sensor), or a 3-frame HDR output - light, medium-lit, dark frame. - sensors with additional metadata that is streamed over a different virtual channel/datatype. - sensors that stream frames with multiple resolutions in the same pixel data stream With these changes, the CSID entity has, as it did previously, a single sink port (0), and always exposes 4 source ports (1, 2,3, 4). The virtual channel configuration is determined by which of the source ports are linked to an output VFE line. For example, the link below will configure the CSID driver to enable vc 0 and vc 1: media-ctl -l '"msm_csid0":1->"msm_vfe0_rdi0":0[1]' media-ctl -l '"msm_csid0":2->"msm_vfe0_rdi1":0[1]' which will be demuxed and propagated into /dev/video0 and /dev/video1 respectively. With this, the userspace can use any normal V4L2 client app to start/stop/queue/dequeue from these video nodes. Tested with the yavta app. Note also that implicit format propagation has been removed, so format for the linked source ports has to be set manually, e.g.: media-ctl -V '"msm_csid0":1[fmt:SRGGB10/3840x2160]' media-ctl -V '"msm_csid0":2[fmt:SRGGB10/3840x2160]' Previously setting the format on the sink port of the CSID entity would set the same format on the source port. However, with CSID demuxing there's no guarantee that the format on the source ports should be the same, in fact it can be different for each source port. Milen Mitkov (4): media: camss: sm8250: Virtual channels for CSID media: camss: vfe: Reserve VFE lines on stream start and link to CSID media: camss: vfe-480: Multiple outputs support for SM8250 media: camss: sm8250: Pipeline starting and stopping for multiple virtual channels .../platform/qcom/camss/camss-csid-gen2.c | 55 ++++++++++------- .../media/platform/qcom/camss/camss-csid.c | 41 +++++++------ .../media/platform/qcom/camss/camss-csid.h | 11 +++- .../media/platform/qcom/camss/camss-vfe-480.c | 60 ++++++++++++------- drivers/media/platform/qcom/camss/camss-vfe.c | 7 +++ .../media/platform/qcom/camss/camss-video.c | 21 ++++++- drivers/media/platform/qcom/camss/camss.c | 2 +- 7 files changed, 133 insertions(+), 64 deletions(-) -- 2.37.3
