Hi Adam, [Adding Frieder on Cc] On Sat, Oct 23, 2021 at 5:35 PM Adam Ford <aford173@xxxxxxxxx> wrote: > > The imx8mm appears to have both a CSI bridge and mipi-csi-2 drivers. With > those enabled, both the imx8mm-evk and imx8mm-beacon boards should be able > use an OV5640 camera. > > The mipi-csi2 driver sets the clock frequency to 333MHz, so the clock parent > of the CSI1 must be reparented to a faster clock. On the custom NXP kernel, > they use IMX8MM_SYS_PLL2_1000M, so that is done in the device tree to match. > > With the CSI and mipi_csi2 drivers pointing to an OV5640 camera, the media > pipeline can be configured with the following: > > media-ctl --links "'ov5640 1-003c':0->'imx7-mipi-csis.0':0[1]" > > The camera and various nodes in the pipeline can be configured for UYVY: > media-ctl -v -V "'ov5640 1-003c':0 [fmt:UYVY8_1X16/640x480 field:none]" > media-ctl -v -V "'csi':0 [fmt:UYVY8_1X16/640x480 field:none]" > > With that, the media pipeline looks like: > > > Media controller API version 5.15.0 > > Media device information > ------------------------ > driver imx7-csi > model imx-media > serial > bus info platform:32e20000.csi > hw revision 0x0 > driver version 5.15.0 > > Device topology > - entity 1: csi (2 pads, 2 links) > type V4L2 subdev subtype Unknown flags 0 > device node name /dev/v4l-subdev0 > pad0: Sink > [fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range] > <- "imx7-mipi-csis.0":1 [ENABLED,IMMUTABLE] > pad1: Source > [fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range] > -> "csi capture":0 [ENABLED,IMMUTABLE] > > - entity 4: csi capture (1 pad, 1 link) > type Node subtype V4L flags 0 > device node name /dev/video0 > pad0: Sink > <- "csi":1 [ENABLED,IMMUTABLE] > > - entity 10: imx7-mipi-csis.0 (2 pads, 2 links) > type V4L2 subdev subtype Unknown flags 0 > device node name /dev/v4l-subdev1 > pad0: Sink > [fmt:UYVY8_1X16/640x480 field:none colorspace:smpte170m xfer:709 ycbcr:601 quantization:lim-range] > <- "ov5640 1-003c":0 [ENABLED] > pad1: Source > [fmt:UYVY8_1X16/640x480 field:none colorspace:smpte170m xfer:709 ycbcr:601 quantization:lim-range] > -> "csi":0 [ENABLED,IMMUTABLE] > > - entity 15: ov5640 1-003c (1 pad, 1 link) > type V4L2 subdev subtype Sensor flags 0 > device node name /dev/v4l-subdev2 > pad0: Source > [fmt:UYVY8_1X16/640x480@1/30 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range] > -> "imx7-mipi-csis.0":0 [ENABLED] > > When configured, gstreamer can be used to capture 1 frame and store it to a file. > > gst-launch-1.0 -v v4l2src num-buffers=1 ! video/x-raw,format=UYVY,width=640,height=480,framerate=60/1 ! filesink location=test > > Unfortunately, the video capture never appears to happen. No errors occur, not > interrupts are recorded and no errors are recorded. > > gst-launch-1.0 -v v4l2src num-buffers=1 ! video/x-raw,format=UYVY,width=640,height=480,framerate=60/1 ! filesink location=test > Setting pipeline to PAUSED ... > Pipeline is live and does not need PREROLL ... > Pipeline is PREROLLED ... > Setting pipeline to [ 114.819632] v4l2_get_link_freq: Link frequency estimated using pixel rate: result might be inaccurate > PLAYING ... > New clock: GstSystem[ 114.829203] v4l2_get_link_freq: Consider implementing support for V4L2_CID_LINK_FREQ in the transmitter driver > Clock > /GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = video/x-raw, format=(string)UYVY, width=(int)640, height=(int)480, framerate=(fraction)60/1, interlace-mode=(string)progressive, colorimetry=(string)bt709 > /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-raw, format=(string)UYVY, width=(int)640, height=(int)480, framerate=(fraction)60/1, interlace-mode=(string)progressive, colorimetry=(string)bt709 > /GstPipeline:pipeline0/GstFileSink:filesink0.GstPad:sink: caps = video/x-raw, format=(string)UYVY, width=(int)640, height=(int)480, framerate=(fraction)60/1, interlace-mode=(string)progressive, colorimetry=(string)bt709 > /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = video/x-raw, format=(string)UYVY, width=(int)640, height=(int)480, framerate=(fraction)60/1, interlace-mode=(string)progressive, colorimetry=(string)bt709 > > > If anyone has any insight as to what might be wrong, I'd like feedback. > I posted a device tree that I beleive goes with the newer imx8mm-evk, but > I do not have this hardware, so I cannot test it. It seems that Frieder on Cc managed to get camera capture to work on i.MX8MM here: https://git.kontron-electronics.de/sw/misc/linux/-/commits/v5.10-mx8mm-csi Hopefully, this can help to figure out what is missing in mainline to get camera capture to work on i.MX8M. I don't have access to an OV5640 camera to connect to the imx8mm-evk board to try your series. Regards, Fabio Estevam
