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.
Adam Ford (5):
arm64: dts: imx8mm: Add CSI nodes
arm64: defconfig: Enable VIDEO_IMX_MEDIA
arm64: dts: imx8mm-beacon: Enable OV5640 Camera
arm64: defconfig: Enable OV5640
arm64: dts: imx8mm-evk: Enable OV5640 Camera
.../freescale/imx8mm-beacon-baseboard.dtsi | 55 +++++++++++++++++++
arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 44 +++++++++++++++
arch/arm64/boot/dts/freescale/imx8mm.dtsi | 55 +++++++++++++++++++
arch/arm64/configs/defconfig | 2 +
4 files changed, 156 insertions(+)
--
2.25.1
