On 22-07-15 00:21:29, Kieran Bingham wrote:
>
> As I understand it - it shouldn't be happening, so I suspect it's something in
> your CSI2 receiver driver initialising some defaults perhaps.
I've attached 'media-ctl -p' output for clarity. This is imx8m-mini based board
on 5.19.0-rc6.
When selecting a test pattern with:
v4l2-ctl -d /dev/v4l-subdev2 --set-ctrl=test_pattern=2
I get this from v4l2-ctl:
VIDIOC_S_EXT_CTRLS: failed: Invalid argument
test_pattern: Invalid argument
but the fun part is that my .s_ctrl() routine receives V4L2_CID_TEST_PATTERN and
ctrl->val is indeed 2, hence i'm setting sensor registers according to this
data.
I (falsely) assumed this would be a 'sticky' attribute so when i ask the
receiver driver (/dev/video0) to start streaming, it wouldn't change the test
pattern value under my feet. Instead the imx492 driver once again receive
V4L2_CID_TEST_PATTERN, this time with ctrl->val == 0, which kind of ruins all
the fun.
Following you advice, i tried to find which CSI2 driver might be the culprit.
None of the relevant drivers in drivers/staging/media/imx have v4l2_ctrl_ops
callback registered. If that's what i am supposed to look for, which now seems
unlikely.
Do you have other recommendations about what (and where) should i look next?
Petko
Media controller API version 5.19.0
Media device information
------------------------
driver imx7-csi
model imx-media
serial
bus info platform:32e20000.csi
hw revision 0x0
driver version 5.19.0
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:SGBRG12_1X12/8192x4320 field:none colorspace:raw xfer:none ycbcr:601 quantization:full-range]
<- "csis-32e30000.mipi-csi":1 [ENABLED,IMMUTABLE]
pad1: Source
[fmt:SGBRG12_1X12/8192x4320 field:none colorspace:raw xfer:none ycbcr:601 quantization:full-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: csis-32e30000.mipi-csi (2 pads, 2 links)
type V4L2 subdev subtype Unknown flags 0
device node name /dev/v4l-subdev1
pad0: Sink
[fmt:SGBRG12_1X12/8192x4320 field:none colorspace:raw]
<- "imx492 1-0010":0 [ENABLED]
pad1: Source
[fmt:SGBRG12_1X12/8192x4320 field:none colorspace:raw]
-> "csi":0 [ENABLED,IMMUTABLE]
- entity 15: imx492 1-0010 (1 pad, 1 link)
type V4L2 subdev subtype Sensor flags 0
device node name /dev/v4l-subdev2
pad0: Source
[fmt:SGBRG12_1X12/8192x4320 field:none colorspace:raw xfer:none]
-> "csis-32e30000.mipi-csi":0 [ENABLED]
