On 13/09/17 17:49, Dave Stevenson wrote:
> OV5647
>
> v4l2-compliance SHA : f6ecbc90656815d91dc6ba90aac0ad8193a14b38
>
> Driver Info:
> Driver name : unicam
> Card type : unicam
> Bus info : platform:unicam 3f801000.csi1
> Driver version: 4.13.0
> Capabilities : 0x85200001
> Video Capture
> Read/Write
> Streaming
> Extended Pix Format
> Device Capabilities
> Device Caps : 0x05200001
> Video Capture
> Read/Write
> Streaming
> Extended Pix Format
>
> Compliance test for device /dev/video0 (not using libv4l2):
>
> Required ioctls:
> test VIDIOC_QUERYCAP: OK
>
> Allow for multiple opens:
> test second video open: OK
> test VIDIOC_QUERYCAP: OK
> test VIDIOC_G/S_PRIORITY: OK
> test for unlimited opens: OK
>
> Debug ioctls:
> test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported)
> test VIDIOC_LOG_STATUS: OK
>
> Input ioctls:
> test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)
> test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
> test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)
> test VIDIOC_ENUMAUDIO: OK (Not Supported)
> test VIDIOC_G/S/ENUMINPUT: OK
> test VIDIOC_G/S_AUDIO: OK (Not Supported)
> Inputs: 1 Audio Inputs: 0 Tuners: 0
>
> Output ioctls:
> test VIDIOC_G/S_MODULATOR: OK (Not Supported)
> test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
> test VIDIOC_ENUMAUDOUT: OK (Not Supported)
> test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)
> test VIDIOC_G/S_AUDOUT: OK (Not Supported)
> Outputs: 0 Audio Outputs: 0 Modulators: 0
>
> Input/Output configuration ioctls:
> test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)
> test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)
> test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)
> test VIDIOC_G/S_EDID: OK (Not Supported)
>
> Test input 0:
>
> Control ioctls:
> test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
> test VIDIOC_QUERYCTRL: OK
> test VIDIOC_G/S_CTRL: OK
> fail: v4l2-test-controls.cpp(587): g_ext_ctrls does not
> support count == 0
Huh. The issue here is that there are no controls at all, but the
control API is present. The class_check() function in v4l2-ctrls.c expects
that there are controls and if not it returns -EINVAL, causing this test
to fail.
Try to apply this patch:
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index dd1db678718c..4e53a8654690 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -2818,7 +2818,7 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
{
if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
- return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
+ return 0;
return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
}
and see if it will pass the compliance test. There may be other issues.
I think that the compliance test should handle the case where there are no
controls, so this is a good test.
That said, another solution is that the driver detects that there are no
controls in unicam_probe_complete() and sets unicam->v4l2_dev.ctrl_handler
to NULL.
I think you should do this in v4. Having control ioctls but no actual controls
is not wrong as such, but it is a bit misleading towards the application.
But let's make sure that v4l2-compliance can handle this case first.
Regards,
Hans
