On 03/06/2015 12:24 PM, Florian Echtler wrote: > On 21.02.2015 11:22, Hans Verkuil wrote: >> On 02/20/2015 10:46 PM, Florian Echtler wrote: >>> On 16.02.2015 12:40, Hans Verkuil wrote: >>>> On 02/11/2015 12:52 PM, Florian Echtler wrote: >>>> I prefer to dig into this a little bit more, as I don't really understand >>>> it. Set the videobuf2-core debug level to 1 and see what the warnings are. >>>> Since 'buf.qbuf' fails in v4l2-compliance, it's something in the VIDIOC_QBUF >>>> sequence that returns an error, so you need to pinpoint that. >>> OK, I don't currently have access to the hardware, but I will try this >>> as soon as possible. > Finally got a chance to try again with videobuf2-core.debug=1. Same > result on 3.19 and 4.0-rc2, after running v4l2-compliance -s from > today's master (full log attached, but important part is below): > > [11470.040067] vb2: __vb2_queue_alloc: allocated 3 buffers, 1 plane(s) each > [11470.040136] vb2: vb2_mmap: queue is not currently set up for mmap > [11470.040158] vb2: __qbuf_userptr: failed acquiring userspace memory > for plane 0 > [11470.040163] vb2: __buf_prepare: buffer preparation failed: -22 > [11470.040172] vb2: __qbuf_userptr: failed acquiring userspace memory > for plane 0 > [11470.040175] vb2: __buf_prepare: buffer preparation failed: -22 > [11470.040651] vb2: vb2_internal_qbuf: qbuf of buffer 0 succeeded > [11470.040663] vb2: vb2_mmap: queue is not currently set up for mmap > [11470.040676] vb2: __qbuf_userptr: failed acquiring userspace memory > for plane 0 > [11470.040680] vb2: __buf_prepare: buffer preparation failed: -22 > [11470.040687] vb2: __qbuf_userptr: failed acquiring userspace memory > for plane 0 > [11470.040690] vb2: __buf_prepare: buffer preparation failed: -22 > [11470.041167] vb2: vb2_internal_qbuf: qbuf of buffer 1 succeeded > [11470.041178] vb2: vb2_mmap: queue is not currently set up for mmap > [11470.041193] vb2: __qbuf_userptr: failed acquiring userspace memory > for plane 0 > [11470.041196] vb2: __buf_prepare: buffer preparation failed: -22 > [11470.041203] vb2: __qbuf_userptr: failed acquiring userspace memory > for plane 0 > [11470.041207] vb2: __buf_prepare: buffer preparation failed: -22 > [11470.041683] vb2: vb2_internal_qbuf: qbuf of buffer 2 succeeded > [11470.051195] sur40 2-1:1.0: error in usb_sg_wait > [11470.051250] vb2: vb2_internal_dqbuf: dqbuf of buffer 0, with state 0 > > I'm not familiar enough with the inner workings of videobuf2 to make any > sense of it, any new insights from you guys? Can you do: echo 2 >/sys/class/video4linux/videoX/dev_debug and run again? That way I see the vb2 debug messages in related to the issued ioctls. And if you can also supply the v4l2-compliance -s output, just for reference? Thanks, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
