Re: [PATCH v3][RFC] add raw video stream support for Samsung SUR40

On 21.02.2015 11:22, Hans Verkuil wrote:

On 02/20/2015 10:46 PM, Florian Echtler wrote:

quoted

On 16.02.2015 12:40, Hans Verkuil wrote:

quoted

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?

Thanks & best regards, Florian
-- 
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