linux-kernel - Re: [RFC PATCH v0] Add tw5864 driver

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Date:	Fri, 11 Mar 2016 10:59:02 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Andrey Utkin <andrey.utkin@...p.bluecherry.net>
Cc:	Linux Media <linux-media@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-mentors@...enic.com" <kernel-mentors@...enic.com>,
	devel@...verdev.osuosl.org,
	kernel-janitors <kernel-janitors@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Andrey Utkin <andrey_utkin@...tmail.com>
Subject: Re: [RFC PATCH v0] Add tw5864 driver

On 03/11/2016 09:40 AM, Andrey Utkin wrote:
> On Fri, 11 Mar 2016 09:00:18 +0100
> Hans Verkuil <hverkuil@...all.nl> wrote:
>> The reason is likely to be the tw5864_queue_setup function which has
>> not been updated to handle CREATE_BUFS support correctly. It should
>> look like this:
>>
>> static int tw5864_queue_setup(struct vb2_queue *q,
>> 			      unsigned int *num_buffers,
>> 			      unsigned int *num_planes, unsigned int
>> sizes[], void *alloc_ctxs[])
>> {
>> 	struct tw5864_input *dev = vb2_get_drv_priv(q);
>>
>> 	if (q->num_buffers + *num_buffers < 12)
>> 		*num_buffers = 12 - q->num_buffers;
>>
>> 	alloc_ctxs[0] = dev->alloc_ctx;
>> 	if (*num_planes)
>> 		return sizes[0] < H264_VLC_BUF_SIZE ? -EINVAL : 0;
>>
>> 	sizes[0] = H264_VLC_BUF_SIZE;
>> 	*num_planes = 1;
>>
>> 	return 0;
>> }
> 
> Thanks for suggestion, but now the failure looks this way:
> 
> Streaming ioctls:
>         test read/write: OK
>                 fail: v4l2-test-buffers.cpp(297): g_field() == V4L2_FIELD_ANY

While userspace may specify FIELD_ANY when setting a format, the driver should
always map that to a specific field setting and should never return FIELD_ANY
back to userspace.

In this case, the 'field' field of the v4l2_buffer struct has FIELD_ANY which
means it is not set correctly (or at all) in the driver.

It's a common mistake, which is why v4l2-compliance tests for it :-)

Regards,

	Hans

>                 fail: v4l2-test-buffers.cpp(703): buf.check(q, last_seq)
>                 fail: v4l2-test-buffers.cpp(976): captureBufs(node, q, m2m_q, frame_count, false)
>         test MMAP: FAIL
> 
> Will check that later. If you have any suggestions, I would be very
> grateful.
> --
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