Message-Id: <20170822155128.96b41ae545d4fbd010b266fc@magewell.com>
Date:   Tue, 22 Aug 2017 15:51:28 +0800
From:   Yong <yong.deng@...ewell.com>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     maxime.ripard@...e-electrons.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Hugues Fruchet <hugues.fruchet@...com>,
        Yannick Fertre <yannick.fertre@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Benoit Parrot <bparrot@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Jean-Christophe Trotin <jean-christophe.trotin@...com>,
        Ramesh Shanmugasundaram <ramesh.shanmugasundaram@...renesas.com>,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 1/3] media: V3s: Add support for Allwinner CSI.

On Tue, 22 Aug 2017 08:43:35 +0200
Hans Verkuil <hverkuil@...all.nl> wrote:

> On 08/22/2017 05:01 AM, Yong wrote:
> > Hi Hans,
> > 
> > On Mon, 21 Aug 2017 16:37:41 +0200
> > Hans Verkuil <hverkuil@...all.nl> wrote:
> > 
> >> Hi Yong,
> >>
> >> First two high-level comments before I start the review:
> >>
> >> 1) Can you provide the v4l2-compliance output? I can't merge this unless I
> >>    see that it passes the compliance tests. Make sure you compile from the git
> >>    repo (https://git.linuxtv.org/v4l-utils.git/) so you are using the latest
> >>    version of the compliance test. Test with just 'v4l2-compliance' and also
> >>    with the -s option (to test streaming) and with the -f option (to test all
> >>    the various pixel formats).
> > 
> > OK. I will post with the next version.
> > 
> >>
> >> 2) I see you support interlaced formats. Did you actually test that? Interlaced
> >>    is tricky and you shouldn't add support for it unless you know it works and
> >>    that it passes the 'v4l2-compliance -s' test.
> > 
> > No. I do not have the condition to test the all formats for now. Maybe this can 
> > be done when ourself's device with V3s is ready in the future months.
> 
> Then just drop the interlaced support until you can test it.

OK. I will try to find a way to test it. If not, I will drop it.

> 
> > 
> >>
> >> On 07/27/2017 07:01 AM, Yong Deng wrote:
> >>> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> >>> and CSI1 is used for parallel interface. This is not documented in
> >>> datasheet but by testing and guess.
> >>>
> >>> This patch implement a v4l2 framework driver for it.
> >>>
> >>> Currently, the driver only support the parallel interface. MIPI-CSI2,
> >>> ISP's support are not included in this patch.
> >>>
> >>> Signed-off-by: Yong Deng <yong.deng@...ewell.com>
> >>> ---
> >>>  drivers/media/platform/Kconfig                   |   1 +
> >>>  drivers/media/platform/Makefile                  |   2 +
> >>>  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
> >>>  drivers/media/platform/sun6i-csi/Makefile        |   3 +
> >>>  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545 +++++++++++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_csi.h     | 203 ++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827 +++++++++++++++++++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_video.c   | 663 ++++++++++++++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_video.h   |  61 ++
> >>>  10 files changed, 2520 insertions(+)
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/Kconfig
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/Makefile
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.c
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.h
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.c
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.h
> >>>
> >>
> >> <snip>
> >>
> >>> diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.c b/drivers/media/platform/sun6i-csi/sun6i_video.c
> >>> new file mode 100644
> >>> index 0000000..0c5dbd2
> >>> --- /dev/null
> >>> +++ b/drivers/media/platform/sun6i-csi/sun6i_video.c
> >>> @@ -0,0 +1,663 @@
> >>> +/*
> >>> + * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing).
> >>> + * All rights reserved.
> >>> + * Author: Yong Deng <yong.deng@...ewell.com>
> >>> + *
> >>> + * This program is free software; you can redistribute it and/or modify
> >>> + * it under the terms of the GNU General Public License version 2 as
> >>> + * published by the Free Software Foundation.
> >>> + *
> >>> + * This program is distributed in the hope that it will be useful,
> >>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>> + * GNU General Public License for more details.
> >>> + */
> >>> +
> >>> +#include <linux/of.h>
> >>> +
> >>> +#include <media/v4l2-device.h>
> >>> +#include <media/v4l2-ioctl.h>
> >>> +#include <media/v4l2-mc.h>
> >>> +#include <media/videobuf2-dma-contig.h>
> >>> +#include <media/videobuf2-v4l2.h>
> >>> +
> >>> +#include "sun6i_csi.h"
> >>> +#include "sun6i_video.h"
> >>> +
> >>> +struct sun6i_csi_buffer {
> >>> +	struct vb2_v4l2_buffer		vb;
> >>> +	struct list_head		list;
> >>> +
> >>> +	dma_addr_t			dma_addr;
> >>> +};
> >>> +
> >>> +static struct sun6i_csi_format *
> >>> +find_format_by_fourcc(struct sun6i_video *video, unsigned int fourcc)
> >>> +{
> >>> +	unsigned int num_formats = video->num_formats;
> >>> +	struct sun6i_csi_format *fmt;
> >>> +	unsigned int i;
> >>> +
> >>> +	for (i = 0; i < num_formats; i++) {
> >>> +		fmt = &video->formats[i];
> >>> +		if (fmt->fourcc == fourcc)
> >>> +			return fmt;
> >>> +	}
> >>> +
> >>> +	return NULL;
> >>> +}
> >>> +
> >>> +static struct v4l2_subdev *
> >>> +sun6i_video_remote_subdev(struct sun6i_video *video, u32 *pad)
> >>> +{
> >>> +	struct media_pad *remote;
> >>> +
> >>> +	remote = media_entity_remote_pad(&video->pad);
> >>> +
> >>> +	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
> >>> +		return NULL;
> >>> +
> >>> +	if (pad)
> >>> +		*pad = remote->index;
> >>> +
> >>> +	return media_entity_to_v4l2_subdev(remote->entity);
> >>> +}
> >>> +
> >>> +static int sun6i_video_queue_setup(struct vb2_queue *vq,
> >>> +				 unsigned int *nbuffers, unsigned int *nplanes,
> >>> +				 unsigned int sizes[],
> >>> +				 struct device *alloc_devs[])
> >>> +{
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> >>> +	unsigned int size = video->fmt.fmt.pix.sizeimage;
> >>> +
> >>> +	if (*nplanes)
> >>> +		return sizes[0] < size ? -EINVAL : 0;
> >>> +
> >>> +	*nplanes = 1;
> >>> +	sizes[0] = size;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_buffer_prepare(struct vb2_buffer *vb)
> >>> +{
> >>> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> >>> +	struct sun6i_csi_buffer *buf =
> >>> +			container_of(vbuf, struct sun6i_csi_buffer, vb);
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> >>> +	unsigned long size = video->fmt.fmt.pix.sizeimage;
> >>> +
> >>> +	if (vb2_plane_size(vb, 0) < size) {
> >>> +		v4l2_err(video->vdev.v4l2_dev, "buffer too small (%lu < %lu)\n",
> >>> +			 vb2_plane_size(vb, 0), size);
> >>> +		return -EINVAL;
> >>> +	}
> >>> +
> >>> +	vb2_set_plane_payload(vb, 0, size);
> >>> +
> >>> +	buf->dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
> >>> +
> >>> +	vbuf->field = video->fmt.fmt.pix.field;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_pipeline_set_stream(struct sun6i_video *video, bool enable)
> >>> +{
> >>> +	struct media_entity *entity;
> >>> +	struct media_pad *pad;
> >>> +	struct v4l2_subdev *subdev;
> >>> +	int ret;
> >>> +
> >>> +	entity = &video->vdev.entity;
> >>> +	while (1) {
> >>> +		pad = &entity->pads[0];
> >>> +		if (!(pad->flags & MEDIA_PAD_FL_SINK))
> >>> +			break;
> >>> +
> >>> +		pad = media_entity_remote_pad(pad);
> >>> +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
> >>> +			break;
> >>> +
> >>> +		entity = pad->entity;
> >>> +		subdev = media_entity_to_v4l2_subdev(entity);
> >>> +
> >>> +		ret = v4l2_subdev_call(subdev, video, s_stream, enable);
> >>> +		if (enable && ret < 0 && ret != -ENOIOCTLCMD)
> >>> +			return ret;
> >>> +	}
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_start_streaming(struct vb2_queue *vq, unsigned int count)
> >>> +{
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> >>> +	struct sun6i_csi_buffer *buf;
> >>> +	struct sun6i_csi_config config;
> >>> +	unsigned long flags;
> >>> +	int ret;
> >>> +
> >>> +	video->sequence = 0;
> >>> +
> >>> +	ret = media_pipeline_start(&video->vdev.entity, &video->vdev.pipe);
> >>> +	if (ret < 0)
> >>> +		goto err_start_pipeline;
> >>> +
> >>> +	ret = sun6i_pipeline_set_stream(video, true);
> >>> +	if (ret < 0)
> >>> +		goto err_start_stream;
> >>> +
> >>> +	config.pixelformat = video->fmt.fmt.pix.pixelformat;
> >>> +	config.code = video->current_fmt->mbus_code;
> >>> +	config.field = video->fmt.fmt.pix.field;
> >>> +	config.width = video->fmt.fmt.pix.width;
> >>> +	config.height = video->fmt.fmt.pix.height;
> >>> +
> >>> +	ret = sun6i_csi_update_config(video->csi, &config);
> >>> +	if (ret < 0)
> >>> +		goto err_update_config;
> >>> +
> >>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> >>> +	video->cur_frm = list_first_entry(&video->dma_queue,
> >>> +					  struct sun6i_csi_buffer, list);
> >>> +	list_del(&video->cur_frm->list);
> >>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> >>> +
> >>> +	ret = sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> >>> +	if (ret < 0)
> >>> +		goto err_update_addr;
> >>> +
> >>> +	ret = sun6i_csi_set_stream(video->csi, true);
> >>> +	if (ret < 0)
> >>> +		goto err_csi_stream;
> >>> +
> >>> +	return 0;
> >>> +
> >>> +err_csi_stream:
> >>> +err_update_addr:
> >>> +err_update_config:
> >>> +	sun6i_pipeline_set_stream(video, false);
> >>> +err_start_stream:
> >>> +	media_pipeline_stop(&video->vdev.entity);
> >>> +err_start_pipeline:
> >>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> >>> +	list_for_each_entry(buf, &video->dma_queue, list)
> >>> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> >>> +	INIT_LIST_HEAD(&video->dma_queue);
> >>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> >>> +
> >>> +	return ret;
> >>> +}
> >>> +
> >>> +static void sun6i_video_stop_streaming(struct vb2_queue *vq)
> >>> +{
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> >>> +	unsigned long flags;
> >>> +	struct sun6i_csi_buffer *buf;
> >>> +
> >>> +	sun6i_pipeline_set_stream(video, false);
> >>> +
> >>> +	sun6i_csi_set_stream(video->csi, false);
> >>> +
> >>> +	media_pipeline_stop(&video->vdev.entity);
> >>> +
> >>> +	/* Release all active buffers */
> >>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> >>> +	if (unlikely(video->cur_frm)) {
> >>> +		vb2_buffer_done(&video->cur_frm->vb.vb2_buf,
> >>> +				VB2_BUF_STATE_ERROR);
> >>> +		video->cur_frm = NULL;
> >>> +	}
> >>> +	list_for_each_entry(buf, &video->dma_queue, list)
> >>> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> >>> +	INIT_LIST_HEAD(&video->dma_queue);
> >>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> >>> +}
> >>> +
> >>> +static void sun6i_video_buffer_queue(struct vb2_buffer *vb)
> >>> +{
> >>> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> >>> +	struct sun6i_csi_buffer *buf =
> >>> +			container_of(vbuf, struct sun6i_csi_buffer, vb);
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> >>> +	unsigned long flags;
> >>> +
> >>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> >>> +	if (!video->cur_frm && list_empty(&video->dma_queue) &&
> >>> +		vb2_is_streaming(vb->vb2_queue)) {
> >>> +		video->cur_frm = buf;
> >>> +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> >>> +		sun6i_csi_set_stream(video->csi, 1);
> >>> +	} else
> >>> +		list_add_tail(&buf->list, &video->dma_queue);
> >>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> >>> +}
> >>> +
> >>> +void sun6i_video_frame_done(struct sun6i_video *video)
> >>> +{
> >>> +	spin_lock(&video->dma_queue_lock);
> >>> +
> >>> +	if (video->cur_frm) {
> >>> +		struct vb2_v4l2_buffer *vbuf = &video->cur_frm->vb;
> >>> +		struct vb2_buffer *vb = &vbuf->vb2_buf;
> >>> +
> >>> +		vb->timestamp = ktime_get_ns();
> >>> +		vbuf->sequence = video->sequence++;
> >>> +		vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> >>> +		video->cur_frm = NULL;
> >>> +	}
> >>> +
> >>> +	if (!list_empty(&video->dma_queue)
> >>> +	    && vb2_is_streaming(&video->vb2_vidq)) {
> >>> +		video->cur_frm = list_first_entry(&video->dma_queue,
> >>> +				struct sun6i_csi_buffer, list);
> >>> +		list_del(&video->cur_frm->list);
> >>> +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> >>> +	} else
> >>> +		sun6i_csi_set_stream(video->csi, 0);
> >>> +
> >>> +	spin_unlock(&video->dma_queue_lock);
> >>> +}
> >>> +
> >>> +static struct vb2_ops sun6i_csi_vb2_ops = {
> >>> +	.queue_setup		= sun6i_video_queue_setup,
> >>> +	.wait_prepare		= vb2_ops_wait_prepare,
> >>> +	.wait_finish		= vb2_ops_wait_finish,
> >>> +	.buf_prepare		= sun6i_video_buffer_prepare,
> >>> +	.start_streaming	= sun6i_video_start_streaming,
> >>> +	.stop_streaming		= sun6i_video_stop_streaming,
> >>> +	.buf_queue		= sun6i_video_buffer_queue,
> >>> +};
> >>> +
> >>> +static int vidioc_querycap(struct file *file, void *priv,
> >>> +				struct v4l2_capability *cap)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +
> >>> +	strlcpy(cap->driver, "sun6i-video", sizeof(cap->driver));
> >>> +	strlcpy(cap->card, video->vdev.name, sizeof(cap->card));
> >>> +	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> >>> +		 video->csi->dev->of_node->name);
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
> >>> +				   struct v4l2_fmtdesc *f)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +	u32 index = f->index;
> >>> +
> >>> +	if (index >= video->num_formats)
> >>> +		return -EINVAL;
> >>> +
> >>> +	f->pixelformat = video->formats[index].fourcc;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
> >>> +				struct v4l2_format *fmt)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +
> >>> +	*fmt = video->fmt;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_try_fmt(struct sun6i_video *video, struct v4l2_format *f,
> >>> +			       struct sun6i_csi_format **current_fmt)
> >>> +{
> >>> +	struct sun6i_csi_format *csi_fmt;
> >>> +	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
> >>> +	struct v4l2_subdev_format format;
> >>> +	struct v4l2_subdev *subdev;
> >>> +	u32 pad;
> >>> +	int ret;
> >>> +
> >>> +	subdev = sun6i_video_remote_subdev(video, &pad);
> >>> +	if (subdev == NULL)
> >>> +		return -ENXIO;
> >>> +
> >>> +	csi_fmt = find_format_by_fourcc(video, pixfmt->pixelformat);
> >>> +	if (csi_fmt == NULL)
> >>> +		return -EINVAL;
> >>> +
> >>> +	format.pad = pad;
> >>> +	format.which = V4L2_SUBDEV_FORMAT_TRY;
> >>> +	v4l2_fill_mbus_format(&format.format, pixfmt, csi_fmt->mbus_code);
> >>> +	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
> >>> +	if (ret)
> >>> +		return ret;
> >>> +
> >>> +	v4l2_fill_pix_format(pixfmt, &format.format);
> >>> +
> >>> +	pixfmt->bytesperline = (pixfmt->width * csi_fmt->bpp) >> 3;
> >>> +	pixfmt->sizeimage = (pixfmt->width * csi_fmt->bpp * pixfmt->height) / 8;
> >>> +
> >>> +	if (current_fmt)
> >>> +		*current_fmt = csi_fmt;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_set_fmt(struct sun6i_video *video, struct v4l2_format *f)
> >>> +{
> >>> +	struct v4l2_subdev_format format;
> >>> +	struct sun6i_csi_format *current_fmt;
> >>> +	struct v4l2_subdev *subdev;
> >>> +	u32 pad;
> >>> +	int ret;
> >>> +
> >>> +	subdev = sun6i_video_remote_subdev(video, &pad);
> >>> +	if (subdev == NULL)
> >>> +		return -ENXIO;
> >>> +
> >>> +	ret = sun6i_video_try_fmt(video, f, &current_fmt);
> >>> +	if (ret)
> >>> +		return ret;
> >>> +
> >>> +	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> >>> +	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
> >>> +			      current_fmt->mbus_code);
> >>> +	ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
> >>> +	if (ret < 0)
> >>> +		return ret;
> >>> +
> >>> +	video->fmt = *f;
> >>> +	video->current_fmt = current_fmt;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
> >>> +				struct v4l2_format *f)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +
> >>> +	if (vb2_is_streaming(&video->vb2_vidq))
> >>
> >> This should be vb2_is_busy(). Once buffers are allocated you are no longer allowed
> >> to change the format, regardless of whether you are streaming or not.
> > 
> > OK.
> > 
> >>
> >>> +		return -EBUSY;
> >>> +
> >>> +	return sun6i_video_set_fmt(video, f);
> >>> +}
> >>> +
> >>> +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
> >>> +				  struct v4l2_format *f)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +
> >>> +	return sun6i_video_try_fmt(video, f, NULL);
> >>> +}
> >>> +
> >>> +static const struct v4l2_ioctl_ops sun6i_video_ioctl_ops = {
> >>> +	.vidioc_querycap		= vidioc_querycap,
> >>> +	.vidioc_enum_fmt_vid_cap	= vidioc_enum_fmt_vid_cap,
> >>> +	.vidioc_g_fmt_vid_cap		= vidioc_g_fmt_vid_cap,
> >>> +	.vidioc_s_fmt_vid_cap		= vidioc_s_fmt_vid_cap,
> >>> +	.vidioc_try_fmt_vid_cap		= vidioc_try_fmt_vid_cap,
> >>> +
> >>> +	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
> >>> +	.vidioc_querybuf		= vb2_ioctl_querybuf,
> >>> +	.vidioc_qbuf			= vb2_ioctl_qbuf,
> >>> +	.vidioc_expbuf			= vb2_ioctl_expbuf,
> >>> +	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
> >>> +	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
> >>> +	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
> >>> +	.vidioc_streamon		= vb2_ioctl_streamon,
> >>> +	.vidioc_streamoff		= vb2_ioctl_streamoff,
> >>> +};
> >>> +
> >>> +/* -----------------------------------------------------------------------------
> >>> + * V4L2 file operations
> >>> + */
> >>> +static int sun6i_video_open(struct file *file)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +	struct v4l2_format format;
> >>> +	int ret;
> >>> +
> >>> +	if (mutex_lock_interruptible(&video->lock))
> >>> +		return -ERESTARTSYS;
> >>> +
> >>> +	ret = v4l2_fh_open(file);
> >>> +	if (ret < 0)
> >>> +		goto unlock;
> >>> +
> >>> +	ret = v4l2_pipeline_pm_use(&video->vdev.entity, 1);
> >>> +	if (ret < 0)
> >>> +		goto fh_release;
> >>> +
> >>> +	if (!v4l2_fh_is_singular_file(file))
> >>> +		goto unlock;
> >>> +
> >>> +	ret = sun6i_csi_set_power(video->csi, true);
> >>> +	if (ret < 0)
> >>> +		goto fh_release;
> >>> +
> >>> +	/* setup default format */
> >>> +	if (video->num_formats > 0) {
> >>> +		format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> >>> +		format.fmt.pix.width = 1280;
> >>> +		format.fmt.pix.height = 720;
> >>> +		format.fmt.pix.pixelformat = video->formats[0].fourcc;
> >>> +		sun6i_video_set_fmt(video, &format);
> >>> +	}
> >>
> >> No, this should happen when the driver is initialized. The format is
> >> persistent over open()/close() calls so should not be re-initialized
> >> here.
> > 
> > OK.
> > 
> >>
> >>> +
> >>> +	mutex_unlock(&video->lock);
> >>> +	return 0;
> >>> +
> >>> +fh_release:
> >>> +	v4l2_fh_release(file);
> >>> +unlock:
> >>> +	mutex_unlock(&video->lock);
> >>> +	return ret;
> >>> +}
> >>> +
> >>> +static int sun6i_video_close(struct file *file)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +	bool last_fh;
> >>> +
> >>> +	mutex_lock(&video->lock);
> >>> +
> >>> +	last_fh = v4l2_fh_is_singular_file(file);
> >>> +
> >>> +	_vb2_fop_release(file, NULL);
> >>> +
> >>> +	v4l2_pipeline_pm_use(&video->vdev.entity, 0);
> >>> +
> >>> +	if (last_fh)
> >>> +		sun6i_csi_set_power(video->csi, false);
> >>> +
> >>> +	mutex_unlock(&video->lock);
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static const struct v4l2_file_operations sun6i_video_fops = {
> >>> +	.owner		= THIS_MODULE,
> >>> +	.open		= sun6i_video_open,
> >>> +	.release	= sun6i_video_close,
> >>> +	.unlocked_ioctl	= video_ioctl2,
> >>> +	.mmap		= vb2_fop_mmap,
> >>> +	.poll		= vb2_fop_poll
> >>> +};
> >>> +
> >>> +/* -----------------------------------------------------------------------------
> >>> + * Media Operations
> >>> + */
> >>> +static int sun6i_video_formats_init(struct sun6i_video *video)
> >>> +{
> >>> +	struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
> >>> +	struct sun6i_csi *csi = video->csi;
> >>> +	struct v4l2_subdev *subdev;
> >>> +	u32 pad;
> >>> +	const u32 *pixformats;
> >>> +	int pixformat_count = 0;
> >>> +	u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
> >>> +	int codes_count = 0;
> >>> +	int num_fmts = 0;
> >>> +	int i, j;
> >>> +
> >>> +	subdev = sun6i_video_remote_subdev(video, &pad);
> >>> +	if (subdev == NULL)
> >>> +		return -ENXIO;
> >>> +
> >>> +	/* Get supported pixformats of CSI */
> >>> +	pixformat_count = sun6i_csi_get_supported_pixformats(csi, &pixformats);
> >>> +	if (pixformat_count <= 0)
> >>> +		return -ENXIO;
> >>> +
> >>> +	/* Get subdev formats codes */
> >>> +	mbus_code.pad = pad;
> >>> +	mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> >>> +	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
> >>> +			&mbus_code)) {
> >>> +		subdev_codes[codes_count] = mbus_code.code;
> >>
> >> This definitely needs a check when codes_count >= ARRAY_SIZE(subdev_codes).
> > 
> > OK.
> > 
> >>
> >>> +		codes_count++;
> >>> +		mbus_code.index++;
> >>> +	}
> >>> +
> >>> +	if (!codes_count)
> >>> +		return -ENXIO;
> >>> +
> >>> +	/* Get supported formats count */
> >>> +	for (i = 0; i < codes_count; i++) {
> >>> +		for (j = 0; j < pixformat_count; j++) {
> >>> +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
> >>> +					mbus_code.code)) {
> >>> +				continue;
> >>> +			}
> >>> +			num_fmts++;
> >>> +		}
> >>> +	}
> >>> +
> >>> +	if (!num_fmts)
> >>> +		return -ENXIO;
> >>> +
> >>> +	video->num_formats = num_fmts;
> >>> +	video->formats = devm_kcalloc(video->csi->dev, num_fmts,
> >>> +			sizeof(struct sun6i_csi_format), GFP_KERNEL);
> >>> +	if (!video->formats) {
> >>> +		dev_err(video->csi->dev, "could not allocate memory\n");
> >>> +		return -ENOMEM;
> >>> +	}
> >>> +
> >>> +	/* Get supported formats */
> >>> +	num_fmts = 0;
> >>> +	for (i = 0; i < codes_count; i++) {
> >>> +		for (j = 0; j < pixformat_count; j++) {
> >>> +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
> >>> +					mbus_code.code)) {
> >>> +				continue;
> >>> +			}
> >>> +
> >>> +			video->formats[num_fmts].fourcc = pixformats[j];
> >>> +			video->formats[num_fmts].mbus_code =
> >>> +					mbus_code.code;
> >>> +			video->formats[num_fmts].bpp =
> >>> +					v4l2_pixformat_get_bpp(pixformats[j]);
> >>> +			num_fmts++;
> >>> +		}
> >>> +	}
> >>
> >> As mentioned above, the initial format should probably be configure here.
> > 
> > OK.
> > 
> >>
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_link_setup(struct media_entity *entity,
> >>> +				  const struct media_pad *local,
> >>> +				  const struct media_pad *remote, u32 flags)
> >>> +{
> >>> +	struct video_device *vdev = media_entity_to_video_device(entity);
> >>> +	struct sun6i_video *video = video_get_drvdata(vdev);
> >>> +
> >>> +	if (WARN_ON(video == NULL))
> >>> +		return 0;
> >>> +
> >>> +	return sun6i_video_formats_init(video);
> >>
> >> Why is this called here? Why not in video_init()?
> > 
> > sun6i_video_init is in the driver probe context. sun6i_video_formats_init
> > use media_entity_remote_pad and media_entity_to_v4l2_subdev to find the
> > subdevs.
> > The media_entity_remote_pad can't work before all the media pad linked.
> 
> A video_init is typically called from the notify_complete callback.
> Actually, that's where the video_register_device should be created as well.
> When you create it in probe() there is possibly no sensor yet, so it would
> be a dead video node (or worse, crash when used).
> 
> There are still a lot of platform drivers that create the video node in the
> probe, but it's not the right place if you rely on the async loading of
> subdevs.

A video_init with media_entity_pads_init must be called before media pad
linking wether is called from probe() or the notify_complete callback.
But, sun6i_video_formats_init must be called after that.

video_register_device is another question. I can seperate it from 
video_init into a new function sun6i_video_register. And call it in
notify_complete callback.

> 
> Regards,
> 
> 	Hans
> 
> Regards,
> 
> 	Hans


Thanks,
Yong

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