Message-ID: <1461561405.11415.12.camel@mtksdaap41>
Date:	Mon, 25 Apr 2016 13:16:45 +0800
From:	tiffany lin <tiffany.lin@...iatek.com>
To:	Hans Verkuil <hverkuil@...all.nl>
CC:	Hans Verkuil <hans.verkuil@...co.com>,
	<daniel.thompson@...aro.org>, "Rob Herring" <robh+dt@...nel.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Pawel Osciak <posciak@...omium.org>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-media@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>, <PoChun.Lin@...iatek.com>
Subject: Re: [PATCH v7 5/8] [media] vcodec: mediatek: Add Mediatek V4L2
 Video Encoder Driver

Hi Hans,


On Fri, 2016-04-22 at 15:47 +0200, Hans Verkuil wrote:
> On 04/22/2016 06:25 AM, Tiffany Lin wrote:
> > Add v4l2 layer encoder driver for MT8173
> > 
> > Signed-off-by: Tiffany Lin <tiffany.lin@...iatek.com>
> > 
> > ---
> >  drivers/media/platform/Kconfig                     |   16 +
> >  drivers/media/platform/Makefile                    |    2 +
> >  drivers/media/platform/mtk-vcodec/Makefile         |   14 +
> >  drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h |  339 +++++
> >  drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c | 1301 ++++++++++++++++++++
> >  drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.h |   59 +
> >  .../media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c |  467 +++++++
> >  .../media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c  |  137 +++
> >  .../media/platform/mtk-vcodec/mtk_vcodec_enc_pm.h  |   26 +
> >  .../media/platform/mtk-vcodec/mtk_vcodec_intr.c    |   56 +
> >  .../media/platform/mtk-vcodec/mtk_vcodec_intr.h    |   27 +
> >  .../media/platform/mtk-vcodec/mtk_vcodec_util.c    |   96 ++
> >  .../media/platform/mtk-vcodec/mtk_vcodec_util.h    |   87 ++
> >  drivers/media/platform/mtk-vcodec/venc_drv_base.h  |   62 +
> >  drivers/media/platform/mtk-vcodec/venc_drv_if.c    |  107 ++
> >  drivers/media/platform/mtk-vcodec/venc_drv_if.h    |  165 +++
> >  drivers/media/platform/mtk-vcodec/venc_ipi_msg.h   |  210 ++++
> >  17 files changed, 3171 insertions(+)
> >  create mode 100644 drivers/media/platform/mtk-vcodec/Makefile
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/venc_drv_base.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/venc_drv_if.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/venc_drv_if.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/venc_ipi_msg.h
> > 
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
> > new file mode 100644
> > index 0000000..b2b662c
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
> > @@ -0,0 +1,1301 @@
> > +/* V4L2 specification suggests the driver corrects the format struct if any of
> > +  * the dimensions is unsupported
> > +  */
> > +static int vidioc_try_fmt(struct v4l2_format *f, struct mtk_video_fmt *fmt)
> > +{
> > +	struct v4l2_pix_format_mplane *pix_fmt_mp = &f->fmt.pix_mp;
> > +	int i;
> > +
> > +	pix_fmt_mp->field = V4L2_FIELD_NONE;
> > +
> > +	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> > +		pix_fmt_mp->num_planes = 1;
> > +		pix_fmt_mp->plane_fmt[0].bytesperline = 0;
> > +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> > +		int tmp_w, tmp_h;
> > +
> > +		pix_fmt_mp->height = clamp(pix_fmt_mp->height,
> > +								MTK_VENC_MIN_H,
> > +								MTK_VENC_MAX_H);
> > +		pix_fmt_mp->width = clamp(pix_fmt_mp->width,
> > +								MTK_VENC_MIN_W,
> > +								MTK_VENC_MAX_W);
> 
> Strange indentation. I see this in more places. Can you check this and fix
> where needed?
> 
I will fix all this strange indentation in next version.

> > +
> > +		/* find next closer width align 16, heign align 32, size align
> > +		  * 64 rectangle
> > +		  */
> > +		tmp_w = pix_fmt_mp->width;
> > +		tmp_h = pix_fmt_mp->height;
> > +		v4l_bound_align_image(&pix_fmt_mp->width,
> > +							MTK_VENC_MIN_W,
> > +							MTK_VENC_MAX_W, 4,
> > +							&pix_fmt_mp->height,
> > +							MTK_VENC_MIN_H,
> > +							MTK_VENC_MAX_H, 5, 6);
> > +
> 
> ...
> 
> > +static int vidioc_try_fmt_vid_out_mplane(struct file *file, void *priv,
> > +					 struct v4l2_format *f)
> > +{
> > +	struct mtk_video_fmt *fmt;
> > +
> > +	fmt = mtk_venc_find_format(f);
> > +	if (!fmt) {
> > +		f->fmt.pix.pixelformat = mtk_video_formats[OUT_FMT_IDX].fourcc;
> > +		fmt = mtk_venc_find_format(f);
> > +	}
> > +	if (!f->fmt.pix_mp.colorspace)
> > +		f->fmt.pix_mp.colorspace = V4L2_COLORSPACE_REC709;
> > +	f->fmt.pix_mp.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> > +	f->fmt.pix_mp.quantization = V4L2_QUANTIZATION_DEFAULT;
> > +	f->fmt.pix_mp.xfer_func = V4L2_XFER_FUNC_DEFAULT;
> 
> This should all be under the 'if'. If colorspace is 0, then you can assume that
> whatever colorspace information userspace passes to the driver is wrong and
> that is should be set to a proper default.
> 
Got it, will fix this in next version.

> > +
> > +	return vidioc_try_fmt(f, fmt);
> > +}
> > +
> 
> ...
> 
> > +static int fops_vcodec_open(struct file *file)
> > +{
> > +	struct video_device *vfd = video_devdata(file);
> > +	struct mtk_vcodec_dev *dev = video_drvdata(file);
> > +	struct mtk_vcodec_ctx *ctx = NULL;
> > +	int ret = 0;
> > +
> > +	if (dev->instance_mask == ~0UL) {
> > +		/* ffz Undefined if no zero exists, err handling here */
> > +		mtk_v4l2_err("Too many open contexts");
> > +		ret = -EBUSY;
> > +		goto err_alloc;
> 
> I'm not happy seeing this here. You should always be able to open the device.
> I would expect to see a check like this in e.g. start_streaming, since that's
> where you start to use the hardware for real, and checking if you have enough
> resources there is perfectly fine.
> 
> If this is an artificial constraint (i.e. not based on a real hardware limitation),
> then it should perhaps just be dropped. Such constraints tend to be pointless.
> If you want to encode 20 streams simultaneously, then why not? It will be very
> slow, but that's not this driver's problem :-)
> 
We use ffz to get instance index.
This only make sure that instance id is correct since in ffz
description,
"Undefined if no zero exists, so code should check against ~0UL first."
In this case, it may not be able to move to start_streaming.
Any suggestion that how we do this?


> > +	}
> > +
> > +	mutex_lock(&dev->dev_mutex);
> > +
> > +	ctx = devm_kzalloc(&dev->plat_dev->dev, sizeof(*ctx), GFP_KERNEL);
> 
> Why is this a devm_ call? It is not managed by a device, so it seems to me that
> a regular kzalloc is good enough here.
> 
> > +	if (!ctx) {
> > +		ret = -ENOMEM;
> > +		goto err_alloc;
> > +	}
> > +
> > +	ctx->idx = ffz(dev->instance_mask);
> > +	v4l2_fh_init(&ctx->fh, video_devdata(file));
> > +	file->private_data = &ctx->fh;
> > +	v4l2_fh_add(&ctx->fh);
> > +	INIT_LIST_HEAD(&ctx->list);
> > +	ctx->dev = dev;
> > +	init_waitqueue_head(&ctx->queue);
> > +
> > +	if (vfd == dev->vfd_enc) {
> > +		ctx->type = MTK_INST_ENCODER;
> > +		ret = mtk_vcodec_enc_ctrls_setup(ctx);
> > +		if (ret) {
> > +			mtk_v4l2_err("Failed to setup controls() (%d)",
> > +				       ret);
> > +			goto err_ctrls_setup;
> > +		}
> > +		ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev_enc, ctx,
> > +						 &mtk_vcodec_enc_queue_init);
> > +		if (IS_ERR(ctx->m2m_ctx)) {
> > +			ret = PTR_ERR(ctx->m2m_ctx);
> > +			mtk_v4l2_err("Failed to v4l2_m2m_ctx_init() (%d)",
> > +				       ret);
> > +			goto err_m2m_ctx_init;
> > +		}
> > +		mtk_vcodec_enc_set_default_params(ctx);
> > +	} else {
> > +		mtk_v4l2_err("Invalid vfd !");
> 
> This shouldn't be possible at all. I would just drop the 'if (vfd == dev->vfd_enc)' check.
Got it, will remove in next version.

> 
> > +		ret = -ENOENT;
> > +		goto err_m2m_ctx_init;
> > +	}
> > +
> > +	if (v4l2_fh_is_singular(&ctx->fh)) {
> > +		ret = vpu_load_firmware(dev->vpu_plat_dev);
> > +		if (ret < 0) {
> > +			/*
> > +			  * Return 0 if downloading firmware successfully,
> > +			  * otherwise it is failed
> > +			  */
> > +			mtk_v4l2_err("vpu_load_firmware failed!");
> > +			goto err_load_fw;
> > +		}
> 
> The fw load seems to be a one-time thing, but here it is done every time
> someone opens the device and nobody else had it open.
> 
> If this is a one time thing, then using a bool 'loaded_fw' makes more sense.
> 
More than one module use vpu firmware, encoder/decoder/mdp...etc.
If this is first encode instance, we need to check and load vpu
firmware.
vpu_load_firmware will check and load firmware when necessary.

best regards,
Tiffany
> > +
> > +		dev->enc_capability =
> > +			vpu_get_venc_hw_capa(dev->vpu_plat_dev);
> > +		mtk_v4l2_debug(0, "encoder capability %x", dev->enc_capability);
> > +	}
> > +
> > +	mtk_v4l2_debug(2, "Create instance [%d]@%p m2m_ctx=%p ",
> > +			 ctx->idx, ctx, ctx->m2m_ctx);
> > +	set_bit(ctx->idx, &dev->instance_mask);
> > +	dev->num_instances++;
> > +	list_add(&ctx->list, &dev->ctx_list);
> > +
> > +	mutex_unlock(&dev->dev_mutex);
> > +	mtk_v4l2_debug(0, "%s encoder [%d]", dev_name(&dev->plat_dev->dev),
> > +				   ctx->idx);
> > +	return ret;
> > +
> > +	/* Deinit when failure occurred */
> > +err_load_fw:
> > +	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> > +err_m2m_ctx_init:
> > +	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
> > +err_ctrls_setup:
> > +	v4l2_fh_del(&ctx->fh);
> > +	v4l2_fh_exit(&ctx->fh);
> > +	devm_kfree(&dev->plat_dev->dev, ctx);
> > +err_alloc:
> > +	mutex_unlock(&dev->dev_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static int fops_vcodec_release(struct file *file)
> > +{
> > +	struct mtk_vcodec_dev *dev = video_drvdata(file);
> > +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);
> > +
> > +	mtk_v4l2_debug(1, "[%d] encoder", ctx->idx);
> > +	mutex_lock(&dev->dev_mutex);
> > +
> > +	mtk_vcodec_enc_release(ctx);
> > +	v4l2_fh_del(&ctx->fh);
> > +	v4l2_fh_exit(&ctx->fh);
> > +	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
> > +	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> > +
> > +	list_del_init(&ctx->list);
> > +	dev->num_instances--;
> > +	clear_bit(ctx->idx, &dev->instance_mask);
> > +	devm_kfree(&dev->plat_dev->dev, ctx);
> > +	mutex_unlock(&dev->dev_mutex);
> > +	return 0;
> > +}
> > +
> > +static const struct v4l2_file_operations mtk_vcodec_fops = {
> > +	.owner				= THIS_MODULE,
> > +	.open				= fops_vcodec_open,
> > +	.release			= fops_vcodec_release,
> > +	.poll				= v4l2_m2m_fop_poll,
> > +	.unlocked_ioctl			= video_ioctl2,
> > +	.mmap				= v4l2_m2m_fop_mmap,
> > +};
> > +
> > +static int mtk_vcodec_probe(struct platform_device *pdev)
> > +{
> > +	struct mtk_vcodec_dev *dev;
> > +	struct video_device *vfd_enc;
> > +	struct resource *res;
> > +	int i, j, ret;
> > +	DEFINE_DMA_ATTRS(attrs);
> > +
> > +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> > +	if (!dev)
> > +		return -ENOMEM;
> > +
> > +	INIT_LIST_HEAD(&dev->ctx_list);
> > +	dev->plat_dev = pdev;
> > +
> > +	dev->vpu_plat_dev = vpu_get_plat_device(dev->plat_dev);
> > +	if (dev->vpu_plat_dev == NULL) {
> > +		mtk_v4l2_err("[VPU] vpu device in not ready");
> > +		return -EPROBE_DEFER;
> > +	}
> > +
> > +	vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_enc_reset_handler,
> > +						dev, VPU_RST_ENC);
> > +
> > +	ret = mtk_vcodec_init_enc_pm(dev);
> > +	if (ret < 0) {
> > +		dev_err(&pdev->dev, "Failed to get mt vcodec clock source!");
> > +		return ret;
> > +	}
> > +
> > +	for (i = VENC_SYS, j = 0; i < NUM_MAX_VCODEC_REG_BASE; i++, j++) {
> > +		res = platform_get_resource(pdev, IORESOURCE_MEM, j);
> > +		if (res == NULL) {
> > +			dev_err(&pdev->dev, "get memory resource failed.");
> > +			ret = -ENXIO;
> > +			goto err_res;
> > +		}
> > +		dev->reg_base[i] = devm_ioremap_resource(&pdev->dev, res);
> > +		if (IS_ERR(dev->reg_base[i])) {
> > +			dev_err(&pdev->dev,
> > +				"devm_ioremap_resource %d failed.", i);
> > +			ret = PTR_ERR(dev->reg_base[i]);
> > +			goto err_res;
> > +		}
> > +		mtk_v4l2_debug(2, "reg[%d] base=0x%p", i, dev->reg_base[i]);
> > +	}
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > +	if (res == NULL) {
> > +		dev_err(&pdev->dev, "failed to get irq resource");
> > +		ret = -ENOENT;
> > +		goto err_res;
> > +	}
> > +
> > +	dev->enc_irq = platform_get_irq(pdev, 0);
> > +	ret = devm_request_irq(&pdev->dev, dev->enc_irq,
> > +			       mtk_vcodec_enc_irq_handler,
> > +			       0, pdev->name, dev);
> > +	if (ret) {
> > +		dev_err(&pdev->dev, "Failed to install dev->enc_irq %d (%d)",
> > +			dev->enc_irq,
> > +			ret);
> > +		ret = -EINVAL;
> > +		goto err_res;
> > +	}
> > +
> > +	dev->enc_lt_irq = platform_get_irq(pdev, 1);
> > +	ret = devm_request_irq(&pdev->dev,
> > +			       dev->enc_lt_irq, mtk_vcodec_enc_lt_irq_handler,
> > +			       0, pdev->name, dev);
> > +	if (ret) {
> > +		dev_err(&pdev->dev,
> > +			"Failed to install dev->enc_lt_irq %d (%d)",
> > +			dev->enc_lt_irq, ret);
> > +		ret = -EINVAL;
> > +		goto err_res;
> > +	}
> > +
> > +	disable_irq(dev->enc_irq);
> > +	disable_irq(dev->enc_lt_irq); /* VENC_LT */
> > +	mutex_init(&dev->enc_mutex);
> > +	mutex_init(&dev->dev_mutex);
> > +	spin_lock_init(&dev->irqlock);
> > +
> > +	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
> > +		 "[MTK_V4L2_VENC]");
> > +
> > +	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
> > +	if (ret) {
> > +		mtk_v4l2_err("v4l2_device_register err=%d", ret);
> > +		goto err_res;
> > +	}
> > +
> > +	init_waitqueue_head(&dev->queue);
> > +
> > +	/* allocate video device for encoder and register it */
> > +	vfd_enc = video_device_alloc();
> > +	if (!vfd_enc) {
> > +		mtk_v4l2_err("Failed to allocate video device");
> > +		ret = -ENOMEM;
> > +		goto err_enc_alloc;
> > +	}
> > +	vfd_enc->fops           = &mtk_vcodec_fops;
> > +	vfd_enc->ioctl_ops      = &mtk_venc_ioctl_ops;
> > +	vfd_enc->release        = video_device_release;
> > +	vfd_enc->lock           = &dev->dev_mutex;
> > +	vfd_enc->v4l2_dev       = &dev->v4l2_dev;
> > +	vfd_enc->vfl_dir        = VFL_DIR_M2M;
> > +	vfd_enc->device_caps	= V4L2_CAP_VIDEO_M2M_MPLANE |
> > +						V4L2_CAP_STREAMING;
> > +
> > +	snprintf(vfd_enc->name, sizeof(vfd_enc->name), "%s",
> > +		 MTK_VCODEC_ENC_NAME);
> > +	video_set_drvdata(vfd_enc, dev);
> > +	dev->vfd_enc = vfd_enc;
> > +	platform_set_drvdata(pdev, dev);
> > +
> > +	dev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
> > +	if (IS_ERR(dev->alloc_ctx)) {
> > +		dev->alloc_ctx = NULL;
> > +		mtk_v4l2_err("Failed to alloc vb2 dma context 0");
> > +		ret = PTR_ERR(dev->alloc_ctx);
> > +		goto err_vb2_ctx_init;
> > +	}
> > +
> > +	dev->m2m_dev_enc = v4l2_m2m_init(&mtk_venc_m2m_ops);
> > +	if (IS_ERR(dev->m2m_dev_enc)) {
> > +		mtk_v4l2_err("Failed to init mem2mem enc device");
> > +		ret = PTR_ERR(dev->m2m_dev_enc);
> > +		goto err_enc_mem_init;
> > +	}
> > +
> > +	dev->encode_workqueue =
> > +			alloc_ordered_workqueue(MTK_VCODEC_ENC_NAME,
> > +								WQ_MEM_RECLAIM |
> > +								WQ_FREEZABLE);
> > +	if (!dev->encode_workqueue) {
> > +		mtk_v4l2_err("Failed to create encode workqueue");
> > +		ret = -EINVAL;
> > +		goto err_event_workq;
> > +	}
> > +
> > +	ret = video_register_device(vfd_enc, VFL_TYPE_GRABBER, 1);
> > +	if (ret) {
> > +		mtk_v4l2_err("Failed to register video device");
> > +		goto err_enc_reg;
> > +	}
> > +
> > +	/* Avoid the iommu eat big hunks */
> > +	dma_set_attr(DMA_ATTR_ALLOC_SINGLE_PAGES, &attrs);
> > +
> > +	mtk_v4l2_debug(0, "encoder registered as /dev/video%d",
> > +			 vfd_enc->num);
> > +
> > +	return 0;
> > +
> > +err_enc_reg:
> > +	destroy_workqueue(dev->encode_workqueue);
> > +err_event_workq:
> > +	v4l2_m2m_release(dev->m2m_dev_enc);
> > +err_enc_mem_init:
> > +	vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
> > +err_vb2_ctx_init:
> > +	video_unregister_device(vfd_enc);
> > +err_enc_alloc:
> > +	v4l2_device_unregister(&dev->v4l2_dev);
> > +err_res:
> > +	mtk_vcodec_release_enc_pm(dev);
> > +	return ret;
> > +}
> > +
> > +static const struct of_device_id mtk_vcodec_enc_match[] = {
> > +	{.compatible = "mediatek,mt8173-vcodec-enc",},
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, mtk_vcodec_enc_match);
> > +
> > +static int mtk_vcodec_enc_remove(struct platform_device *pdev)
> > +{
> > +	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);
> > +
> > +	mtk_v4l2_debug_enter();
> > +	flush_workqueue(dev->encode_workqueue);
> > +	destroy_workqueue(dev->encode_workqueue);
> > +	if (dev->m2m_dev_enc)
> > +		v4l2_m2m_release(dev->m2m_dev_enc);
> > +	if (dev->alloc_ctx)
> > +		vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
> > +
> > +	if (dev->vfd_enc)
> > +		video_unregister_device(dev->vfd_enc);
> > +
> > +	v4l2_device_unregister(&dev->v4l2_dev);
> > +	mtk_vcodec_release_enc_pm(dev);
> > +	return 0;
> > +}
> > +
> > +static struct platform_driver mtk_vcodec_enc_driver = {
> > +	.probe	= mtk_vcodec_probe,
> > +	.remove	= mtk_vcodec_enc_remove,
> > +	.driver	= {
> > +		.name	= MTK_VCODEC_ENC_NAME,
> > +		.owner	= THIS_MODULE,
> > +		.of_match_table = mtk_vcodec_enc_match,
> > +	},
> > +};
> > +
> > +module_platform_driver(mtk_vcodec_enc_driver);
> > +
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_DESCRIPTION("Mediatek video codec V4L2 encoder driver");
> 
> Regards,
> 
> 	Hans

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