Message-ID: <861e5c51-1333-fdc7-2793-d4741a48c72f@xs4all.nl>
Date:	Mon, 15 Aug 2016 14:55:08 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
	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>
Cc:	srv_heupstream@...iatek.com,
	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
Subject: Re: [PATCH v3 3/4] media: Add Mediatek MDP Driver

On 08/09/2016 03:58 PM, Minghsiu Tsai wrote:
> Add MDP driver for MT8173
> 
> Signed-off-by: Minghsiu Tsai <minghsiu.tsai@...iatek.com>
> ---
>  drivers/media/platform/Kconfig                |   16 +
>  drivers/media/platform/Makefile               |    2 +
>  drivers/media/platform/mtk-mdp/Makefile       |    9 +
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.c |  159 ++++
>  drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |   72 ++
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.c |  294 ++++++
>  drivers/media/platform/mtk-mdp/mtk_mdp_core.h |  240 +++++
>  drivers/media/platform/mtk-mdp/mtk_mdp_ipi.h  |  126 +++
>  drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c  | 1263 +++++++++++++++++++++++++
>  drivers/media/platform/mtk-mdp/mtk_mdp_m2m.h  |   22 +
>  drivers/media/platform/mtk-mdp/mtk_mdp_regs.c |  153 +++
>  drivers/media/platform/mtk-mdp/mtk_mdp_regs.h |   31 +
>  drivers/media/platform/mtk-mdp/mtk_mdp_vpu.c  |  145 +++
>  drivers/media/platform/mtk-mdp/mtk_mdp_vpu.h  |   41 +
>  14 files changed, 2573 insertions(+)
>  create mode 100644 drivers/media/platform/mtk-mdp/Makefile
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_core.c
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_core.h
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_ipi.h
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_m2m.h
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_regs.c
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_regs.h
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_vpu.c
>  create mode 100644 drivers/media/platform/mtk-mdp/mtk_mdp_vpu.h
> 
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index f25344b..4bb874b 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -166,6 +166,22 @@ config VIDEO_MEDIATEK_VPU
>  	    To compile this driver as a module, choose M here: the
>  	    module will be called mtk-vpu.
>  
> +config VIDEO_MEDIATEK_MDP
> +	tristate "Mediatek MDP driver"
> +	depends on MTK_IOMMU || COMPILE_TEST
> +	depends on VIDEO_DEV && VIDEO_V4L2
> +	depends on ARCH_MEDIATEK || COMPILE_TEST

This needs a 'depends on HAS_DMA' as well.

> +	select VIDEOBUF2_DMA_CONTIG
> +	select V4L2_MEM2MEM_DEV
> +	select VIDEO_MEDIATEK_VPU
> +	default n
> +	---help---
> +	    It is a v4l2 driver and present in Mediatek MT8173 SoCs.
> +	    The driver supports for scaling and color space conversion.
> +
> +	    To compile this driver as a module, choose M here: the
> +	    module will be called mtk-mdp.
> +
>  config VIDEO_MEDIATEK_VCODEC
>  	tristate "Mediatek Video Codec driver"
>  	depends on MTK_IOMMU || COMPILE_TEST

<snip>

> +
> +/*
> + * Return true if rectangle a is enclosed in rectangle b, or false otherwise.
> + */
> +static bool mtk_mdp_m2m_is_rectangle_enclosed(struct v4l2_rect *a,
> +					     struct v4l2_rect *b)
> +{
> +	if (a->left < b->left || a->top < b->top)
> +		return false;
> +
> +	if (a->left + a->width > b->left + b->width)
> +		return false;
> +
> +	if (a->top + a->height > b->top + b->height)
> +		return false;
> +
> +	return true;
> +}
> +
> +static int mtk_mdp_m2m_g_selection(struct file *file, void *fh,
> +				   struct v4l2_selection *s)
> +{
> +	struct mtk_mdp_frame *frame;
> +	struct mtk_mdp_ctx *ctx = fh_to_ctx(fh);
> +
> +	if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
> +	    (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)) {
> +		mtk_mdp_dbg(1, "[%d] invalid type:%d", ctx->id, s->type);
> +		return -EINVAL;
> +	}
> +
> +	frame = mtk_mdp_ctx_get_frame(ctx, s->type);
> +
> +	switch (s->target) {
> +	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
> +	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
> +	case V4L2_SEL_TGT_CROP_BOUNDS:
> +	case V4L2_SEL_TGT_CROP_DEFAULT:
> +		s->r.left = 0;
> +		s->r.top = 0;
> +		s->r.width = frame->width;
> +		s->r.height = frame->height;
> +		return 0;
> +
> +	case V4L2_SEL_TGT_COMPOSE:
> +	case V4L2_SEL_TGT_CROP:
> +		s->r.left = frame->crop.left;
> +		s->r.top = frame->crop.top;
> +		s->r.width = frame->crop.width;
> +		s->r.height = frame->crop.height;
> +		return 0;
> +	}

This isn't right. For VIDEO_CAPTURE you support the COMPOSE targets, and for
the VIDEO_OUTPUT you support the CROP targets. Right now I can use e.g. TGT_CROP
with VIDEO_CAPTURE, which isn't correct.

s_selection has the same problem.

> +
> +	return -EINVAL;
> +}
> +
> +static int mtk_mdp_check_scaler_ratio(struct mtk_mdp_variant *var, int src_w,
> +				      int src_h, int dst_w, int dst_h, int rot)
> +{
> +	int tmp_w, tmp_h;
> +
> +	if (rot == 90 || rot == 270) {
> +		tmp_w = dst_h;
> +		tmp_h = dst_w;
> +	} else {
> +		tmp_w = dst_w;
> +		tmp_h = dst_h;
> +	}
> +
> +	if ((src_w / tmp_w) > var->h_scale_down_max ||
> +	    (src_h / tmp_h) > var->v_scale_down_max ||
> +	    (tmp_w / src_w) > var->h_scale_up_max ||
> +	    (tmp_h / src_h) > var->v_scale_up_max)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +static int mtk_mdp_m2m_s_selection(struct file *file, void *fh,
> +				   struct v4l2_selection *s)
> +{
> +	struct mtk_mdp_frame *frame;
> +	struct mtk_mdp_ctx *ctx = fh_to_ctx(fh);
> +	struct v4l2_crop cr;
> +	struct mtk_mdp_variant *variant = ctx->mdp_dev->variant;
> +	int ret;
> +
> +	cr.type = s->type;
> +	cr.c = s->r;
> +
> +	if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
> +	    (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)) {
> +		mtk_mdp_dbg(1, "[%d] invalid type:%d", ctx->id, s->type);
> +		return -EINVAL;
> +	}
> +
> +	ret = mtk_mdp_try_crop(ctx, &cr);

Please don't copy to a v4l2_crop. Just stick to v4l2_selection.
I would prefer not to see struct v4l2_crop in drivers.

> +	if (ret)
> +		return ret;
> +
> +	if (s->flags & V4L2_SEL_FLAG_LE &&
> +	    !mtk_mdp_m2m_is_rectangle_enclosed(&cr.c, &s->r))
> +		return -ERANGE;
> +
> +	if (s->flags & V4L2_SEL_FLAG_GE &&
> +	    !mtk_mdp_m2m_is_rectangle_enclosed(&s->r, &cr.c))
> +		return -ERANGE;

As has been discussed for the encoder driver: just adjust the rectangle and
don't return ERANGE. Consider the flags as hints.

The V4L2 documentation is confusing, this will be addressed soon.

> +
> +	s->r = cr.c;
> +
> +	switch (s->target) {
> +	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
> +	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
> +	case V4L2_SEL_TGT_COMPOSE:
> +		frame = &ctx->s_frame;
> +		break;
> +
> +	case V4L2_SEL_TGT_CROP_BOUNDS:
> +	case V4L2_SEL_TGT_CROP:
> +	case V4L2_SEL_TGT_CROP_DEFAULT:
> +		frame = &ctx->d_frame;
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	/* Check to see if scaling ratio is within supported range */
> +	if (mtk_mdp_ctx_state_is_set(ctx, MTK_MDP_DST_FMT | MTK_MDP_SRC_FMT)) {
> +		if (V4L2_TYPE_IS_OUTPUT(s->type)) {
> +			ret = mtk_mdp_check_scaler_ratio(variant, cr.c.width,
> +				cr.c.height, ctx->d_frame.crop.width,
> +				ctx->d_frame.crop.height,
> +				ctx->ctrls.rotate->val);
> +		} else {
> +			ret = mtk_mdp_check_scaler_ratio(variant,
> +				ctx->s_frame.crop.width,
> +				ctx->s_frame.crop.height, cr.c.width,
> +				cr.c.height, ctx->ctrls.rotate->val);
> +		}
> +
> +		if (ret) {
> +			dev_info(&ctx->mdp_dev->pdev->dev,
> +				"Out of scaler range");
> +			return -EINVAL;
> +		}
> +	}
> +
> +	frame->crop = cr.c;
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops mtk_mdp_m2m_ioctl_ops = {
> +	.vidioc_querycap		= mtk_mdp_m2m_querycap,
> +	.vidioc_enum_fmt_vid_cap_mplane	= mtk_mdp_m2m_enum_fmt_mplane_vid_cap,
> +	.vidioc_enum_fmt_vid_out_mplane	= mtk_mdp_m2m_enum_fmt_mplane_vid_out,
> +	.vidioc_g_fmt_vid_cap_mplane	= mtk_mdp_m2m_g_fmt_mplane,
> +	.vidioc_g_fmt_vid_out_mplane	= mtk_mdp_m2m_g_fmt_mplane,
> +	.vidioc_try_fmt_vid_cap_mplane	= mtk_mdp_m2m_try_fmt_mplane,
> +	.vidioc_try_fmt_vid_out_mplane	= mtk_mdp_m2m_try_fmt_mplane,
> +	.vidioc_s_fmt_vid_cap_mplane	= mtk_mdp_m2m_s_fmt_mplane,
> +	.vidioc_s_fmt_vid_out_mplane	= mtk_mdp_m2m_s_fmt_mplane,
> +	.vidioc_reqbufs			= mtk_mdp_m2m_reqbufs,
> +	.vidioc_create_bufs		= v4l2_m2m_ioctl_create_bufs,
> +	.vidioc_expbuf			= v4l2_m2m_ioctl_expbuf,
> +	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
> +	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
> +	.vidioc_querybuf		= v4l2_m2m_ioctl_querybuf,
> +	.vidioc_qbuf			= v4l2_m2m_ioctl_qbuf,
> +	.vidioc_dqbuf			= v4l2_m2m_ioctl_dqbuf,
> +	.vidioc_streamon		= mtk_mdp_m2m_streamon,
> +	.vidioc_streamoff		= v4l2_m2m_ioctl_streamoff,
> +	.vidioc_g_selection		= mtk_mdp_m2m_g_selection,
> +	.vidioc_s_selection		= mtk_mdp_m2m_s_selection
> +};
> +
> +static int mtk_mdp_m2m_queue_init(void *priv, struct vb2_queue *src_vq,
> +				  struct vb2_queue *dst_vq)
> +{
> +	struct mtk_mdp_ctx *ctx = priv;
> +	int ret;
> +
> +	memset(src_vq, 0, sizeof(*src_vq));
> +	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +	src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
> +	src_vq->drv_priv = ctx;
> +	src_vq->ops = &mtk_mdp_m2m_qops;
> +	src_vq->mem_ops = &vb2_dma_contig_memops;
> +	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
> +	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	src_vq->dev = &ctx->mdp_dev->pdev->dev;
> +
> +	ret = vb2_queue_init(src_vq);
> +	if (ret)
> +		return ret;
> +
> +	memset(dst_vq, 0, sizeof(*dst_vq));
> +	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +	dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;

I wouldn't recommend setting VB2_USERPTR in combination with dma_contig.

That only works if the userptr points to physically contiguous memory,
unless there is an iommu that can fix things up.

> +	dst_vq->drv_priv = ctx;
> +	dst_vq->ops = &mtk_mdp_m2m_qops;
> +	dst_vq->mem_ops = &vb2_dma_contig_memops;
> +	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
> +	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	dst_vq->dev = &ctx->mdp_dev->pdev->dev;
> +
> +	return vb2_queue_init(dst_vq);
> +}
> +
> +static int mtk_mdp_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct mtk_mdp_ctx *ctx = ctrl_to_ctx(ctrl);
> +	struct mtk_mdp_dev *mdp = ctx->mdp_dev;
> +	struct mtk_mdp_variant *variant = mdp->variant;
> +	u32 state = MTK_MDP_DST_FMT | MTK_MDP_SRC_FMT;
> +	int ret = 0;
> +
> +	if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_HFLIP:
> +		ctx->hflip = ctrl->val;
> +		break;
> +	case V4L2_CID_VFLIP:
> +		ctx->vflip = ctrl->val;
> +		break;
> +	case V4L2_CID_ROTATE:
> +		if (mtk_mdp_ctx_state_is_set(ctx, state)) {
> +			ret = mtk_mdp_check_scaler_ratio(variant,
> +					ctx->s_frame.crop.width,
> +					ctx->s_frame.crop.height,
> +					ctx->d_frame.crop.width,
> +					ctx->d_frame.crop.height,
> +					ctx->ctrls.rotate->val);
> +
> +			if (ret)
> +				return -EINVAL;
> +		}
> +
> +		ctx->rotation = ctrl->val;
> +		break;
> +	case V4L2_CID_ALPHA_COMPONENT:
> +		ctx->d_frame.alpha = ctrl->val;
> +		break;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_ctrl_ops mtk_mdp_ctrl_ops = {
> +	.s_ctrl = mtk_mdp_s_ctrl,
> +};
> +
> +static int mtk_mdp_ctrls_create(struct mtk_mdp_ctx *ctx)
> +{
> +	v4l2_ctrl_handler_init(&ctx->ctrl_handler, MTK_MDP_MAX_CTRL_NUM);
> +
> +	ctx->ctrls.rotate = v4l2_ctrl_new_std(&ctx->ctrl_handler,
> +			&mtk_mdp_ctrl_ops, V4L2_CID_ROTATE, 0, 270, 90, 0);
> +	ctx->ctrls.hflip = v4l2_ctrl_new_std(&ctx->ctrl_handler,
> +					     &mtk_mdp_ctrl_ops,
> +					     V4L2_CID_HFLIP,
> +					     0, 1, 1, 0);
> +	ctx->ctrls.vflip = v4l2_ctrl_new_std(&ctx->ctrl_handler,
> +					     &mtk_mdp_ctrl_ops,
> +					     V4L2_CID_VFLIP,
> +					     0, 1, 1, 0);
> +	ctx->ctrls.global_alpha = v4l2_ctrl_new_std(&ctx->ctrl_handler,
> +						    &mtk_mdp_ctrl_ops,
> +						    V4L2_CID_ALPHA_COMPONENT,
> +						    0, 255, 1, 0);
> +	ctx->ctrls_rdy = ctx->ctrl_handler.error == 0;
> +
> +	if (ctx->ctrl_handler.error) {
> +		int err = ctx->ctrl_handler.error;
> +
> +		v4l2_ctrl_handler_free(&ctx->ctrl_handler);
> +		dev_err(&ctx->mdp_dev->pdev->dev,
> +			"Failed to create control handlers\n");
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static void mtk_mdp_set_default_params(struct mtk_mdp_ctx *ctx)
> +{
> +	struct mtk_mdp_dev *mdp = ctx->mdp_dev;
> +	struct mtk_mdp_frame *frame;
> +
> +	frame = mtk_mdp_ctx_get_frame(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
> +	frame->fmt = mtk_mdp_find_fmt_by_index(0,
> +					V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
> +	frame->width = mdp->variant->pix_min->org_w;
> +	frame->height = mdp->variant->pix_min->org_h;
> +	frame->payload[0] = frame->width * frame->height;
> +	frame->payload[1] = frame->payload[0] / 2;
> +
> +	frame = mtk_mdp_ctx_get_frame(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +	frame->fmt = mtk_mdp_find_fmt_by_index(0,
> +					V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +	frame->width = mdp->variant->pix_min->target_rot_dis_w;
> +	frame->height = mdp->variant->pix_min->target_rot_dis_h;
> +	frame->payload[0] = frame->width * frame->height;
> +	frame->payload[1] = frame->payload[0] / 2;
> +
> +}
> +
> +static int mtk_mdp_m2m_open(struct file *file)
> +{
> +	struct mtk_mdp_dev *mdp = video_drvdata(file);
> +	struct video_device *vfd = video_devdata(file);
> +	struct mtk_mdp_ctx *ctx = NULL;
> +	int ret;
> +
> +	if (mutex_lock_interruptible(&mdp->lock))
> +		return -ERESTARTSYS;

This lock is taken very early. Move it down to where you really need the lock,
it can certainly be moved to after the kzalloc.

> +
> +	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx) {
> +		ret = -ENOMEM;
> +		goto err_ctx_alloc;
> +	}
> +
> +	mutex_init(&ctx->slock);
> +	ctx->id = mdp->id_counter++;
> +	v4l2_fh_init(&ctx->fh, vfd);
> +	file->private_data = &ctx->fh;
> +	ret = mtk_mdp_ctrls_create(ctx);
> +	if (ret)
> +		goto error_ctrls;
> +
> +	/* Use separate control handler per file handle */
> +	ctx->fh.ctrl_handler = &ctx->ctrl_handler;
> +	v4l2_fh_add(&ctx->fh);
> +	INIT_LIST_HEAD(&ctx->list);
> +
> +	ctx->mdp_dev = mdp;
> +	mtk_mdp_set_default_params(ctx);
> +
> +	INIT_WORK(&ctx->work, mtk_mdp_m2m_worker);
> +	ctx->m2m_ctx = v4l2_m2m_ctx_init(mdp->m2m_dev, ctx,
> +					 mtk_mdp_m2m_queue_init);
> +	if (IS_ERR(ctx->m2m_ctx)) {
> +		dev_err(&mdp->pdev->dev, "Failed to initialize m2m context");
> +		ret = PTR_ERR(ctx->m2m_ctx);
> +		goto error_m2m_ctx;
> +	}
> +	ctx->fh.m2m_ctx = ctx->m2m_ctx;
> +	if (mdp->ctx_num++ == 0) {
> +		ret = vpu_load_firmware(mdp->vpu_dev);
> +		if (ret < 0) {
> +			dev_err(&mdp->pdev->dev,
> +				"vpu_load_firmware failed %d\n", ret);
> +			goto err_load_vpu;
> +		}
> +
> +		ret = mtk_mdp_vpu_register(mdp->pdev);
> +		if (ret < 0) {
> +			dev_err(&mdp->pdev->dev,
> +				"mdp_vpu register failed %d\n", ret);
> +			goto err_load_vpu;
> +		}
> +	}
> +
> +	list_add(&ctx->list, &mdp->ctx_list);
> +	mutex_unlock(&mdp->lock);
> +
> +	mtk_mdp_dbg(0, "%s [%d]", dev_name(&mdp->pdev->dev), ctx->id);
> +
> +	return 0;
> +
> +err_load_vpu:
> +	mdp->ctx_num--;
> +	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> +error_m2m_ctx:
> +	v4l2_ctrl_handler_free(&ctx->ctrl_handler);
> +error_ctrls:
> +	v4l2_fh_del(&ctx->fh);
> +	v4l2_fh_exit(&ctx->fh);
> +err_ctx_alloc:
> +	kfree(ctx);
> +	mutex_unlock(&mdp->lock);
> +
> +	return ret;
> +}

<snip>

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