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Message-ID: <1471586051.1540.11.camel@mtksdaap41>
Date: Fri, 19 Aug 2016 13:54:11 +0800
From: Minghsiu Tsai <minghsiu.tsai@...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>,
<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 Mon, 2016-08-15 at 14:55 +0200, Hans Verkuil wrote:
> 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.
>
Will add it.
> > + 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.
>
So my understanding is
VIDEO_OUTPUT -> only allow to use target XXX_CROP_XXX
VIDEO_CAPTURE -> only allow to use target XXX_COMPOSE_XXX
Am I right?
> > +
> > + 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.
>
I will replace v4l2_crop with u32 and struct v4l2_rect in next version.
> > + 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.
Already adjust rectangle in mtk_mdp_try_crop() before that, so I will
remove the two condition check in next version.
> 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.
>
I will remove VB2_USERPTR.Thanks.
> > + 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.
>
I will move mutex_loc after kzalloc. Thanks for your suggestions.
> > +
> > + 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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