[media] gscaler: Add m2m functionality for the G-Scaler driver

This patch adds the memory to memory (m2m) interface functionality
for the G-Scaler driver.

[mchehab@redhat.com: Fixed a small coding style issue:
 sizeof *ctx should be sizeof(*ctx)]
Signed-off-by: Hynwoong Kim <khw0178.kim@samsung.com>
Signed-off-by: Sungchun Kang <sungchun.kang@samsung.com>
Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 771 insertions, 0 deletions

diff --git a/drivers/media/platform/exynos-gsc/gsc-m2m.c b/drivers/media/platform/exynos-gsc/gsc-m2m.c
new file mode 100644
index 00000000000..2589cae4e48
--- /dev/null
+++ b/drivers/media/platform/exynos-gsc/gsc-m2m.c
@@ -0,0 +1,771 @@
+/*
+ * Copyright (c) 2011 - 2012 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * Samsung EXYNOS5 SoC series G-Scaler driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 2 of the License,
+ * or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/bug.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/list.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+
+#include <media/v4l2-ioctl.h>
+
+#include "gsc-core.h"
+
+static int gsc_m2m_ctx_stop_req(struct gsc_ctx *ctx)
+{
+        struct gsc_ctx *curr_ctx;
+        struct gsc_dev *gsc = ctx->gsc_dev;
+        int ret;
+
+        curr_ctx = v4l2_m2m_get_curr_priv(gsc->m2m.m2m_dev);
+        if (!gsc_m2m_pending(gsc) || (curr_ctx != ctx))
+                return 0;
+
+        gsc_ctx_state_lock_set(GSC_CTX_STOP_REQ, ctx);
+        ret = wait_event_timeout(gsc->irq_queue,
+                        !gsc_ctx_state_is_set(GSC_CTX_STOP_REQ, ctx),
+                        GSC_SHUTDOWN_TIMEOUT);
+
+        return ret == 0 ? -ETIMEDOUT : ret;
+}
+
+static int gsc_m2m_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+        struct gsc_ctx *ctx = q->drv_priv;
+        int ret;
+
+        ret = pm_runtime_get_sync(&ctx->gsc_dev->pdev->dev);
+        return ret > 0 ? 0 : ret;
+}
+
+static int gsc_m2m_stop_streaming(struct vb2_queue *q)
+{
+        struct gsc_ctx *ctx = q->drv_priv;
+        int ret;
+
+        ret = gsc_m2m_ctx_stop_req(ctx);
+        if (ret == -ETIMEDOUT)
+                gsc_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR);
+
+        pm_runtime_put(&ctx->gsc_dev->pdev->dev);
+
+        return 0;
+}
+
+void gsc_m2m_job_finish(struct gsc_ctx *ctx, int vb_state)
+{
+        struct vb2_buffer *src_vb, *dst_vb;
+
+        if (!ctx || !ctx->m2m_ctx)
+                return;
+
+        src_vb = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+        dst_vb = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
+
+        if (src_vb && dst_vb) {
+                v4l2_m2m_buf_done(src_vb, vb_state);
+                v4l2_m2m_buf_done(dst_vb, vb_state);
+
+                v4l2_m2m_job_finish(ctx->gsc_dev->m2m.m2m_dev,
+                                    ctx->m2m_ctx);
+        }
+}
+
+
+static void gsc_m2m_job_abort(void *priv)
+{
+        struct gsc_ctx *ctx = priv;
+        int ret;
+
+        ret = gsc_m2m_ctx_stop_req(ctx);
+        if (ret == -ETIMEDOUT)
+                gsc_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR);
+}
+
+int gsc_fill_addr(struct gsc_ctx *ctx)
+{
+        struct gsc_frame *s_frame, *d_frame;
+        struct vb2_buffer *vb = NULL;
+        int ret;
+
+        s_frame = &ctx->s_frame;
+        d_frame = &ctx->d_frame;
+
+        vb = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
+        ret = gsc_prepare_addr(ctx, vb, s_frame, &s_frame->addr);
+        if (ret)
+                return ret;
+
+        vb = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
+        return gsc_prepare_addr(ctx, vb, d_frame, &d_frame->addr);
+}
+
+static void gsc_m2m_device_run(void *priv)
+{
+        struct gsc_ctx *ctx = priv;
+        struct gsc_dev *gsc;
+        unsigned long flags;
+        u32 ret;
+        bool is_set = false;
+
+        if (WARN(!ctx, "null hardware context\n"))
+                return;
+
+        gsc = ctx->gsc_dev;
+        spin_lock_irqsave(&gsc->slock, flags);
+
+        set_bit(ST_M2M_PEND, &gsc->state);
+
+        /* Reconfigure hardware if the context has changed. */
+        if (gsc->m2m.ctx != ctx) {
+                pr_debug("gsc->m2m.ctx = 0x%p, current_ctx = 0x%p",
+                                gsc->m2m.ctx, ctx);
+                ctx->state |= GSC_PARAMS;
+                gsc->m2m.ctx = ctx;
+        }
+
+        is_set = (ctx->state & GSC_CTX_STOP_REQ) ? 1 : 0;
+        ctx->state &= ~GSC_CTX_STOP_REQ;
+        if (is_set) {
+                wake_up(&gsc->irq_queue);
+                goto put_device;
+        }
+
+        ret = gsc_fill_addr(ctx);
+        if (ret) {
+                pr_err("Wrong address");
+                goto put_device;
+        }
+
+        gsc_set_prefbuf(gsc, &ctx->s_frame);
+        gsc_hw_set_input_addr(gsc, &ctx->s_frame.addr, GSC_M2M_BUF_NUM);
+        gsc_hw_set_output_addr(gsc, &ctx->d_frame.addr, GSC_M2M_BUF_NUM);
+
+        if (ctx->state & GSC_PARAMS) {
+                gsc_hw_set_input_buf_masking(gsc, GSC_M2M_BUF_NUM, false);
+                gsc_hw_set_output_buf_masking(gsc, GSC_M2M_BUF_NUM, false);
+                gsc_hw_set_frm_done_irq_mask(gsc, false);
+                gsc_hw_set_gsc_irq_enable(gsc, true);
+
+                if (gsc_set_scaler_info(ctx)) {
+                        pr_err("Scaler setup error");
+                        goto put_device;
+                }
+
+                gsc_hw_set_input_path(ctx);
+                gsc_hw_set_in_size(ctx);
+                gsc_hw_set_in_image_format(ctx);
+
+                gsc_hw_set_output_path(ctx);
+                gsc_hw_set_out_size(ctx);
+                gsc_hw_set_out_image_format(ctx);
+
+                gsc_hw_set_prescaler(ctx);
+                gsc_hw_set_mainscaler(ctx);
+                gsc_hw_set_rotation(ctx);
+                gsc_hw_set_global_alpha(ctx);
+        }
+
+        /* update shadow registers */
+        gsc_hw_set_sfr_update(ctx);
+
+        ctx->state &= ~GSC_PARAMS;
+        gsc_hw_enable_control(gsc, true);
+
+        spin_unlock_irqrestore(&gsc->slock, flags);
+        return;
+
+put_device:
+        ctx->state &= ~GSC_PARAMS;
+        spin_unlock_irqrestore(&gsc->slock, flags);
+}
+
+static int gsc_m2m_queue_setup(struct vb2_queue *vq,
+                        const struct v4l2_format *fmt,
+                        unsigned int *num_buffers, unsigned int *num_planes,
+                        unsigned int sizes[], void *allocators[])
+{
+        struct gsc_ctx *ctx = vb2_get_drv_priv(vq);
+        struct gsc_frame *frame;
+        int i;
+
+        frame = ctx_get_frame(ctx, vq->type);
+        if (IS_ERR(frame))
+                return PTR_ERR(frame);
+
+        if (!frame->fmt)
+                return -EINVAL;
+
+        *num_planes = frame->fmt->num_planes;
+        for (i = 0; i < frame->fmt->num_planes; i++) {
+                sizes[i] = frame->payload[i];
+                allocators[i] = ctx->gsc_dev->alloc_ctx;
+        }
+        return 0;
+}
+
+static int gsc_m2m_buf_prepare(struct vb2_buffer *vb)
+{
+        struct gsc_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+        struct gsc_frame *frame;
+        int i;
+
+        frame = ctx_get_frame(ctx, vb->vb2_queue->type);
+        if (IS_ERR(frame))
+                return PTR_ERR(frame);
+
+        if (!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
+                for (i = 0; i < frame->fmt->num_planes; i++)
+                        vb2_set_plane_payload(vb, i, frame->payload[i]);
+        }
+
+        return 0;
+}
+
+static void gsc_m2m_buf_queue(struct vb2_buffer *vb)
+{
+        struct gsc_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+
+        pr_debug("ctx: %p, ctx->state: 0x%x", ctx, ctx->state);
+
+        if (ctx->m2m_ctx)
+                v4l2_m2m_buf_queue(ctx->m2m_ctx, vb);
+}
+
+struct vb2_ops gsc_m2m_qops = {
+        .queue_setup     = gsc_m2m_queue_setup,
+        .buf_prepare     = gsc_m2m_buf_prepare,
+        .buf_queue       = gsc_m2m_buf_queue,
+        .wait_prepare    = gsc_unlock,
+        .wait_finish     = gsc_lock,
+        .stop_streaming  = gsc_m2m_stop_streaming,
+        .start_streaming = gsc_m2m_start_streaming,
+};
+
+static int gsc_m2m_querycap(struct file *file, void *fh,
+                           struct v4l2_capability *cap)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+        struct gsc_dev *gsc = ctx->gsc_dev;
+
+        strlcpy(cap->driver, gsc->pdev->name, sizeof(cap->driver));
+        strlcpy(cap->card, gsc->pdev->name, sizeof(cap->card));
+        strlcpy(cap->bus_info, "platform", sizeof(cap->bus_info));
+        cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE |
+                V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_OUTPUT_MPLANE;
+
+        cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+        return 0;
+}
+
+static int gsc_m2m_enum_fmt_mplane(struct file *file, void *priv,
+                                struct v4l2_fmtdesc *f)
+{
+        return gsc_enum_fmt_mplane(f);
+}
+
+static int gsc_m2m_g_fmt_mplane(struct file *file, void *fh,
+                             struct v4l2_format *f)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+
+        return gsc_g_fmt_mplane(ctx, f);
+}
+
+static int gsc_m2m_try_fmt_mplane(struct file *file, void *fh,
+                                  struct v4l2_format *f)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+
+        return gsc_try_fmt_mplane(ctx, f);
+}
+
+static int gsc_m2m_s_fmt_mplane(struct file *file, void *fh,
+                                 struct v4l2_format *f)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+        struct vb2_queue *vq;
+        struct gsc_frame *frame;
+        struct v4l2_pix_format_mplane *pix;
+        int i, ret = 0;
+
+        ret = gsc_m2m_try_fmt_mplane(file, fh, f);
+        if (ret)
+                return ret;
+
+        vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
+
+        if (vb2_is_streaming(vq)) {
+                pr_err("queue (%d) busy", f->type);
+                return -EBUSY;
+        }
+
+        if (V4L2_TYPE_IS_OUTPUT(f->type))
+                frame = &ctx->s_frame;
+        else
+                frame = &ctx->d_frame;
+
+        pix = &f->fmt.pix_mp;
+        frame->fmt = find_fmt(&pix->pixelformat, NULL, 0);
+        frame->colorspace = pix->colorspace;
+        if (!frame->fmt)
+                return -EINVAL;
+
+        for (i = 0; i < frame->fmt->num_planes; i++)
+                frame->payload[i] = pix->plane_fmt[i].sizeimage;
+
+        gsc_set_frame_size(frame, pix->width, pix->height);
+
+        if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+                gsc_ctx_state_lock_set(GSC_PARAMS | GSC_DST_FMT, ctx);
+        else
+                gsc_ctx_state_lock_set(GSC_PARAMS | GSC_SRC_FMT, ctx);
+
+        pr_debug("f_w: %d, f_h: %d", frame->f_width, frame->f_height);
+
+        return 0;
+}
+
+static int gsc_m2m_reqbufs(struct file *file, void *fh,
+                          struct v4l2_requestbuffers *reqbufs)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+        struct gsc_dev *gsc = ctx->gsc_dev;
+        struct gsc_frame *frame;
+        u32 max_cnt;
+
+        max_cnt = (reqbufs->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) ?
+                gsc->variant->in_buf_cnt : gsc->variant->out_buf_cnt;
+        if (reqbufs->count > max_cnt) {
+                return -EINVAL;
+        } else if (reqbufs->count == 0) {
+                if (reqbufs->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
+                        gsc_ctx_state_lock_clear(GSC_SRC_FMT, ctx);
+                else
+                        gsc_ctx_state_lock_clear(GSC_DST_FMT, ctx);
+        }
+
+        frame = ctx_get_frame(ctx, reqbufs->type);
+
+        return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
+}
+
+static int gsc_m2m_querybuf(struct file *file, void *fh,
+                                        struct v4l2_buffer *buf)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+        return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
+}
+
+static int gsc_m2m_qbuf(struct file *file, void *fh,
+                          struct v4l2_buffer *buf)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+        return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
+}
+
+static int gsc_m2m_dqbuf(struct file *file, void *fh,
+                           struct v4l2_buffer *buf)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+        return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
+}
+
+static int gsc_m2m_streamon(struct file *file, void *fh,
+                           enum v4l2_buf_type type)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+
+        /* The source and target color format need to be set */
+        if (V4L2_TYPE_IS_OUTPUT(type)) {
+                if (!gsc_ctx_state_is_set(GSC_SRC_FMT, ctx))
+                        return -EINVAL;
+        } else if (!gsc_ctx_state_is_set(GSC_DST_FMT, ctx)) {
+                return -EINVAL;
+        }
+
+        return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
+}
+
+static int gsc_m2m_streamoff(struct file *file, void *fh,
+                            enum v4l2_buf_type type)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+        return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
+}
+
+/* Return 1 if rectangle a is enclosed in rectangle b, or 0 otherwise. */
+static int is_rectangle_enclosed(struct v4l2_rect *a, struct v4l2_rect *b)
+{
+        if (a->left < b->left || a->top < b->top)
+                return 0;
+
+        if (a->left + a->width > b->left + b->width)
+                return 0;
+
+        if (a->top + a->height > b->top + b->height)
+                return 0;
+
+        return 1;
+}
+
+static int gsc_m2m_g_selection(struct file *file, void *fh,
+                        struct v4l2_selection *s)
+{
+        struct gsc_frame *frame;
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+
+        if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
+            (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE))
+                return -EINVAL;
+
+        frame = ctx_get_frame(ctx, s->type);
+        if (IS_ERR(frame))
+                return PTR_ERR(frame);
+
+        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->f_width;
+                s->r.height = frame->f_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;
+        }
+
+        return -EINVAL;
+}
+
+static int gsc_m2m_s_selection(struct file *file, void *fh,
+                                struct v4l2_selection *s)
+{
+        struct gsc_frame *frame;
+        struct gsc_ctx *ctx = fh_to_ctx(fh);
+        struct v4l2_crop cr;
+        struct gsc_variant *variant = ctx->gsc_dev->variant;
+        int ret;
+
+        cr.type = s->type;
+        cr.c = s->r;
+
+        if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
+            (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE))
+                return -EINVAL;
+
+        ret = gsc_try_crop(ctx, &cr);
+        if (ret)
+                return ret;
+
+        if (s->flags & V4L2_SEL_FLAG_LE &&
+            !is_rectangle_enclosed(&cr.c, &s->r))
+                return -ERANGE;
+
+        if (s->flags & V4L2_SEL_FLAG_GE &&
+            !is_rectangle_enclosed(&s->r, &cr.c))
+                return -ERANGE;
+
+        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 (gsc_ctx_state_is_set(GSC_DST_FMT | GSC_SRC_FMT, ctx)) {
+                if (s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+                        ret = gsc_check_scaler_ratio(variant, cr.c.width,
+                                cr.c.height, ctx->d_frame.crop.width,
+                                ctx->d_frame.crop.height,
+                                ctx->gsc_ctrls.rotate->val, ctx->out_path);
+                } else {
+                        ret = gsc_check_scaler_ratio(variant,
+                                ctx->s_frame.crop.width,
+                                ctx->s_frame.crop.height, cr.c.width,
+                                cr.c.height, ctx->gsc_ctrls.rotate->val,
+                                ctx->out_path);
+                }
+
+                if (ret) {
+                        pr_err("Out of scaler range");
+                        return -EINVAL;
+                }
+        }
+
+        frame->crop = cr.c;
+
+        gsc_ctx_state_lock_set(GSC_PARAMS, ctx);
+        return 0;
+}
+
+static const struct v4l2_ioctl_ops gsc_m2m_ioctl_ops = {
+        .vidioc_querycap                = gsc_m2m_querycap,
+        .vidioc_enum_fmt_vid_cap_mplane = gsc_m2m_enum_fmt_mplane,
+        .vidioc_enum_fmt_vid_out_mplane = gsc_m2m_enum_fmt_mplane,
+        .vidioc_g_fmt_vid_cap_mplane    = gsc_m2m_g_fmt_mplane,
+        .vidioc_g_fmt_vid_out_mplane    = gsc_m2m_g_fmt_mplane,
+        .vidioc_try_fmt_vid_cap_mplane  = gsc_m2m_try_fmt_mplane,
+        .vidioc_try_fmt_vid_out_mplane  = gsc_m2m_try_fmt_mplane,
+        .vidioc_s_fmt_vid_cap_mplane    = gsc_m2m_s_fmt_mplane,
+        .vidioc_s_fmt_vid_out_mplane    = gsc_m2m_s_fmt_mplane,
+        .vidioc_reqbufs                 = gsc_m2m_reqbufs,
+        .vidioc_querybuf                = gsc_m2m_querybuf,
+        .vidioc_qbuf                    = gsc_m2m_qbuf,
+        .vidioc_dqbuf                   = gsc_m2m_dqbuf,
+        .vidioc_streamon                = gsc_m2m_streamon,
+        .vidioc_streamoff               = gsc_m2m_streamoff,
+        .vidioc_g_selection             = gsc_m2m_g_selection,
+        .vidioc_s_selection             = gsc_m2m_s_selection
+};
+
+static int queue_init(void *priv, struct vb2_queue *src_vq,
+                        struct vb2_queue *dst_vq)
+{
+        struct gsc_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;
+        src_vq->drv_priv = ctx;
+        src_vq->ops = &gsc_m2m_qops;
+        src_vq->mem_ops = &vb2_dma_contig_memops;
+        src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
+
+        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;
+        dst_vq->drv_priv = ctx;
+        dst_vq->ops = &gsc_m2m_qops;
+        dst_vq->mem_ops = &vb2_dma_contig_memops;
+        dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
+
+        return vb2_queue_init(dst_vq);
+}
+
+static int gsc_m2m_open(struct file *file)
+{
+        struct gsc_dev *gsc = video_drvdata(file);
+        struct gsc_ctx *ctx = NULL;
+        int ret;
+
+        pr_debug("pid: %d, state: 0x%lx", task_pid_nr(current), gsc->state);
+
+        if (mutex_lock_interruptible(&gsc->lock))
+                return -ERESTARTSYS;
+
+        ctx = kzalloc(sizeof (*ctx), GFP_KERNEL);
+        if (!ctx) {
+                ret = -ENOMEM;
+                goto unlock;
+        }
+
+        v4l2_fh_init(&ctx->fh, gsc->m2m.vfd);
+        ret = gsc_ctrls_create(ctx);
+        if (ret)
+                goto error_fh;
+
+        /* Use separate control handler per file handle */
+        ctx->fh.ctrl_handler = &ctx->ctrl_handler;
+        file->private_data = &ctx->fh;
+        v4l2_fh_add(&ctx->fh);
+
+        ctx->gsc_dev = gsc;
+        /* Default color format */
+        ctx->s_frame.fmt = get_format(0);
+        ctx->d_frame.fmt = get_format(0);
+        /* Setup the device context for mem2mem mode. */
+        ctx->state = GSC_CTX_M2M;
+        ctx->flags = 0;
+        ctx->in_path = GSC_DMA;
+        ctx->out_path = GSC_DMA;
+
+        ctx->m2m_ctx = v4l2_m2m_ctx_init(gsc->m2m.m2m_dev, ctx, queue_init);
+        if (IS_ERR(ctx->m2m_ctx)) {
+                pr_err("Failed to initialize m2m context");
+                ret = PTR_ERR(ctx->m2m_ctx);
+                goto error_ctrls;
+        }
+
+        if (gsc->m2m.refcnt++ == 0)
+                set_bit(ST_M2M_OPEN, &gsc->state);
+
+        pr_debug("gsc m2m driver is opened, ctx(0x%p)", ctx);
+
+        mutex_unlock(&gsc->lock);
+        return 0;
+
+error_ctrls:
+        gsc_ctrls_delete(ctx);
+error_fh:
+        v4l2_fh_del(&ctx->fh);
+        v4l2_fh_exit(&ctx->fh);
+        kfree(ctx);
+unlock:
+        mutex_unlock(&gsc->lock);
+        return ret;
+}
+
+static int gsc_m2m_release(struct file *file)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(file->private_data);
+        struct gsc_dev *gsc = ctx->gsc_dev;
+
+        pr_debug("pid: %d, state: 0x%lx, refcnt= %d",
+                task_pid_nr(current), gsc->state, gsc->m2m.refcnt);
+
+        if (mutex_lock_interruptible(&gsc->lock))
+                return -ERESTARTSYS;
+
+        v4l2_m2m_ctx_release(ctx->m2m_ctx);
+        gsc_ctrls_delete(ctx);
+        v4l2_fh_del(&ctx->fh);
+        v4l2_fh_exit(&ctx->fh);
+
+        if (--gsc->m2m.refcnt <= 0)
+                clear_bit(ST_M2M_OPEN, &gsc->state);
+        kfree(ctx);
+
+        mutex_unlock(&gsc->lock);
+        return 0;
+}
+
+static unsigned int gsc_m2m_poll(struct file *file,
+                                        struct poll_table_struct *wait)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(file->private_data);
+        struct gsc_dev *gsc = ctx->gsc_dev;
+        int ret;
+
+        if (mutex_lock_interruptible(&gsc->lock))
+                return -ERESTARTSYS;
+
+        ret = v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
+        mutex_unlock(&gsc->lock);
+
+        return ret;
+}
+
+static int gsc_m2m_mmap(struct file *file, struct vm_area_struct *vma)
+{
+        struct gsc_ctx *ctx = fh_to_ctx(file->private_data);
+        struct gsc_dev *gsc = ctx->gsc_dev;
+        int ret;
+
+        if (mutex_lock_interruptible(&gsc->lock))
+                return -ERESTARTSYS;
+
+        ret = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
+        mutex_unlock(&gsc->lock);
+
+        return ret;
+}
+
+static const struct v4l2_file_operations gsc_m2m_fops = {
+        .owner          = THIS_MODULE,
+        .open           = gsc_m2m_open,
+        .release        = gsc_m2m_release,
+        .poll           = gsc_m2m_poll,
+        .unlocked_ioctl = video_ioctl2,
+        .mmap           = gsc_m2m_mmap,
+};
+
+static struct v4l2_m2m_ops gsc_m2m_ops = {
+        .device_run     = gsc_m2m_device_run,
+        .job_abort      = gsc_m2m_job_abort,
+};
+
+int gsc_register_m2m_device(struct gsc_dev *gsc)
+{
+        struct platform_device *pdev;
+        int ret;
+
+        if (!gsc)
+                return -ENODEV;
+
+        pdev = gsc->pdev;
+
+        gsc->vdev.fops          = &gsc_m2m_fops;
+        gsc->vdev.ioctl_ops     = &gsc_m2m_ioctl_ops;
+        gsc->vdev.release       = video_device_release_empty;
+        gsc->vdev.lock          = &gsc->lock;
+        snprintf(gsc->vdev.name, sizeof(gsc->vdev.name), "%s.%d:m2m",
+                                        GSC_MODULE_NAME, gsc->id);
+
+        video_set_drvdata(&gsc->vdev, gsc);
+
+        gsc->m2m.vfd = &gsc->vdev;
+        gsc->m2m.m2m_dev = v4l2_m2m_init(&gsc_m2m_ops);
+        if (IS_ERR(gsc->m2m.m2m_dev)) {
+                dev_err(&pdev->dev, "failed to initialize v4l2-m2m device\n");
+                ret = PTR_ERR(gsc->m2m.m2m_dev);
+                goto err_m2m_r1;
+        }
+
+        ret = video_register_device(&gsc->vdev, VFL_TYPE_GRABBER, -1);
+        if (ret) {
+                dev_err(&pdev->dev,
+                         "%s(): failed to register video device\n", __func__);
+                goto err_m2m_r2;
+        }
+
+        pr_debug("gsc m2m driver registered as /dev/video%d", gsc->vdev.num);
+        return 0;
+
+err_m2m_r2:
+        v4l2_m2m_release(gsc->m2m.m2m_dev);
+err_m2m_r1:
+        video_device_release(gsc->m2m.vfd);
+
+        return ret;
+}
+
+void gsc_unregister_m2m_device(struct gsc_dev *gsc)
+{
+        if (gsc)
+                v4l2_m2m_release(gsc->m2m.m2m_dev);
+}