[media] exynos-gsc: Support dmabuf export buffer

This patch adds the dmabuf export buffer feature to the
Exynos G-Scaler driver.
Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/exynos-gsc/gsc-m2m.c

@@ -373,6 +373,13 @@ static int gsc_m2m_reqbufs(struct file *file, void *fh,
 	return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
 }
 
+static int gsc_m2m_expbuf(struct file *file, void *fh,
+				struct v4l2_exportbuffer *eb)
+{
+	struct gsc_ctx *ctx = fh_to_ctx(fh);
+	return v4l2_m2m_expbuf(file, ctx->m2m_ctx, eb);
+}
+
 static int gsc_m2m_querybuf(struct file *file, void *fh,
 					struct v4l2_buffer *buf)
 {
@@ -554,6 +561,7 @@ static const struct v4l2_ioctl_ops gsc_m2m_ioctl_ops = {
 	.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_expbuf                  = gsc_m2m_expbuf,
 	.vidioc_querybuf		= gsc_m2m_querybuf,
 	.vidioc_qbuf			= gsc_m2m_qbuf,
 	.vidioc_dqbuf			= gsc_m2m_dqbuf,
@@ -571,7 +579,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq,
 
 	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->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 	src_vq->drv_priv = ctx;
 	src_vq->ops = &gsc_m2m_qops;
 	src_vq->mem_ops = &vb2_dma_contig_memops;
@@ -583,7 +591,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq,
 
 	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->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 	dst_vq->drv_priv = ctx;
 	dst_vq->ops = &gsc_m2m_qops;
 	dst_vq->mem_ops = &vb2_dma_contig_memops;