1 files changed, 668 insertions, 546 deletions

diff --git a/drivers/media/video/mx2_camera.c b/drivers/media/video/mx2_camera.c
index 04aab0c538aa..18afaeeadb7b 100644
--- a/drivers/media/video/mx2_camera.c
+++ b/drivers/media/video/mx2_camera.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2008, Sascha Hauer, Pengutronix
  * Copyright (C) 2010, Baruch Siach, Orex Computed Radiography
+ * Copyright (C) 2012, Javier Martin, Vista Silicon S.L.
  *
  * 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
@@ -18,6 +19,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
+#include <linux/gcd.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
@@ -30,17 +32,14 @@
 
 #include <media/v4l2-common.h>
 #include <media/v4l2-dev.h>
-#include <media/videobuf-core.h>
-#include <media/videobuf-dma-contig.h>
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-dma-contig.h>
 #include <media/soc_camera.h>
 #include <media/soc_mediabus.h>
 
 #include <linux/videodev2.h>
 
 #include <mach/mx2_cam.h>
-#ifdef CONFIG_MACH_MX27
-#include <mach/dma-mx1-mx2.h>
-#endif
 #include <mach/hardware.h>
 
 #include <asm/dma.h>
@@ -206,10 +205,23 @@
 #define PRP_INTR_LBOVF		(1 << 7)
 #define PRP_INTR_CH2OVF		(1 << 8)
 
-#define mx27_camera_emma(pcdev)	(cpu_is_mx27() && pcdev->use_emma)
+/* Resizing registers */
+#define PRP_RZ_VALID_TBL_LEN(x)	((x) << 24)
+#define PRP_RZ_VALID_BILINEAR	(1 << 31)
 
 #define MAX_VIDEO_MEM	16
 
+#define RESIZE_NUM_MIN	1
+#define RESIZE_NUM_MAX	20
+#define BC_COEF		3
+#define SZ_COEF		(1 << BC_COEF)
+
+#define RESIZE_DIR_H	0
+#define RESIZE_DIR_V	1
+
+#define RESIZE_ALGO_BILINEAR 0
+#define RESIZE_ALGO_AVERAGING 1
+
 struct mx2_prp_cfg {
 	int channel;
 	u32 in_fmt;
@@ -219,6 +231,13 @@ struct mx2_prp_cfg {
 	u32 irq_flags;
 };
 
+/* prp resizing parameters */
+struct emma_prp_resize {
+	int		algo; /* type of algorithm used */
+	int		len; /* number of coefficients */
+	unsigned char	s[RESIZE_NUM_MAX]; /* table of coefficients */
+};
+
 /* prp configuration for a client-host fmt pair */
 struct mx2_fmt_cfg {
 	enum v4l2_mbus_pixelcode	in_fmt;
@@ -226,6 +245,26 @@ struct mx2_fmt_cfg {
 	struct mx2_prp_cfg		cfg;
 };
 
+enum mx2_buffer_state {
+	MX2_STATE_QUEUED,
+	MX2_STATE_ACTIVE,
+	MX2_STATE_DONE,
+};
+
+struct mx2_buf_internal {
+	struct list_head	queue;
+	int			bufnum;
+	bool			discard;
+};
+
+/* buffer for one video frame */
+struct mx2_buffer {
+	/* common v4l buffer stuff -- must be first */
+	struct vb2_buffer		vb;
+	enum mx2_buffer_state		state;
+	struct mx2_buf_internal		internal;
+};
+
 struct mx2_camera_dev {
 	struct device		*dev;
 	struct soc_camera_host	soc_host;
@@ -242,6 +281,7 @@ struct mx2_camera_dev {
 
 	struct list_head	capture;
 	struct list_head	active_bufs;
+	struct list_head	discard;
 
 	spinlock_t		lock;
 
@@ -250,26 +290,23 @@ struct mx2_camera_dev {
 	struct mx2_buffer	*fb1_active;
 	struct mx2_buffer	*fb2_active;
 
-	int			use_emma;
-
 	u32			csicr1;
 
+	struct mx2_buf_internal buf_discard[2];
 	void			*discard_buffer;
 	dma_addr_t		discard_buffer_dma;
 	size_t			discard_size;
 	struct mx2_fmt_cfg	*emma_prp;
+	struct emma_prp_resize	resizing[2];
+	unsigned int		s_width, s_height;
 	u32			frame_count;
+	struct vb2_alloc_ctx	*alloc_ctx;
 };
 
-/* buffer for one video frame */
-struct mx2_buffer {
-	/* common v4l buffer stuff -- must be first */
-	struct videobuf_buffer		vb;
-
-	enum v4l2_mbus_pixelcode	code;
-
-	int bufnum;
-};
+static struct mx2_buffer *mx2_ibuf_to_buf(struct mx2_buf_internal *int_buf)
+{
+	return container_of(int_buf, struct mx2_buffer, internal);
+}
 
 static struct mx2_fmt_cfg mx27_emma_prp_table[] = {
 	/*
@@ -324,13 +361,36 @@ static struct mx2_fmt_cfg *mx27_emma_prp_get_format(
 	return &mx27_emma_prp_table[0];
 };
 
+static void mx27_update_emma_buf(struct mx2_camera_dev *pcdev,
+				 unsigned long phys, int bufnum)
+{
+	struct mx2_fmt_cfg *prp = pcdev->emma_prp;
+
+	if (prp->cfg.channel == 1) {
+		writel(phys, pcdev->base_emma +
+				PRP_DEST_RGB1_PTR + 4 * bufnum);
+	} else {
+		writel(phys, pcdev->base_emma +
+			PRP_DEST_Y_PTR - 0x14 * bufnum);
+		if (prp->out_fmt == V4L2_PIX_FMT_YUV420) {
+			u32 imgsize = pcdev->icd->user_height *
+					pcdev->icd->user_width;
+
+			writel(phys + imgsize, pcdev->base_emma +
+				PRP_DEST_CB_PTR - 0x14 * bufnum);
+			writel(phys + ((5 * imgsize) / 4), pcdev->base_emma +
+				PRP_DEST_CR_PTR - 0x14 * bufnum);
+		}
+	}
+}
+
 static void mx2_camera_deactivate(struct mx2_camera_dev *pcdev)
 {
 	unsigned long flags;
 
 	clk_disable(pcdev->clk_csi);
 	writel(0, pcdev->base_csi + CSICR1);
-	if (mx27_camera_emma(pcdev)) {
+	if (cpu_is_mx27()) {
 		writel(0, pcdev->base_emma + PRP_CNTL);
 	} else if (cpu_is_mx25()) {
 		spin_lock_irqsave(&pcdev->lock, flags);
@@ -362,7 +422,7 @@ static int mx2_camera_add_device(struct soc_camera_device *icd)
 
 	csicr1 = CSICR1_MCLKEN;
 
-	if (mx27_camera_emma(pcdev)) {
+	if (cpu_is_mx27()) {
 		csicr1 |= CSICR1_PRP_IF_EN | CSICR1_FCC |
 			CSICR1_RXFF_LEVEL(0);
 	} else if (cpu_is_mx27())
@@ -392,56 +452,13 @@ static void mx2_camera_remove_device(struct soc_camera_device *icd)
 
 	mx2_camera_deactivate(pcdev);
 
-	if (pcdev->discard_buffer) {
-		dma_free_coherent(ici->v4l2_dev.dev, pcdev->discard_size,
-				pcdev->discard_buffer,
-				pcdev->discard_buffer_dma);
-		pcdev->discard_buffer = NULL;
-	}
-
 	pcdev->icd = NULL;
 }
 
-#ifdef CONFIG_MACH_MX27
-static void mx27_camera_dma_enable(struct mx2_camera_dev *pcdev)
-{
-	u32 tmp;
-
-	imx_dma_enable(pcdev->dma);
-
-	tmp = readl(pcdev->base_csi + CSICR1);
-	tmp |= CSICR1_RF_OR_INTEN;
-	writel(tmp, pcdev->base_csi + CSICR1);
-}
-
-static irqreturn_t mx27_camera_irq(int irq_csi, void *data)
-{
-	struct mx2_camera_dev *pcdev = data;
-	u32 status = readl(pcdev->base_csi + CSISR);
-
-	if (status & CSISR_SOF_INT && pcdev->active) {
-		u32 tmp;
-
-		tmp = readl(pcdev->base_csi + CSICR1);
-		writel(tmp | CSICR1_CLR_RXFIFO, pcdev->base_csi + CSICR1);
-		mx27_camera_dma_enable(pcdev);
-	}
-
-	writel(CSISR_SOF_INT | CSISR_RFF_OR_INT, pcdev->base_csi + CSISR);
-
-	return IRQ_HANDLED;
-}
-#else
-static irqreturn_t mx27_camera_irq(int irq_csi, void *data)
-{
-	return IRQ_NONE;
-}
-#endif /* CONFIG_MACH_MX27 */
-
 static void mx25_camera_frame_done(struct mx2_camera_dev *pcdev, int fb,
 		int state)
 {
-	struct videobuf_buffer *vb;
+	struct vb2_buffer *vb;
 	struct mx2_buffer *buf;
 	struct mx2_buffer **fb_active = fb == 1 ? &pcdev->fb1_active :
 		&pcdev->fb2_active;
@@ -454,25 +471,24 @@ static void mx25_camera_frame_done(struct mx2_camera_dev *pcdev, int fb,
 		goto out;
 
 	vb = &(*fb_active)->vb;
-	dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
-		vb, vb->baddr, vb->bsize);
+	dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%p %lu\n", __func__,
+		vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 
-	vb->state = state;
-	do_gettimeofday(&vb->ts);
-	vb->field_count++;
-
-	wake_up(&vb->done);
+	do_gettimeofday(&vb->v4l2_buf.timestamp);
+	vb->v4l2_buf.sequence++;
+	vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
 
 	if (list_empty(&pcdev->capture)) {
 		buf = NULL;
 		writel(0, pcdev->base_csi + fb_reg);
 	} else {
-		buf = list_entry(pcdev->capture.next, struct mx2_buffer,
-				vb.queue);
+		buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
+				internal.queue);
 		vb = &buf->vb;
-		list_del(&vb->queue);
-		vb->state = VIDEOBUF_ACTIVE;
-		writel(videobuf_to_dma_contig(vb), pcdev->base_csi + fb_reg);
+		list_del(&buf->internal.queue);
+		buf->state = MX2_STATE_ACTIVE;
+		writel(vb2_dma_contig_plane_dma_addr(vb, 0),
+		       pcdev->base_csi + fb_reg);
 	}
 
 	*fb_active = buf;
@@ -487,9 +503,9 @@ static irqreturn_t mx25_camera_irq(int irq_csi, void *data)
 	u32 status = readl(pcdev->base_csi + CSISR);
 
 	if (status & CSISR_DMA_TSF_FB1_INT)
-		mx25_camera_frame_done(pcdev, 1, VIDEOBUF_DONE);
+		mx25_camera_frame_done(pcdev, 1, MX2_STATE_DONE);
 	else if (status & CSISR_DMA_TSF_FB2_INT)
-		mx25_camera_frame_done(pcdev, 2, VIDEOBUF_DONE);
+		mx25_camera_frame_done(pcdev, 2, MX2_STATE_DONE);
 
 	/* FIXME: handle CSISR_RFF_OR_INT */
 
@@ -501,59 +517,50 @@ static irqreturn_t mx25_camera_irq(int irq_csi, void *data)
 /*
  *  Videobuf operations
  */
-static int mx2_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
-			      unsigned int *size)
+static int mx2_videobuf_setup(struct vb2_queue *vq,
+			const struct v4l2_format *fmt,
+			unsigned int *count, unsigned int *num_planes,
+			unsigned int sizes[], void *alloc_ctxs[])
 {
-	struct soc_camera_device *icd = vq->priv_data;
+	struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+	struct mx2_camera_dev *pcdev = ici->priv;
 	int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 			icd->current_fmt->host_fmt);
 
-	dev_dbg(icd->parent, "count=%d, size=%d\n", *count, *size);
+	dev_dbg(icd->parent, "count=%d, size=%d\n", *count, sizes[0]);
+
+	/* TODO: support for VIDIOC_CREATE_BUFS not ready */
+	if (fmt != NULL)
+		return -ENOTTY;
 
 	if (bytes_per_line < 0)
 		return bytes_per_line;
 
-	*size = bytes_per_line * icd->user_height;
+	alloc_ctxs[0] = pcdev->alloc_ctx;
+
+	sizes[0] = bytes_per_line * icd->user_height;
 
 	if (0 == *count)
 		*count = 32;
-	if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
-		*count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
+	if (!*num_planes &&
+	    sizes[0] * *count > MAX_VIDEO_MEM * 1024 * 1024)
+		*count = (MAX_VIDEO_MEM * 1024 * 1024) / sizes[0];
 
-	return 0;
-}
+	*num_planes = 1;
 
-static void free_buffer(struct videobuf_queue *vq, struct mx2_buffer *buf)
-{
-	struct soc_camera_device *icd = vq->priv_data;
-	struct videobuf_buffer *vb = &buf->vb;
-
-	dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
-		vb, vb->baddr, vb->bsize);
-
-	/*
-	 * This waits until this buffer is out of danger, i.e., until it is no
-	 * longer in state VIDEOBUF_QUEUED or VIDEOBUF_ACTIVE
-	 */
-	videobuf_waiton(vq, vb, 0, 0);
-
-	videobuf_dma_contig_free(vq, vb);
-	dev_dbg(icd->parent, "%s freed\n", __func__);
-
-	vb->state = VIDEOBUF_NEEDS_INIT;
+	return 0;
 }
 
-static int mx2_videobuf_prepare(struct videobuf_queue *vq,
-		struct videobuf_buffer *vb, enum v4l2_field field)
+static int mx2_videobuf_prepare(struct vb2_buffer *vb)
 {
-	struct soc_camera_device *icd = vq->priv_data;
-	struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb);
+	struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
 	int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 			icd->current_fmt->host_fmt);
 	int ret = 0;
 
-	dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
-		vb, vb->baddr, vb->bsize);
+	dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
+		vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 
 	if (bytes_per_line < 0)
 		return bytes_per_line;
@@ -563,99 +570,58 @@ static int mx2_videobuf_prepare(struct videobuf_queue *vq,
 	 * This can be useful if you want to see if we actually fill
 	 * the buffer with something
 	 */
-	memset((void *)vb->baddr, 0xaa, vb->bsize);
+	memset((void *)vb2_plane_vaddr(vb, 0),
+	       0xaa, vb2_get_plane_payload(vb, 0));
 #endif
 
-	if (buf->code	!= icd->current_fmt->code ||
-	    vb->width	!= icd->user_width ||
-	    vb->height	!= icd->user_height ||
-	    vb->field	!= field) {
-		buf->code	= icd->current_fmt->code;
-		vb->width	= icd->user_width;
-		vb->height	= icd->user_height;
-		vb->field	= field;
-		vb->state	= VIDEOBUF_NEEDS_INIT;
-	}
-
-	vb->size = bytes_per_line * vb->height;
-	if (vb->baddr && vb->bsize < vb->size) {
+	vb2_set_plane_payload(vb, 0, bytes_per_line * icd->user_height);
+	if (vb2_plane_vaddr(vb, 0) &&
+	    vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
 		ret = -EINVAL;
 		goto out;
 	}
 
-	if (vb->state == VIDEOBUF_NEEDS_INIT) {
-		ret = videobuf_iolock(vq, vb, NULL);
-		if (ret)
-			goto fail;
-
-		vb->state = VIDEOBUF_PREPARED;
-	}
-
 	return 0;
 
-fail:
-	free_buffer(vq, buf);
 out:
 	return ret;
 }
 
-static void mx2_videobuf_queue(struct videobuf_queue *vq,
-			       struct videobuf_buffer *vb)
+static void mx2_videobuf_queue(struct vb2_buffer *vb)
 {
-	struct soc_camera_device *icd = vq->priv_data;
+	struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
 	struct soc_camera_host *ici =
 		to_soc_camera_host(icd->parent);
 	struct mx2_camera_dev *pcdev = ici->priv;
 	struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb);
 	unsigned long flags;
 
-	dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
-		vb, vb->baddr, vb->bsize);
+	dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
+		vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 
 	spin_lock_irqsave(&pcdev->lock, flags);
 
-	vb->state = VIDEOBUF_QUEUED;
-	list_add_tail(&vb->queue, &pcdev->capture);
+	buf->state = MX2_STATE_QUEUED;
+	list_add_tail(&buf->internal.queue, &pcdev->capture);
 
-	if (mx27_camera_emma(pcdev)) {
-		goto out;
-#ifdef CONFIG_MACH_MX27
-	} else if (cpu_is_mx27()) {
-		int ret;
-
-		if (pcdev->active == NULL) {
-			ret = imx_dma_setup_single(pcdev->dma,
-					videobuf_to_dma_contig(vb), vb->size,
-					(u32)pcdev->base_dma + 0x10,
-					DMA_MODE_READ);
-			if (ret) {
-				vb->state = VIDEOBUF_ERROR;
-				wake_up(&vb->done);
-				goto out;
-			}
-
-			vb->state = VIDEOBUF_ACTIVE;
-			pcdev->active = buf;
-		}
-#endif
-	} else { /* cpu_is_mx25() */
+	if (cpu_is_mx25()) {
 		u32 csicr3, dma_inten = 0;
 
 		if (pcdev->fb1_active == NULL) {
-			writel(videobuf_to_dma_contig(vb),
+			writel(vb2_dma_contig_plane_dma_addr(vb, 0),
 					pcdev->base_csi + CSIDMASA_FB1);
 			pcdev->fb1_active = buf;
 			dma_inten = CSICR1_FB1_DMA_INTEN;
 		} else if (pcdev->fb2_active == NULL) {
-			writel(videobuf_to_dma_contig(vb),
+			writel(vb2_dma_contig_plane_dma_addr(vb, 0),
 					pcdev->base_csi + CSIDMASA_FB2);
 			pcdev->fb2_active = buf;
 			dma_inten = CSICR1_FB2_DMA_INTEN;
 		}
 
 		if (dma_inten) {
-			list_del(&vb->queue);
-			vb->state = VIDEOBUF_ACTIVE;
+			list_del(&buf->internal.queue);
+			buf->state = MX2_STATE_ACTIVE;
 
 			csicr3 = readl(pcdev->base_csi + CSICR3);
 
@@ -674,36 +640,31 @@ static void mx2_videobuf_queue(struct videobuf_queue *vq,
 		}
 	}
 
-out:
 	spin_unlock_irqrestore(&pcdev->lock, flags);
 }
 
-static void mx2_videobuf_release(struct videobuf_queue *vq,
-				 struct videobuf_buffer *vb)
+static void mx2_videobuf_release(struct vb2_buffer *vb)
 {
-	struct soc_camera_device *icd = vq->priv_data;
+	struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 	struct mx2_camera_dev *pcdev = ici->priv;
 	struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb);
 	unsigned long flags;
 
 #ifdef DEBUG
-	dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
-		vb, vb->baddr, vb->bsize);
+	dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
+		vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 
-	switch (vb->state) {
-	case VIDEOBUF_ACTIVE:
+	switch (buf->state) {
+	case MX2_STATE_ACTIVE:
 		dev_info(icd->parent, "%s (active)\n", __func__);
 		break;
-	case VIDEOBUF_QUEUED:
+	case MX2_STATE_QUEUED:
 		dev_info(icd->parent, "%s (queued)\n", __func__);
 		break;
-	case VIDEOBUF_PREPARED:
-		dev_info(icd->parent, "%s (prepared)\n", __func__);
-		break;
 	default:
 		dev_info(icd->parent, "%s (unknown) %d\n", __func__,
-				vb->state);
+				buf->state);
 		break;
 	}
 #endif
@@ -717,11 +678,9 @@ static void mx2_videobuf_release(struct videobuf_queue *vq,
 	 * state. This requires a specific handling for each of the these DMA
 	 * types.
 	 */
+
 	spin_lock_irqsave(&pcdev->lock, flags);
-	if (vb->state == VIDEOBUF_QUEUED) {
-		list_del(&vb->queue);
-		vb->state = VIDEOBUF_ERROR;
-	} else if (cpu_is_mx25() && vb->state == VIDEOBUF_ACTIVE) {
+	if (cpu_is_mx25() && buf->state == MX2_STATE_ACTIVE) {
 		if (pcdev->fb1_active == buf) {
 			pcdev->csicr1 &= ~CSICR1_FB1_DMA_INTEN;
 			writel(0, pcdev->base_csi + CSIDMASA_FB1);
@@ -732,75 +691,178 @@ static void mx2_videobuf_release(struct videobuf_queue *vq,
 			pcdev->fb2_active = NULL;
 		}
 		writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
-		vb->state = VIDEOBUF_ERROR;
 	}
 	spin_unlock_irqrestore(&pcdev->lock, flags);
-
-	free_buffer(vq, buf);
 }
 
-static struct videobuf_queue_ops mx2_videobuf_ops = {
-	.buf_setup      = mx2_videobuf_setup,
-	.buf_prepare    = mx2_videobuf_prepare,
-	.buf_queue      = mx2_videobuf_queue,
-	.buf_release    = mx2_videobuf_release,
-};
-
-static void mx2_camera_init_videobuf(struct videobuf_queue *q,
-			      struct soc_camera_device *icd)
+static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
+		int bytesperline)
 {
-	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+	struct soc_camera_host *ici =
+		to_soc_camera_host(icd->parent);
 	struct mx2_camera_dev *pcdev = ici->priv;
+	struct mx2_fmt_cfg *prp = pcdev->emma_prp;
 
-	videobuf_queue_dma_contig_init(q, &mx2_videobuf_ops, pcdev->dev,
-			&pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
-			V4L2_FIELD_NONE, sizeof(struct mx2_buffer),
-			icd, &icd->video_lock);
-}
+	writel((pcdev->s_width << 16) | pcdev->s_height,
+	       pcdev->base_emma + PRP_SRC_FRAME_SIZE);
+	writel(prp->cfg.src_pixel,
+	       pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL);
+	if (prp->cfg.channel == 1) {
+		writel((icd->user_width << 16) | icd->user_height,
+			pcdev->base_emma + PRP_CH1_OUT_IMAGE_SIZE);
+		writel(bytesperline,
+			pcdev->base_emma + PRP_DEST_CH1_LINE_STRIDE);
+		writel(prp->cfg.ch1_pixel,
+			pcdev->base_emma + PRP_CH1_PIXEL_FORMAT_CNTL);
+	} else { /* channel 2 */
+		writel((icd->user_width << 16) | icd->user_height,
+			pcdev->base_emma + PRP_CH2_OUT_IMAGE_SIZE);
+	}
 
-#define MX2_BUS_FLAGS	(V4L2_MBUS_MASTER | \
-			V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
-			V4L2_MBUS_VSYNC_ACTIVE_LOW | \
-			V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
-			V4L2_MBUS_HSYNC_ACTIVE_LOW | \
-			V4L2_MBUS_PCLK_SAMPLE_RISING | \
-			V4L2_MBUS_PCLK_SAMPLE_FALLING | \
-			V4L2_MBUS_DATA_ACTIVE_HIGH | \
-			V4L2_MBUS_DATA_ACTIVE_LOW)
+	/* Enable interrupts */
+	writel(prp->cfg.irq_flags, pcdev->base_emma + PRP_INTR_CNTL);
+}
 
-static int mx27_camera_emma_prp_reset(struct mx2_camera_dev *pcdev)
+static void mx2_prp_resize_commit(struct mx2_camera_dev *pcdev)
 {
-	u32 cntl;
-	int count = 0;
+	int dir;
 
-	cntl = readl(pcdev->base_emma + PRP_CNTL);
-	writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL);
-	while (count++ < 100) {
-		if (!(readl(pcdev->base_emma + PRP_CNTL) & PRP_CNTL_SWRST))
-			return 0;
-		barrier();
-		udelay(1);
-	}
+	for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
+		unsigned char *s = pcdev->resizing[dir].s;
+		int len = pcdev->resizing[dir].len;
+		unsigned int coeff[2] = {0, 0};
+		unsigned int valid  = 0;
+		int i;
 
-	return -ETIMEDOUT;
+		if (len == 0)
+			continue;
+
+		for (i = RESIZE_NUM_MAX - 1; i >= 0; i--) {
+			int j;
+
+			j = i > 9 ? 1 : 0;
+			coeff[j] = (coeff[j] << BC_COEF) |
+					(s[i] & (SZ_COEF - 1));
+
+			if (i == 5 || i == 15)
+				coeff[j] <<= 1;
+
+			valid = (valid << 1) | (s[i] >> BC_COEF);
+		}
+
+		valid |= PRP_RZ_VALID_TBL_LEN(len);
+
+		if (pcdev->resizing[dir].algo == RESIZE_ALGO_BILINEAR)
+			valid |= PRP_RZ_VALID_BILINEAR;
+
+		if (pcdev->emma_prp->cfg.channel == 1) {
+			if (dir == RESIZE_DIR_H) {
+				writel(coeff[0], pcdev->base_emma +
+							PRP_CH1_RZ_HORI_COEF1);
+				writel(coeff[1], pcdev->base_emma +
+							PRP_CH1_RZ_HORI_COEF2);
+				writel(valid, pcdev->base_emma +
+							PRP_CH1_RZ_HORI_VALID);
+			} else {
+				writel(coeff[0], pcdev->base_emma +
+							PRP_CH1_RZ_VERT_COEF1);
+				writel(coeff[1], pcdev->base_emma +
+							PRP_CH1_RZ_VERT_COEF2);
+				writel(valid, pcdev->base_emma +
+							PRP_CH1_RZ_VERT_VALID);
+			}
+		} else {
+			if (dir == RESIZE_DIR_H) {
+				writel(coeff[0], pcdev->base_emma +
+							PRP_CH2_RZ_HORI_COEF1);
+				writel(coeff[1], pcdev->base_emma +
+							PRP_CH2_RZ_HORI_COEF2);
+				writel(valid, pcdev->base_emma +
+							PRP_CH2_RZ_HORI_VALID);
+			} else {
+				writel(coeff[0], pcdev->base_emma +
+							PRP_CH2_RZ_VERT_COEF1);
+				writel(coeff[1], pcdev->base_emma +
+							PRP_CH2_RZ_VERT_COEF2);
+				writel(valid, pcdev->base_emma +
+							PRP_CH2_RZ_VERT_VALID);
+			}
+		}
+	}
 }
 
-static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
-		int bytesperline)
+static int mx2_start_streaming(struct vb2_queue *q, unsigned int count)
 {
+	struct soc_camera_device *icd = soc_camera_from_vb2q(q);
 	struct soc_camera_host *ici =
 		to_soc_camera_host(icd->parent);
 	struct mx2_camera_dev *pcdev = ici->priv;
 	struct mx2_fmt_cfg *prp = pcdev->emma_prp;
-	u32 imgsize = pcdev->icd->user_height * pcdev->icd->user_width;
+	struct vb2_buffer *vb;
+	struct mx2_buffer *buf;
+	unsigned long phys;
+	int bytesperline;
 
-	if (prp->cfg.channel == 1) {
-		writel(pcdev->discard_buffer_dma,
-				pcdev->base_emma + PRP_DEST_RGB1_PTR);
-		writel(pcdev->discard_buffer_dma,
-				pcdev->base_emma + PRP_DEST_RGB2_PTR);
+	if (cpu_is_mx27()) {
+		unsigned long flags;
+		if (count < 2)
+			return -EINVAL;
+
+		spin_lock_irqsave(&pcdev->lock, flags);
+
+		buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
+				       internal.queue);
+		buf->internal.bufnum = 0;
+		vb = &buf->vb;
+		buf->state = MX2_STATE_ACTIVE;
+
+		phys = vb2_dma_contig_plane_dma_addr(vb, 0);
+		mx27_update_emma_buf(pcdev, phys, buf->internal.bufnum);
+		list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
+
+		buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
+				       internal.queue);
+		buf->internal.bufnum = 1;
+		vb = &buf->vb;
+		buf->state = MX2_STATE_ACTIVE;
 
-		writel(PRP_CNTL_CH1EN |
+		phys = vb2_dma_contig_plane_dma_addr(vb, 0);
+		mx27_update_emma_buf(pcdev, phys, buf->internal.bufnum);
+		list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
+
+		bytesperline = soc_mbus_bytes_per_line(icd->user_width,
+				icd->current_fmt->host_fmt);
+		if (bytesperline < 0)
+			return bytesperline;
+
+		/*
+		 * I didn't manage to properly enable/disable the prp
+		 * on a per frame basis during running transfers,
+		 * thus we allocate a buffer here and use it to
+		 * discard frames when no buffer is available.
+		 * Feel free to work on this ;)
+		 */
+		pcdev->discard_size = icd->user_height * bytesperline;
+		pcdev->discard_buffer = dma_alloc_coherent(ici->v4l2_dev.dev,
+				pcdev->discard_size, &pcdev->discard_buffer_dma,
+				GFP_KERNEL);
+		if (!pcdev->discard_buffer)
+			return -ENOMEM;
+
+		pcdev->buf_discard[0].discard = true;
+		list_add_tail(&pcdev->buf_discard[0].queue,
+				      &pcdev->discard);
+
+		pcdev->buf_discard[1].discard = true;
+		list_add_tail(&pcdev->buf_discard[1].queue,
+				      &pcdev->discard);
+
+		mx2_prp_resize_commit(pcdev);
+
+		mx27_camera_emma_buf_init(icd, bytesperline);
+
+		if (prp->cfg.channel == 1) {
+			writel(PRP_CNTL_CH1EN |
 				PRP_CNTL_CSIEN |
 				prp->cfg.in_fmt |
 				prp->cfg.out_fmt |
@@ -809,56 +871,107 @@ static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
 				PRP_CNTL_CH1_TSKIP(0) |
 				PRP_CNTL_IN_TSKIP(0),
 				pcdev->base_emma + PRP_CNTL);
+		} else {
+			writel(PRP_CNTL_CH2EN |
+				PRP_CNTL_CSIEN |
+				prp->cfg.in_fmt |
+				prp->cfg.out_fmt |
+				PRP_CNTL_CH2_LEN |
+				PRP_CNTL_CH2_TSKIP(0) |
+				PRP_CNTL_IN_TSKIP(0),
+				pcdev->base_emma + PRP_CNTL);
+		}
+		spin_unlock_irqrestore(&pcdev->lock, flags);
+	}
 
-		writel((icd->user_width << 16) | icd->user_height,
-			pcdev->base_emma + PRP_SRC_FRAME_SIZE);
-		writel((icd->user_width << 16) | icd->user_height,
-			pcdev->base_emma + PRP_CH1_OUT_IMAGE_SIZE);
-		writel(bytesperline,
-			pcdev->base_emma + PRP_DEST_CH1_LINE_STRIDE);
-		writel(prp->cfg.src_pixel,
-			pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL);
-		writel(prp->cfg.ch1_pixel,
-			pcdev->base_emma + PRP_CH1_PIXEL_FORMAT_CNTL);
-	} else { /* channel 2 */
-		writel(pcdev->discard_buffer_dma,
-			pcdev->base_emma + PRP_DEST_Y_PTR);
-		writel(pcdev->discard_buffer_dma,
-			pcdev->base_emma + PRP_SOURCE_Y_PTR);
-
-		if (prp->cfg.out_fmt == PRP_CNTL_CH2_OUT_YUV420) {
-			writel(pcdev->discard_buffer_dma + imgsize,
-				pcdev->base_emma + PRP_DEST_CB_PTR);
-			writel(pcdev->discard_buffer_dma + ((5 * imgsize) / 4),
-				pcdev->base_emma + PRP_DEST_CR_PTR);
-			writel(pcdev->discard_buffer_dma + imgsize,
-				pcdev->base_emma + PRP_SOURCE_CB_PTR);
-			writel(pcdev->discard_buffer_dma + ((5 * imgsize) / 4),
-				pcdev->base_emma + PRP_SOURCE_CR_PTR);
+	return 0;
+}
+
+static int mx2_stop_streaming(struct vb2_queue *q)
+{
+	struct soc_camera_device *icd = soc_camera_from_vb2q(q);
+	struct soc_camera_host *ici =
+		to_soc_camera_host(icd->parent);
+	struct mx2_camera_dev *pcdev = ici->priv;
+	struct mx2_fmt_cfg *prp = pcdev->emma_prp;
+	unsigned long flags;
+	void *b;
+	u32 cntl;
+
+	if (cpu_is_mx27()) {
+		spin_lock_irqsave(&pcdev->lock, flags);
+
+		cntl = readl(pcdev->base_emma + PRP_CNTL);
+		if (prp->cfg.channel == 1) {
+			writel(cntl & ~PRP_CNTL_CH1EN,
+			       pcdev->base_emma + PRP_CNTL);
+		} else {
+			writel(cntl & ~PRP_CNTL_CH2EN,
+			       pcdev->base_emma + PRP_CNTL);
 		}
+		INIT_LIST_HEAD(&pcdev->capture);
+		INIT_LIST_HEAD(&pcdev->active_bufs);
+		INIT_LIST_HEAD(&pcdev->discard);
 
-		writel(PRP_CNTL_CH2EN |
-			PRP_CNTL_CSIEN |
-			prp->cfg.in_fmt |
-			prp->cfg.out_fmt |
-			PRP_CNTL_CH2_LEN |
-			PRP_CNTL_CH2_TSKIP(0) |
-			PRP_CNTL_IN_TSKIP(0),
-			pcdev->base_emma + PRP_CNTL);
+		b = pcdev->discard_buffer;
+		pcdev->discard_buffer = NULL;
 
-		writel((icd->user_width << 16) | icd->user_height,
-			pcdev->base_emma + PRP_SRC_FRAME_SIZE);
+		spin_unlock_irqrestore(&pcdev->lock, flags);
 
-		writel((icd->user_width << 16) | icd->user_height,
-			pcdev->base_emma + PRP_CH2_OUT_IMAGE_SIZE);
+		dma_free_coherent(ici->v4l2_dev.dev,
+			pcdev->discard_size, b, pcdev->discard_buffer_dma);
+	}
 
-		writel(prp->cfg.src_pixel,
-			pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL);
+	return 0;
+}
+
+static struct vb2_ops mx2_videobuf_ops = {
+	.queue_setup	 = mx2_videobuf_setup,
+	.buf_prepare	 = mx2_videobuf_prepare,
+	.buf_queue	 = mx2_videobuf_queue,
+	.buf_cleanup	 = mx2_videobuf_release,
+	.start_streaming = mx2_start_streaming,
+	.stop_streaming	 = mx2_stop_streaming,
+};
+
+static int mx2_camera_init_videobuf(struct vb2_queue *q,
+			      struct soc_camera_device *icd)
+{
+	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	q->io_modes = VB2_MMAP | VB2_USERPTR;
+	q->drv_priv = icd;
+	q->ops = &mx2_videobuf_ops;
+	q->mem_ops = &vb2_dma_contig_memops;
+	q->buf_struct_size = sizeof(struct mx2_buffer);
+
+	return vb2_queue_init(q);
+}
 
+#define MX2_BUS_FLAGS	(V4L2_MBUS_MASTER | \
+			V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
+			V4L2_MBUS_VSYNC_ACTIVE_LOW | \
+			V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
+			V4L2_MBUS_HSYNC_ACTIVE_LOW | \
+			V4L2_MBUS_PCLK_SAMPLE_RISING | \
+			V4L2_MBUS_PCLK_SAMPLE_FALLING | \
+			V4L2_MBUS_DATA_ACTIVE_HIGH | \
+			V4L2_MBUS_DATA_ACTIVE_LOW)
+
+static int mx27_camera_emma_prp_reset(struct mx2_camera_dev *pcdev)
+{
+	u32 cntl;
+	int count = 0;
+
+	cntl = readl(pcdev->base_emma + PRP_CNTL);
+	writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL);
+	while (count++ < 100) {
+		if (!(readl(pcdev->base_emma + PRP_CNTL) & PRP_CNTL_SWRST))
+			return 0;
+		barrier();
+		udelay(1);
 	}
 
-	/* Enable interrupts */
-	writel(prp->cfg.irq_flags, pcdev->base_emma + PRP_INTR_CNTL);
+	return -ETIMEDOUT;
 }
 
 static int mx2_camera_set_bus_param(struct soc_camera_device *icd)
@@ -939,31 +1052,10 @@ static int mx2_camera_set_bus_param(struct soc_camera_device *icd)
 	if (bytesperline < 0)
 		return bytesperline;
 
-	if (mx27_camera_emma(pcdev)) {
+	if (cpu_is_mx27()) {
 		ret = mx27_camera_emma_prp_reset(pcdev);
 		if (ret)
 			return ret;
-
-		if (pcdev->discard_buffer)
-			dma_free_coherent(ici->v4l2_dev.dev,
-				pcdev->discard_size, pcdev->discard_buffer,
-				pcdev->discard_buffer_dma);
-
-		/*
-		 * I didn't manage to properly enable/disable the prp
-		 * on a per frame basis during running transfers,
-		 * thus we allocate a buffer here and use it to
-		 * discard frames when no buffer is available.
-		 * Feel free to work on this ;)
-		 */
-		pcdev->discard_size = icd->user_height * bytesperline;
-		pcdev->discard_buffer = dma_alloc_coherent(ici->v4l2_dev.dev,
-				pcdev->discard_size, &pcdev->discard_buffer_dma,
-				GFP_KERNEL);
-		if (!pcdev->discard_buffer)
-			return -ENOMEM;
-
-		mx27_camera_emma_buf_init(icd, bytesperline);
 	} else if (cpu_is_mx25()) {
 		writel((bytesperline * icd->user_height) >> 2,
 				pcdev->base_csi + CSIRXCNT);
@@ -1052,6 +1144,123 @@ static int mx2_camera_get_formats(struct soc_camera_device *icd,
 	return formats;
 }
 
+static int mx2_emmaprp_resize(struct mx2_camera_dev *pcdev,
+			      struct v4l2_mbus_framefmt *mf_in,
+			      struct v4l2_pix_format *pix_out, bool apply)
+{
+	int num, den;
+	unsigned long m;
+	int i, dir;
+
+	for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
+		struct emma_prp_resize tmprsz;
+		unsigned char *s = tmprsz.s;
+		int len = 0;
+		int in, out;
+
+		if (dir == RESIZE_DIR_H) {
+			in = mf_in->width;
+			out = pix_out->width;
+		} else {
+			in = mf_in->height;
+			out = pix_out->height;
+		}
+
+		if (in < out)
+			return -EINVAL;
+		else if (in == out)
+			continue;
+
+		/* Calculate ratio */
+		m = gcd(in, out);
+		num = in / m;
+		den = out / m;
+		if (num > RESIZE_NUM_MAX)
+			return -EINVAL;
+
+		if ((num >= 2 * den) && (den == 1) &&
+		    (num < 9) && (!(num & 0x01))) {
+			int sum = 0;
+			int j;
+
+			/* Average scaling for >= 2:1 ratios */
+			/* Support can be added for num >=9 and odd values */
+
+			tmprsz.algo = RESIZE_ALGO_AVERAGING;
+			len = num;
+
+			for (i = 0; i < (len / 2); i++)
+				s[i] = 8;
+
+			do {
+				for (i = 0; i < (len / 2); i++) {
+					s[i] = s[i] >> 1;
+					sum = 0;
+					for (j = 0; j < (len / 2); j++)
+						sum += s[j];
+					if (sum == 4)
+						break;
+				}
+			} while (sum != 4);
+
+			for (i = (len / 2); i < len; i++)
+				s[i] = s[len - i - 1];
+
+			s[len - 1] |= SZ_COEF;
+		} else {
+			/* bilinear scaling for < 2:1 ratios */
+			int v; /* overflow counter */
+			int coeff, nxt; /* table output */
+			int in_pos_inc = 2 * den;
+			int out_pos = num;
+			int out_pos_inc = 2 * num;
+			int init_carry = num - den;
+			int carry = init_carry;
+
+			tmprsz.algo = RESIZE_ALGO_BILINEAR;
+			v = den + in_pos_inc;
+			do {
+				coeff = v - out_pos;
+				out_pos += out_pos_inc;
+				carry += out_pos_inc;
+				for (nxt = 0; v < out_pos; nxt++) {
+					v += in_pos_inc;
+					carry -= in_pos_inc;
+				}
+
+				if (len > RESIZE_NUM_MAX)
+					return -EINVAL;
+
+				coeff = ((coeff << BC_COEF) +
+					(in_pos_inc >> 1)) / in_pos_inc;
+
+				if (coeff >= (SZ_COEF - 1))
+					coeff--;
+
+				coeff |= SZ_COEF;
+				s[len] = (unsigned char)coeff;
+				len++;
+
+				for (i = 1; i < nxt; i++) {
+					if (len >= RESIZE_NUM_MAX)
+						return -EINVAL;
+					s[len] = 0;
+					len++;
+				}
+			} while (carry != init_carry);
+		}
+		tmprsz.len = len;
+		if (dir == RESIZE_DIR_H)
+			mf_in->width = pix_out->width;
+		else
+			mf_in->height = pix_out->height;
+
+		if (apply)
+			memcpy(&pcdev->resizing[dir], &tmprsz, sizeof(tmprsz));
+	}
+	return 0;
+}
+
 static int mx2_camera_set_fmt(struct soc_camera_device *icd,
 			       struct v4l2_format *f)
 {
@@ -1063,6 +1272,9 @@ static int mx2_camera_set_fmt(struct soc_camera_device *icd,
 	struct v4l2_mbus_framefmt mf;
 	int ret;
 
+	dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
+		__func__, pix->width, pix->height);
+
 	xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
 	if (!xlate) {
 		dev_warn(icd->parent, "Format %x not found\n",
@@ -1080,6 +1292,22 @@ static int mx2_camera_set_fmt(struct soc_camera_device *icd,
 	if (ret < 0 && ret != -ENOIOCTLCMD)
 		return ret;
 
+	/* Store width and height returned by the sensor for resizing */
+	pcdev->s_width = mf.width;
+	pcdev->s_height = mf.height;
+	dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
+		__func__, pcdev->s_width, pcdev->s_height);
+
+	pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
+						   xlate->host_fmt->fourcc);
+
+	memset(pcdev->resizing, 0, sizeof(pcdev->resizing));
+	if ((mf.width != pix->width || mf.height != pix->height) &&
+		pcdev->emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
+		if (mx2_emmaprp_resize(pcdev, &mf, pix, true) < 0)
+			dev_dbg(icd->parent, "%s: can't resize\n", __func__);
+	}
+
 	if (mf.code != xlate->code)
 		return -EINVAL;
 
@@ -1089,9 +1317,8 @@ static int mx2_camera_set_fmt(struct soc_camera_device *icd,
 	pix->colorspace		= mf.colorspace;
 	icd->current_fmt	= xlate;
 
-	if (mx27_camera_emma(pcdev))
-		pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
-						xlate->host_fmt->fourcc);
+	dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
+		__func__, pix->width, pix->height);
 
 	return 0;
 }
@@ -1104,9 +1331,14 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
 	struct v4l2_pix_format *pix = &f->fmt.pix;
 	struct v4l2_mbus_framefmt mf;
 	__u32 pixfmt = pix->pixelformat;
+	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+	struct mx2_camera_dev *pcdev = ici->priv;
 	unsigned int width_limit;
 	int ret;
 
+	dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
+		__func__, pix->width, pix->height);
+
 	xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
 	if (pixfmt && !xlate) {
 		dev_warn(icd->parent, "Format %x not found\n", pixfmt);
@@ -1156,6 +1388,20 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
 	if (ret < 0)
 		return ret;
 
+	dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
+		__func__, pcdev->s_width, pcdev->s_height);
+
+	/* If the sensor does not support image size try PrP resizing */
+	pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
+						   xlate->host_fmt->fourcc);
+
+	memset(pcdev->resizing, 0, sizeof(pcdev->resizing));
+	if ((mf.width != pix->width || mf.height != pix->height) &&
+		pcdev->emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
+		if (mx2_emmaprp_resize(pcdev, &mf, pix, false) < 0)
+			dev_dbg(icd->parent, "%s: can't resize\n", __func__);
+	}
+
 	if (mf.field == V4L2_FIELD_ANY)
 		mf.field = V4L2_FIELD_NONE;
 	/*
@@ -1174,6 +1420,9 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
 	pix->field	= mf.field;
 	pix->colorspace	= mf.colorspace;
 
+	dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
+		__func__, pix->width, pix->height);
+
 	return 0;
 }
 
@@ -1187,136 +1436,11 @@ static int mx2_camera_querycap(struct soc_camera_host *ici,
 	return 0;
 }
 
-static int mx2_camera_reqbufs(struct soc_camera_device *icd,
-			      struct v4l2_requestbuffers *p)
-{
-	int i;
-
-	for (i = 0; i < p->count; i++) {
-		struct mx2_buffer *buf = container_of(icd->vb_vidq.bufs[i],
-						      struct mx2_buffer, vb);
-		INIT_LIST_HEAD(&buf->vb.queue);
-	}
-
-	return 0;
-}
-
-#ifdef CONFIG_MACH_MX27
-static void mx27_camera_frame_done(struct mx2_camera_dev *pcdev, int state)
-{
-	struct videobuf_buffer *vb;
-	struct mx2_buffer *buf;
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&pcdev->lock, flags);
-
-	if (!pcdev->active) {
-		dev_err(pcdev->dev, "%s called with no active buffer!\n",
-				__func__);
-		goto out;
-	}
-
-	vb = &pcdev->active->vb;
-	buf = container_of(vb, struct mx2_buffer, vb);
-	WARN_ON(list_empty(&vb->queue));
-	dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
-		vb, vb->baddr, vb->bsize);
-
-	/* _init is used to debug races, see comment in pxa_camera_reqbufs() */
-	list_del_init(&vb->queue);
-	vb->state = state;
-	do_gettimeofday(&vb->ts);
-	vb->field_count++;
-
-	wake_up(&vb->done);
-
-	if (list_empty(&pcdev->capture)) {
-		pcdev->active = NULL;
-		goto out;
-	}
-
-	pcdev->active = list_entry(pcdev->capture.next,
-			struct mx2_buffer, vb.queue);
-
-	vb = &pcdev->active->vb;
-	vb->state = VIDEOBUF_ACTIVE;
-
-	ret = imx_dma_setup_single(pcdev->dma, videobuf_to_dma_contig(vb),
-			vb->size, (u32)pcdev->base_dma + 0x10, DMA_MODE_READ);
-
-	if (ret) {
-		vb->state = VIDEOBUF_ERROR;
-		pcdev->active = NULL;
-		wake_up(&vb->done);
-	}
-
-out:
-	spin_unlock_irqrestore(&pcdev->lock, flags);
-}
-
-static void mx27_camera_dma_err_callback(int channel, void *data, int err)
-{
-	struct mx2_camera_dev *pcdev = data;
-
-	mx27_camera_frame_done(pcdev, VIDEOBUF_ERROR);
-}
-
-static void mx27_camera_dma_callback(int channel, void *data)
-{
-	struct mx2_camera_dev *pcdev = data;
-
-	mx27_camera_frame_done(pcdev, VIDEOBUF_DONE);
-}
-
-#define DMA_REQ_CSI_RX          31 /* FIXME: Add this to a resource */
-
-static int __devinit mx27_camera_dma_init(struct platform_device *pdev,
-		struct mx2_camera_dev *pcdev)
-{
-	int err;
-
-	pcdev->dma = imx_dma_request_by_prio("CSI RX DMA", DMA_PRIO_HIGH);
-	if (pcdev->dma < 0) {
-		dev_err(&pdev->dev, "%s failed to request DMA channel\n",
-				__func__);
-		return pcdev->dma;
-	}
-
-	err = imx_dma_setup_handlers(pcdev->dma, mx27_camera_dma_callback,
-					mx27_camera_dma_err_callback, pcdev);
-	if (err) {
-		dev_err(&pdev->dev, "%s failed to set DMA callback\n",
-				__func__);
-		goto err_out;
-	}
-
-	err = imx_dma_config_channel(pcdev->dma,
-			IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO,
-			IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
-			DMA_REQ_CSI_RX, 1);
-	if (err) {
-		dev_err(&pdev->dev, "%s failed to config DMA channel\n",
-				__func__);
-		goto err_out;
-	}
-
-	imx_dma_config_burstlen(pcdev->dma, 64);
-
-	return 0;
-
-err_out:
-	imx_dma_free(pcdev->dma);
-
-	return err;
-}
-#endif /* CONFIG_MACH_MX27 */
-
 static unsigned int mx2_camera_poll(struct file *file, poll_table *pt)
 {
 	struct soc_camera_device *icd = file->private_data;
 
-	return videobuf_poll_stream(file, &icd->vb_vidq, pt);
+	return vb2_poll(&icd->vb2_vidq, file, pt);
 }
 
 static struct soc_camera_host_ops mx2_soc_camera_host_ops = {
@@ -1327,144 +1451,148 @@ static struct soc_camera_host_ops mx2_soc_camera_host_ops = {
 	.set_crop	= mx2_camera_set_crop,
 	.get_formats	= mx2_camera_get_formats,
 	.try_fmt	= mx2_camera_try_fmt,
-	.init_videobuf	= mx2_camera_init_videobuf,
-	.reqbufs	= mx2_camera_reqbufs,
+	.init_videobuf2	= mx2_camera_init_videobuf,
 	.poll		= mx2_camera_poll,
 	.querycap	= mx2_camera_querycap,
 	.set_bus_param	= mx2_camera_set_bus_param,
 };
 
 static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev,
-		int bufnum, int state)
+		int bufnum, bool err)
 {
-	u32 imgsize = pcdev->icd->user_height * pcdev->icd->user_width;
+#ifdef DEBUG
 	struct mx2_fmt_cfg *prp = pcdev->emma_prp;
+#endif
+	struct mx2_buf_internal *ibuf;
 	struct mx2_buffer *buf;
-	struct videobuf_buffer *vb;
+	struct vb2_buffer *vb;
 	unsigned long phys;
 
-	if (!list_empty(&pcdev->active_bufs)) {
-		buf = list_entry(pcdev->active_bufs.next,
-			struct mx2_buffer, vb.queue);
+	ibuf = list_first_entry(&pcdev->active_bufs, struct mx2_buf_internal,
+			       queue);
+
+	BUG_ON(ibuf->bufnum != bufnum);
 
-		BUG_ON(buf->bufnum != bufnum);
+	if (ibuf->discard) {
+		/*
+		 * Discard buffer must not be returned to user space.
+		 * Just return it to the discard queue.
+		 */
+		list_move_tail(pcdev->active_bufs.next, &pcdev->discard);
+	} else {
+		buf = mx2_ibuf_to_buf(ibuf);
 
 		vb = &buf->vb;
 #ifdef DEBUG
-		phys = videobuf_to_dma_contig(vb);
+		phys = vb2_dma_contig_plane_dma_addr(vb, 0);
 		if (prp->cfg.channel == 1) {
 			if (readl(pcdev->base_emma + PRP_DEST_RGB1_PTR +
 				4 * bufnum) != phys) {
-				dev_err(pcdev->dev, "%p != %p\n", phys,
-						readl(pcdev->base_emma +
-							PRP_DEST_RGB1_PTR +
-							4 * bufnum));
+				dev_err(pcdev->dev, "%lx != %x\n", phys,
+					readl(pcdev->base_emma +
+					PRP_DEST_RGB1_PTR + 4 * bufnum));
 			}
 		} else {
 			if (readl(pcdev->base_emma + PRP_DEST_Y_PTR -
 				0x14 * bufnum) != phys) {
-				dev_err(pcdev->dev, "%p != %p\n", phys,
-						readl(pcdev->base_emma +
-							PRP_DEST_Y_PTR -
-							0x14 * bufnum));
+				dev_err(pcdev->dev, "%lx != %x\n", phys,
+					readl(pcdev->base_emma +
+					PRP_DEST_Y_PTR - 0x14 * bufnum));
 			}
 		}
 #endif
-		dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb,
-				vb->baddr, vb->bsize);
+		dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%p %lu\n", __func__, vb,
+				vb2_plane_vaddr(vb, 0),
+				vb2_get_plane_payload(vb, 0));
 
-		list_del(&vb->queue);
-		vb->state = state;
-		do_gettimeofday(&vb->ts);
-		vb->field_count = pcdev->frame_count * 2;
-		pcdev->frame_count++;
-
-		wake_up(&vb->done);
+		list_del_init(&buf->internal.queue);
+		do_gettimeofday(&vb->v4l2_buf.timestamp);
+		vb->v4l2_buf.sequence = pcdev->frame_count;
+		if (err)
+			vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+		else
+			vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
 	}
 
+	pcdev->frame_count++;
+
 	if (list_empty(&pcdev->capture)) {
-		if (prp->cfg.channel == 1) {
-			writel(pcdev->discard_buffer_dma, pcdev->base_emma +
-					PRP_DEST_RGB1_PTR + 4 * bufnum);
-		} else {
-			writel(pcdev->discard_buffer_dma, pcdev->base_emma +
-						PRP_DEST_Y_PTR -
-						0x14 * bufnum);
-			if (prp->out_fmt == V4L2_PIX_FMT_YUV420) {
-				writel(pcdev->discard_buffer_dma + imgsize,
-				       pcdev->base_emma + PRP_DEST_CB_PTR -
-				       0x14 * bufnum);
-				writel(pcdev->discard_buffer_dma +
-				       ((5 * imgsize) / 4), pcdev->base_emma +
-				       PRP_DEST_CR_PTR - 0x14 * bufnum);
-			}
+		if (list_empty(&pcdev->discard)) {
+			dev_warn(pcdev->dev, "%s: trying to access empty discard list\n",
+				 __func__);
+			return;
 		}
+
+		ibuf = list_first_entry(&pcdev->discard,
+					struct mx2_buf_internal, queue);
+		ibuf->bufnum = bufnum;
+
+		list_move_tail(pcdev->discard.next, &pcdev->active_bufs);
+		mx27_update_emma_buf(pcdev, pcdev->discard_buffer_dma, bufnum);
 		return;
 	}
 
-	buf = list_entry(pcdev->capture.next,
-			struct mx2_buffer, vb.queue);
+	buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
+			       internal.queue);
 
-	buf->bufnum = !bufnum;
+	buf->internal.bufnum = bufnum;
 
 	list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
 
 	vb = &buf->vb;
-	vb->state = VIDEOBUF_ACTIVE;
+	buf->state = MX2_STATE_ACTIVE;
 
-	phys = videobuf_to_dma_contig(vb);
-	if (prp->cfg.channel == 1) {
-		writel(phys, pcdev->base_emma + PRP_DEST_RGB1_PTR + 4 * bufnum);
-	} else {
-		writel(phys, pcdev->base_emma +
-				PRP_DEST_Y_PTR - 0x14 * bufnum);
-		if (prp->cfg.out_fmt == PRP_CNTL_CH2_OUT_YUV420) {
-			writel(phys + imgsize, pcdev->base_emma +
-					PRP_DEST_CB_PTR - 0x14 * bufnum);
-			writel(phys + ((5 * imgsize) / 4), pcdev->base_emma +
-					PRP_DEST_CR_PTR - 0x14 * bufnum);
-		}
-	}
+	phys = vb2_dma_contig_plane_dma_addr(vb, 0);
+	mx27_update_emma_buf(pcdev, phys, bufnum);
 }
 
 static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
 {
 	struct mx2_camera_dev *pcdev = data;
 	unsigned int status = readl(pcdev->base_emma + PRP_INTRSTATUS);
-	struct mx2_buffer *buf;
+	struct mx2_buf_internal *ibuf;
+
+	spin_lock(&pcdev->lock);
+
+	if (list_empty(&pcdev->active_bufs)) {
+		dev_warn(pcdev->dev, "%s: called while active list is empty\n",
+			__func__);
+
+		if (!status) {
+			spin_unlock(&pcdev->lock);
+			return IRQ_NONE;
+		}
+	}
 
 	if (status & (1 << 7)) { /* overflow */
-		u32 cntl;
-		/*
-		 * We only disable channel 1 here since this is the only
-		 * enabled channel
-		 *
-		 * FIXME: the correct DMA overflow handling should be resetting
-		 * the buffer, returning an error frame, and continuing with
-		 * the next one.
-		 */
-		cntl = readl(pcdev->base_emma + PRP_CNTL);
+		u32 cntl = readl(pcdev->base_emma + PRP_CNTL);
 		writel(cntl & ~(PRP_CNTL_CH1EN | PRP_CNTL_CH2EN),
 		       pcdev->base_emma + PRP_CNTL);
 		writel(cntl, pcdev->base_emma + PRP_CNTL);
-	}
-	if ((((status & (3 << 5)) == (3 << 5)) ||
-		((status & (3 << 3)) == (3 << 3)))
-			&& !list_empty(&pcdev->active_bufs)) {
+
+		ibuf = list_first_entry(&pcdev->active_bufs,
+					struct mx2_buf_internal, queue);
+		mx27_camera_frame_done_emma(pcdev,
+					ibuf->bufnum, true);
+
+		status &= ~(1 << 7);
+	} else if (((status & (3 << 5)) == (3 << 5)) ||
+		((status & (3 << 3)) == (3 << 3))) {
 		/*
 		 * Both buffers have triggered, process the one we're expecting
 		 * to first
 		 */
-		buf = list_entry(pcdev->active_bufs.next,
-			struct mx2_buffer, vb.queue);
-		mx27_camera_frame_done_emma(pcdev, buf->bufnum, VIDEOBUF_DONE);
-		status &= ~(1 << (6 - buf->bufnum)); /* mark processed */
+		ibuf = list_first_entry(&pcdev->active_bufs,
+					struct mx2_buf_internal, queue);
+		mx27_camera_frame_done_emma(pcdev, ibuf->bufnum, false);
+		status &= ~(1 << (6 - ibuf->bufnum)); /* mark processed */
+	} else if ((status & (1 << 6)) || (status & (1 << 4))) {
+		mx27_camera_frame_done_emma(pcdev, 0, false);
+	} else if ((status & (1 << 5)) || (status & (1 << 3))) {
+		mx27_camera_frame_done_emma(pcdev, 1, false);
 	}
-	if ((status & (1 << 6)) || (status & (1 << 4)))
-		mx27_camera_frame_done_emma(pcdev, 0, VIDEOBUF_DONE);
-	if ((status & (1 << 5)) || (status & (1 << 3)))
-		mx27_camera_frame_done_emma(pcdev, 1, VIDEOBUF_DONE);
 
+	spin_unlock(&pcdev->lock);
 	writel(status, pcdev->base_emma + PRP_INTRSTATUS);
 
 	return IRQ_HANDLED;
@@ -1527,8 +1655,6 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
 	struct resource *res_csi, *res_emma;
 	void __iomem *base_csi;
 	int irq_csi, irq_emma;
-	irq_handler_t mx2_cam_irq_handler = cpu_is_mx25() ? mx25_camera_irq
-		: mx27_camera_irq;
 	int err = 0;
 
 	dev_dbg(&pdev->dev, "initialising\n");
@@ -1550,22 +1676,11 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
 
 	pcdev->clk_csi = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(pcdev->clk_csi)) {
+		dev_err(&pdev->dev, "Could not get csi clock\n");
 		err = PTR_ERR(pcdev->clk_csi);
 		goto exit_kfree;
 	}
 
-	dev_dbg(&pdev->dev, "Camera clock frequency: %ld\n",
-			clk_get_rate(pcdev->clk_csi));
-
-	/* Initialize DMA */
-#ifdef CONFIG_MACH_MX27
-	if (cpu_is_mx27()) {
-		err = mx27_camera_dma_init(pdev, pcdev);
-		if (err)
-			goto exit_clk_put;
-	}
-#endif /* CONFIG_MACH_MX27 */
-
 	pcdev->res_csi = res_csi;
 	pcdev->pdata = pdev->dev.platform_data;
 	if (pcdev->pdata) {
@@ -1585,6 +1700,7 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
 
 	INIT_LIST_HEAD(&pcdev->capture);
 	INIT_LIST_HEAD(&pcdev->active_bufs);
+	INIT_LIST_HEAD(&pcdev->discard);
 	spin_lock_init(&pcdev->lock);
 
 	/*
@@ -1606,11 +1722,13 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
 	pcdev->base_dma = res_csi->start;
 	pcdev->dev = &pdev->dev;
 
-	err = request_irq(pcdev->irq_csi, mx2_cam_irq_handler, 0,
-			MX2_CAM_DRV_NAME, pcdev);
-	if (err) {
-		dev_err(pcdev->dev, "Camera interrupt register failed \n");
-		goto exit_iounmap;
+	if (cpu_is_mx25()) {
+		err = request_irq(pcdev->irq_csi, mx25_camera_irq, 0,
+				MX2_CAM_DRV_NAME, pcdev);
+		if (err) {
+			dev_err(pcdev->dev, "Camera interrupt register failed \n");
+			goto exit_iounmap;
+		}
 	}
 
 	if (cpu_is_mx27()) {
@@ -1618,14 +1736,15 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
 		res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 		irq_emma = platform_get_irq(pdev, 1);
 
-		if (res_emma && irq_emma >= 0) {
-			dev_info(&pdev->dev, "Using EMMA\n");
-			pcdev->use_emma = 1;
-			pcdev->res_emma = res_emma;
-			pcdev->irq_emma = irq_emma;
-			if (mx27_camera_emma_init(pcdev))
-				goto exit_free_irq;
+		if (!res_emma || !irq_emma) {
+			dev_err(&pdev->dev, "no EMMA resources\n");
+			goto exit_free_irq;
 		}
+
+		pcdev->res_emma = res_emma;
+		pcdev->irq_emma = irq_emma;
+		if (mx27_camera_emma_init(pcdev))
+			goto exit_free_irq;
 	}
 
 	pcdev->soc_host.drv_name	= MX2_CAM_DRV_NAME,
@@ -1633,6 +1752,12 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
 	pcdev->soc_host.priv		= pcdev;
 	pcdev->soc_host.v4l2_dev.dev	= &pdev->dev;
 	pcdev->soc_host.nr		= pdev->id;
+
+	pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
+	if (IS_ERR(pcdev->alloc_ctx)) {
+		err = PTR_ERR(pcdev->alloc_ctx);
+		goto eallocctx;
+	}
 	err = soc_camera_host_register(&pcdev->soc_host);
 	if (err)
 		goto exit_free_emma;
@@ -1643,26 +1768,24 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
 	return 0;
 
 exit_free_emma:
-	if (mx27_camera_emma(pcdev)) {
+	vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
+eallocctx:
+	if (cpu_is_mx27()) {
 		free_irq(pcdev->irq_emma, pcdev);
 		clk_disable(pcdev->clk_emma);
 		clk_put(pcdev->clk_emma);
 		iounmap(pcdev->base_emma);
-		release_mem_region(res_emma->start, resource_size(res_emma));
+		release_mem_region(pcdev->res_emma->start, resource_size(pcdev->res_emma));
 	}
 exit_free_irq:
-	free_irq(pcdev->irq_csi, pcdev);
+	if (cpu_is_mx25())
+		free_irq(pcdev->irq_csi, pcdev);
 exit_iounmap:
 	iounmap(base_csi);
 exit_release:
 	release_mem_region(res_csi->start, resource_size(res_csi));
 exit_dma_free:
-#ifdef CONFIG_MACH_MX27
-	if (cpu_is_mx27())
-		imx_dma_free(pcdev->dma);
-exit_clk_put:
 	clk_put(pcdev->clk_csi);
-#endif /* CONFIG_MACH_MX27 */
 exit_kfree:
 	kfree(pcdev);
 exit:
@@ -1677,19 +1800,18 @@ static int __devexit mx2_camera_remove(struct platform_device *pdev)
 	struct resource *res;
 
 	clk_put(pcdev->clk_csi);
-#ifdef CONFIG_MACH_MX27
+	if (cpu_is_mx25())
+		free_irq(pcdev->irq_csi, pcdev);
 	if (cpu_is_mx27())
-		imx_dma_free(pcdev->dma);
-#endif /* CONFIG_MACH_MX27 */
-	free_irq(pcdev->irq_csi, pcdev);
-	if (mx27_camera_emma(pcdev))
 		free_irq(pcdev->irq_emma, pcdev);
 
 	soc_camera_host_unregister(&pcdev->soc_host);
 
+	vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
+
 	iounmap(pcdev->base_csi);
 
-	if (mx27_camera_emma(pcdev)) {
+	if (cpu_is_mx27()) {
 		clk_disable(pcdev->clk_emma);
 		clk_put(pcdev->clk_emma);
 		iounmap(pcdev->base_emma);