diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-dvt/allegro-core.c
index 11333f900302..dc2627df0eec 100644
--- a/drivers/staging/media/allegro-dvt/allegro-core.c
+++ b/drivers/staging/media/allegro-dvt/allegro-core.c
@@ -612,49 +612,34 @@ static struct allegro_mbox *allegro_mbox_init(struct allegro_dev *dev,
 	return mbox;
 }
 
-static int allegro_mbox_write(struct allegro_dev *dev,
-			      struct allegro_mbox *mbox, void *src, size_t size)
+static int allegro_mbox_write(struct allegro_mbox *mbox,
+			      const u32 *src, size_t size)
 {
-	struct mcu_msg_header *header = src;
+	struct regmap *sram = mbox->dev->sram;
 	unsigned int tail;
 	size_t size_no_wrap;
 	int err = 0;
+	int stride = regmap_get_reg_stride(sram);
 
 	if (!src)
 		return -EINVAL;
 
-	if (size > mbox->size) {
-		v4l2_err(&dev->v4l2_dev,
-			 "message (%zu bytes) too large for mailbox (%zu bytes)\n",
-			 size, mbox->size);
+	if (size > mbox->size)
 		return -EINVAL;
-	}
-
-	if (header->length != size - sizeof(*header)) {
-		v4l2_err(&dev->v4l2_dev,
-			 "invalid message length: %u bytes (expected %zu bytes)\n",
-			 header->length, size - sizeof(*header));
-		return -EINVAL;
-	}
-
-	v4l2_dbg(2, debug, &dev->v4l2_dev,
-		 "write command message: type %s, body length %d\n",
-		 msg_type_name(header->type), header->length);
 
 	mutex_lock(&mbox->lock);
-	regmap_read(dev->sram, mbox->tail, &tail);
+	regmap_read(sram, mbox->tail, &tail);
 	if (tail > mbox->size) {
-		v4l2_err(&dev->v4l2_dev,
-			 "invalid tail (0x%x): must be smaller than mailbox size (0x%zx)\n",
-			 tail, mbox->size);
 		err = -EIO;
 		goto out;
 	}
 	size_no_wrap = min(size, mbox->size - (size_t)tail);
-	regmap_bulk_write(dev->sram, mbox->data + tail, src, size_no_wrap / 4);
-	regmap_bulk_write(dev->sram, mbox->data,
-			  src + size_no_wrap, (size - size_no_wrap) / 4);
-	regmap_write(dev->sram, mbox->tail, (tail + size) % mbox->size);
+	regmap_bulk_write(sram, mbox->data + tail,
+			  src, size_no_wrap / stride);
+	regmap_bulk_write(sram, mbox->data,
+			  src + (size_no_wrap / sizeof(*src)),
+			  (size - size_no_wrap) / stride);
+	regmap_write(sram, mbox->tail, (tail + size) % mbox->size);
 
 out:
 	mutex_unlock(&mbox->lock);
@@ -662,40 +647,32 @@ out:
 	return err;
 }
 
-static ssize_t allegro_mbox_read(struct allegro_dev *dev,
-				 struct allegro_mbox *mbox,
-				 void *dst, size_t nbyte)
+static ssize_t allegro_mbox_read(struct allegro_mbox *mbox,
+				 u32 *dst, size_t nbyte)
 {
-	struct mcu_msg_header *header;
+	struct {
+		u16 length;
+		u16 type;
+	} __attribute__ ((__packed__)) *header;
+	struct regmap *sram = mbox->dev->sram;
 	unsigned int head;
 	ssize_t size;
 	size_t body_no_wrap;
+	int stride = regmap_get_reg_stride(sram);
 
-	regmap_read(dev->sram, mbox->head, &head);
-	if (head > mbox->size) {
-		v4l2_err(&dev->v4l2_dev,
-			 "invalid head (0x%x): must be smaller than mailbox size (0x%zx)\n",
-			 head, mbox->size);
+	regmap_read(sram, mbox->head, &head);
+	if (head > mbox->size)
 		return -EIO;
-	}
 
 	/* Assume that the header does not wrap. */
-	regmap_bulk_read(dev->sram, mbox->data + head,
-			 dst, sizeof(*header) / 4);
-	header = dst;
+	regmap_bulk_read(sram, mbox->data + head,
+			 dst, sizeof(*header) / stride);
+	header = (void *)dst;
 	size = header->length + sizeof(*header);
-	if (size > mbox->size || size & 0x3) {
-		v4l2_err(&dev->v4l2_dev,
-			 "invalid message length: %zu bytes (maximum %zu bytes)\n",
-			 header->length + sizeof(*header), mbox->size);
+	if (size > mbox->size || size & 0x3)
 		return -EIO;
-	}
-	if (size > nbyte) {
-		v4l2_err(&dev->v4l2_dev,
-			 "destination buffer too small: %zu bytes (need %zu bytes)\n",
-			 nbyte, size);
+	if (size > nbyte)
 		return -EINVAL;
-	}
 
 	/*
 	 * The message might wrap within the mailbox. If the message does not
@@ -708,17 +685,14 @@ static ssize_t allegro_mbox_read(struct allegro_dev *dev,
 	 */
 	body_no_wrap = min((size_t)header->length,
 			   (size_t)(mbox->size - (head + sizeof(*header))));
-	regmap_bulk_read(dev->sram, mbox->data + head + sizeof(*header),
-			 dst + sizeof(*header), body_no_wrap / 4);
-	regmap_bulk_read(dev->sram, mbox->data,
-			 dst + sizeof(*header) + body_no_wrap,
-			 (header->length - body_no_wrap) / 4);
+	regmap_bulk_read(sram, mbox->data + head + sizeof(*header),
+			 dst + (sizeof(*header) / sizeof(*dst)),
+			 body_no_wrap / stride);
+	regmap_bulk_read(sram, mbox->data,
+			 dst + (sizeof(*header) + body_no_wrap) / sizeof(*dst),
+			 (header->length - body_no_wrap) / stride);
 
-	regmap_write(dev->sram, mbox->head, (head + size) % mbox->size);
-
-	v4l2_dbg(2, debug, &dev->v4l2_dev,
-		 "read status message: type %s, body length %d\n",
-		 msg_type_name(header->type), header->length);
+	regmap_write(sram, mbox->head, (head + size) % mbox->size);
 
 	return size;
 }
@@ -735,7 +709,7 @@ static int allegro_mbox_send(struct allegro_mbox *mbox, void *msg)
 	ssize_t size = sizeof(*header) + header->length;
 	int err;
 
-	err = allegro_mbox_write(dev, mbox, msg, size);
+	err = allegro_mbox_write(mbox, msg, size);
 	if (err)
 		goto out;
 
@@ -759,7 +733,7 @@ static void allegro_mbox_notify(struct allegro_mbox *mbox)
 	if (!msg)
 		return;
 
-	size = allegro_mbox_read(dev, mbox, msg, sizeof(*msg));
+	size = allegro_mbox_read(mbox, (u32 *)msg, sizeof(*msg));
 	if (size < 0)
 		goto out;
 
@@ -1604,12 +1578,6 @@ allegro_handle_create_channel(struct allegro_dev *dev,
 	struct allegro_channel *channel;
 	int err = 0;
 
-	if (msg->header.length != sizeof(*msg) - sizeof(msg->header))
-		v4l2_warn(&dev->v4l2_dev,
-			  "received message has %d bytes, but expected %zu\n",
-			  msg->header.length,
-			  sizeof(*msg) - sizeof(msg->header));
-
 	channel = allegro_find_channel_by_user_id(dev, msg->user_id);
 	if (IS_ERR(channel)) {
 		v4l2_warn(&dev->v4l2_dev,
@@ -1703,12 +1671,6 @@ allegro_handle_encode_frame(struct allegro_dev *dev,
 {
 	struct allegro_channel *channel;
 
-	if (msg->header.length != sizeof(*msg) - sizeof(msg->header))
-		v4l2_warn(&dev->v4l2_dev,
-			  "received message has %d bytes, but expected %zu\n",
-			  msg->header.length,
-			  sizeof(*msg) - sizeof(msg->header));
-
 	channel = allegro_find_channel_by_channel_id(dev, msg->channel_id);
 	if (IS_ERR(channel)) {
 		v4l2_err(&dev->v4l2_dev,