1 files changed, 118 insertions, 112 deletions

diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
index 9ccd5ff55e19..b136844499f6 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -119,6 +119,15 @@
 #define VNDMR2_FTEV		(1 << 17)
 #define VNDMR2_VLV(n)		((n & 0xf) << 12)
 
+struct rvin_buffer {
+	struct vb2_v4l2_buffer vb;
+	struct list_head list;
+};
+
+#define to_buf_list(vb2_buffer) (&container_of(vb2_buffer, \
+					       struct rvin_buffer, \
+					       vb)->list)
+
 static void rvin_write(struct rvin_dev *vin, u32 value, u32 offset)
 {
 	iowrite32(value, vin->base + offset);
@@ -269,48 +278,6 @@ static int rvin_setup(struct rvin_dev *vin)
 	return 0;
 }
 
-static void rvin_capture_on(struct rvin_dev *vin)
-{
-	vin_dbg(vin, "Capture on in %s mode\n",
-		vin->continuous ? "continuous" : "single");
-
-	if (vin->continuous)
-		/* Continuous Frame Capture Mode */
-		rvin_write(vin, VNFC_C_FRAME, VNFC_REG);
-	else
-		/* Single Frame Capture Mode */
-		rvin_write(vin, VNFC_S_FRAME, VNFC_REG);
-}
-
-static void rvin_capture_off(struct rvin_dev *vin)
-{
-	/* Set continuous & single transfer off */
-	rvin_write(vin, 0, VNFC_REG);
-}
-
-static int rvin_capture_start(struct rvin_dev *vin)
-{
-	int ret;
-
-	rvin_crop_scale_comp(vin);
-
-	ret = rvin_setup(vin);
-	if (ret)
-		return ret;
-
-	rvin_capture_on(vin);
-
-	return 0;
-}
-
-static void rvin_capture_stop(struct rvin_dev *vin)
-{
-	rvin_capture_off(vin);
-
-	/* Disable module */
-	rvin_write(vin, rvin_read(vin, VNMC_REG) & ~VNMC_ME, VNMC_REG);
-}
-
 static void rvin_disable_interrupts(struct rvin_dev *vin)
 {
 	rvin_write(vin, 0, VNIE_REG);
@@ -377,6 +344,99 @@ static void rvin_set_slot_addr(struct rvin_dev *vin, int slot, dma_addr_t addr)
 	rvin_write(vin, offset, VNMB_REG(slot));
 }
 
+/* Moves a buffer from the queue to the HW slots */
+static bool rvin_fill_hw_slot(struct rvin_dev *vin, int slot)
+{
+	struct rvin_buffer *buf;
+	struct vb2_v4l2_buffer *vbuf;
+	dma_addr_t phys_addr_top;
+
+	if (vin->queue_buf[slot] != NULL)
+		return true;
+
+	if (list_empty(&vin->buf_list))
+		return false;
+
+	vin_dbg(vin, "Filling HW slot: %d\n", slot);
+
+	/* Keep track of buffer we give to HW */
+	buf = list_entry(vin->buf_list.next, struct rvin_buffer, list);
+	vbuf = &buf->vb;
+	list_del_init(to_buf_list(vbuf));
+	vin->queue_buf[slot] = vbuf;
+
+	/* Setup DMA */
+	phys_addr_top = vb2_dma_contig_plane_dma_addr(&vbuf->vb2_buf, 0);
+	rvin_set_slot_addr(vin, slot, phys_addr_top);
+
+	return true;
+}
+
+static bool rvin_fill_hw(struct rvin_dev *vin)
+{
+	int slot, limit;
+
+	limit = vin->continuous ? HW_BUFFER_NUM : 1;
+
+	for (slot = 0; slot < limit; slot++)
+		if (!rvin_fill_hw_slot(vin, slot))
+			return false;
+	return true;
+}
+
+static void rvin_capture_on(struct rvin_dev *vin)
+{
+	vin_dbg(vin, "Capture on in %s mode\n",
+		vin->continuous ? "continuous" : "single");
+
+	if (vin->continuous)
+		/* Continuous Frame Capture Mode */
+		rvin_write(vin, VNFC_C_FRAME, VNFC_REG);
+	else
+		/* Single Frame Capture Mode */
+		rvin_write(vin, VNFC_S_FRAME, VNFC_REG);
+}
+
+static int rvin_capture_start(struct rvin_dev *vin)
+{
+	struct rvin_buffer *buf, *node;
+	int bufs, ret;
+
+	/* Count number of free buffers */
+	bufs = 0;
+	list_for_each_entry_safe(buf, node, &vin->buf_list, list)
+		bufs++;
+
+	/* Continuous capture requires more buffers then there are HW slots */
+	vin->continuous = bufs > HW_BUFFER_NUM;
+
+	if (!rvin_fill_hw(vin)) {
+		vin_err(vin, "HW not ready to start, not enough buffers available\n");
+		return -EINVAL;
+	}
+
+	rvin_crop_scale_comp(vin);
+
+	ret = rvin_setup(vin);
+	if (ret)
+		return ret;
+
+	rvin_capture_on(vin);
+
+	vin->state = RUNNING;
+
+	return 0;
+}
+
+static void rvin_capture_stop(struct rvin_dev *vin)
+{
+	/* Set continuous & single transfer off */
+	rvin_write(vin, 0, VNFC_REG);
+
+	/* Disable module */
+	rvin_write(vin, rvin_read(vin, VNMC_REG) & ~VNMC_ME, VNMC_REG);
+}
+
 /* -----------------------------------------------------------------------------
  * Crop and Scaling Gen2
  */
@@ -839,61 +899,12 @@ void rvin_scale_try(struct rvin_dev *vin, struct v4l2_pix_format *pix,
 #define RVIN_TIMEOUT_MS 100
 #define RVIN_RETRIES 10
 
-struct rvin_buffer {
-	struct vb2_v4l2_buffer vb;
-	struct list_head list;
-};
-
-#define to_buf_list(vb2_buffer) (&container_of(vb2_buffer, \
-					       struct rvin_buffer, \
-					       vb)->list)
-
-/* Moves a buffer from the queue to the HW slots */
-static bool rvin_fill_hw_slot(struct rvin_dev *vin, int slot)
-{
-	struct rvin_buffer *buf;
-	struct vb2_v4l2_buffer *vbuf;
-	dma_addr_t phys_addr_top;
-
-	if (vin->queue_buf[slot] != NULL)
-		return true;
-
-	if (list_empty(&vin->buf_list))
-		return false;
-
-	vin_dbg(vin, "Filling HW slot: %d\n", slot);
-
-	/* Keep track of buffer we give to HW */
-	buf = list_entry(vin->buf_list.next, struct rvin_buffer, list);
-	vbuf = &buf->vb;
-	list_del_init(to_buf_list(vbuf));
-	vin->queue_buf[slot] = vbuf;
-
-	/* Setup DMA */
-	phys_addr_top = vb2_dma_contig_plane_dma_addr(&vbuf->vb2_buf, 0);
-	rvin_set_slot_addr(vin, slot, phys_addr_top);
-
-	return true;
-}
-
-static bool rvin_fill_hw(struct rvin_dev *vin)
-{
-	int slot, limit;
-
-	limit = vin->continuous ? HW_BUFFER_NUM : 1;
-
-	for (slot = 0; slot < limit; slot++)
-		if (!rvin_fill_hw_slot(vin, slot))
-			return false;
-	return true;
-}
-
 static irqreturn_t rvin_irq(int irq, void *data)
 {
 	struct rvin_dev *vin = data;
 	u32 int_status, vnms;
 	int slot;
-	unsigned int sequence, handled = 0;
+	unsigned int i, sequence, handled = 0;
 	unsigned long flags;
 
 	spin_lock_irqsave(&vin->qlock, flags);
@@ -955,8 +966,20 @@ static irqreturn_t rvin_irq(int irq, void *data)
 		 * the VnMBm registers.
 		 */
 		if (vin->continuous) {
-			rvin_capture_off(vin);
+			rvin_capture_stop(vin);
 			vin_dbg(vin, "IRQ %02d: hw not ready stop\n", sequence);
+
+			/* Maybe we can continue in single capture mode */
+			for (i = 0; i < HW_BUFFER_NUM; i++) {
+				if (vin->queue_buf[i]) {
+					list_add(to_buf_list(vin->queue_buf[i]),
+						 &vin->buf_list);
+					vin->queue_buf[i] = NULL;
+				}
+			}
+
+			if (!list_empty(&vin->buf_list))
+				rvin_capture_start(vin);
 		}
 	} else {
 		/*
@@ -1041,8 +1064,7 @@ static void rvin_buffer_queue(struct vb2_buffer *vb)
 	 * capturing if HW is ready to continue.
 	 */
 	if (vin->state == STALLED)
-		if (rvin_fill_hw(vin))
-			rvin_capture_on(vin);
+		rvin_capture_start(vin);
 
 	spin_unlock_irqrestore(&vin->qlock, flags);
 }
@@ -1059,25 +1081,9 @@ static int rvin_start_streaming(struct vb2_queue *vq, unsigned int count)
 
 	spin_lock_irqsave(&vin->qlock, flags);
 
-	vin->state = RUNNING;
 	vin->sequence = 0;
 
-	/* Continuous capture requires more buffers then there are HW slots */
-	vin->continuous = count > HW_BUFFER_NUM;
-
-	/*
-	 * This should never happen but if we don't have enough
-	 * buffers for HW bail out
-	 */
-	if (!rvin_fill_hw(vin)) {
-		vin_err(vin, "HW not ready to start, not enough buffers available\n");
-		ret = -EINVAL;
-		goto out;
-	}
-
 	ret = rvin_capture_start(vin);
-out:
-	/* Return all buffers if something went wrong */
 	if (ret) {
 		return_all_buffers(vin, VB2_BUF_STATE_QUEUED);
 		v4l2_subdev_call(sd, video, s_stream, 0);
@@ -1183,7 +1189,7 @@ int rvin_dma_probe(struct rvin_dev *vin, int irq)
 	q->ops = &rvin_qops;
 	q->mem_ops = &vb2_dma_contig_memops;
 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
-	q->min_buffers_needed = 2;
+	q->min_buffers_needed = 1;
 	q->dev = vin->dev;
 
 	ret = vb2_queue_init(q);