[media] media i.MX27 camera: handle overflows properly

Signed-off-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/mx2_camera.c b/drivers/media/video/mx2_camera.c
index fc5ffe4..32a9d76 100644 (file)
--- a/drivers/media/video/mx2_camera.c
+++ b/drivers/media/video/mx2_camera.c
@@ -1198,7 +1198,7 @@ static struct soc_camera_host_ops mx2_soc_camera_host_ops = {
 };
 
 static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev,
-               int bufnum)
+               int bufnum, bool err)
 {
        struct mx2_fmt_cfg *prp = pcdev->emma_prp;
        struct mx2_buffer *buf;
@@ -1245,7 +1245,10 @@ static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev,
                list_del_init(&buf->queue);
                do_gettimeofday(&vb->v4l2_buf.timestamp);
                vb->v4l2_buf.sequence = pcdev->frame_count;
-               vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+               if (err)
+                       vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+               else
+                       vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
        }
 
        pcdev->frame_count++;
@@ -1296,21 +1299,18 @@ static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
        }
 
        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)) ||
+
+               buf = list_entry(pcdev->active_bufs.next,
+                       struct mx2_buffer, queue);
+               mx27_camera_frame_done_emma(pcdev,
+                                       buf->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
@@ -1318,13 +1318,13 @@ static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
                 */
                buf = list_entry(pcdev->active_bufs.next,
                        struct mx2_buffer, queue);
-               mx27_camera_frame_done_emma(pcdev, buf->bufnum);
+               mx27_camera_frame_done_emma(pcdev, buf->bufnum, false);
                status &= ~(1 << (6 - buf->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);
-       if ((status & (1 << 5)) || (status & (1 << 3)))
-               mx27_camera_frame_done_emma(pcdev, 1);
 
 irq_ok:
        spin_unlock_irqrestore(&pcdev->lock, flags);