[media] add extra debug output, remove noisy warning

Add dev_dbg statements for easier future debugging; also change the warning
about packet ID mismatches to debug output to avoid flooding the logs. This
warning is only important in a very specific/rare use case when trying to
correlate input events with video data.

Signed-off-by: Martin Kaltenbrunner <modin@yuri.at>
Signed-off-by: Florian Echtler <floe@butterbrot.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
index d860d05..8add986 100644 (file)
--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -342,7 +342,7 @@ static void sur40_poll(struct input_polled_dev *polldev)
                 * instead of at the end.
                 */
                if (packet_id != header->packet_id)
-                       dev_warn(sur40->dev, "packet ID mismatch\n");
+                       dev_dbg(sur40->dev, "packet ID mismatch\n");
 
                packet_blobs = result / sizeof(struct sur40_blob);
                dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
@@ -389,6 +389,8 @@ static void sur40_process_video(struct sur40_state *sur40)
        list_del(&new_buf->list);
        spin_unlock(&sur40->qlock);
 
+       dev_dbg(sur40->dev, "buffer acquired\n");
+
        /* retrieve data via bulk read */
        result = usb_bulk_msg(sur40->usbdev,
                        usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
@@ -416,6 +418,8 @@ static void sur40_process_video(struct sur40_state *sur40)
                goto err_poll;
        }
 
+       dev_dbg(sur40->dev, "header acquired\n");
+
        sgt = vb2_dma_sg_plane_desc(&new_buf->vb, 0);
 
        result = usb_sg_init(&sgr, sur40->usbdev,
@@ -432,11 +436,14 @@ static void sur40_process_video(struct sur40_state *sur40)
                goto err_poll;
        }
 
+       dev_dbg(sur40->dev, "image acquired\n");
+
        /* mark as finished */
        v4l2_get_timestamp(&new_buf->vb.v4l2_buf.timestamp);
        new_buf->vb.v4l2_buf.sequence = sur40->sequence++;
        new_buf->vb.v4l2_buf.field = V4L2_FIELD_NONE;
        vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_DONE);
+       dev_dbg(sur40->dev, "buffer marked done\n");
        return;
 
 err_poll: