media: vim2m: improve debug messages

1) Use two levels for debug:
	- level 1: setup stuff
	- level 2: add queue/dequeue messages

2) Better display the debug output, translating buffer
   type, fourcc and making some messages clearer.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/vim2m.c

@@ -39,7 +39,7 @@ MODULE_ALIAS("mem2mem_testdev");
 
 static unsigned debug;
 module_param(debug, uint, 0644);
-MODULE_PARM_DESC(debug, "activates debug info");
+MODULE_PARM_DESC(debug, "debug level");
 
 /* Default transaction time in msec */
 static unsigned int default_transtime = 40; /* Max 25 fps */
@@ -67,8 +67,8 @@ MODULE_PARM_DESC(default_transtime, "default transaction time in ms");
 #define MEM2MEM_HFLIP	(1 << 0)
 #define MEM2MEM_VFLIP	(1 << 1)
 
-#define dprintk(dev, fmt, arg...) \
-	v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
+#define dprintk(dev, lvl, fmt, arg...) \
+	v4l2_dbg(lvl, debug, &(dev)->v4l2_dev, "%s: " fmt, __func__, ## arg)
 
 
 static void vim2m_dev_release(struct device *dev)
@@ -227,6 +227,18 @@ static struct vim2m_q_data *get_q_data(struct vim2m_ctx *ctx,
 	return NULL;
 }
 
+static const char *type_name(enum v4l2_buf_type type)
+{
+	switch (type) {
+	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+		return "Output";
+	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+		return "Capture";
+	default:
+		return "Invalid";
+	}
+}
+
 #define CLIP(__color) \
 	(u8)(((__color) > 0xff) ? 0xff : (((__color) < 0) ? 0 : (__color)))
 
@@ -530,7 +542,7 @@ static int job_ready(void *priv)
 
 	if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen
 	    || v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen) {
-		dprintk(ctx->dev, "Not enough buffers available\n");
+		dprintk(ctx->dev, 1, "Not enough buffers available\n");
 		return 0;
 	}
 
@@ -601,7 +613,7 @@ static void device_work(struct work_struct *w)
 
 	if (curr_ctx->num_processed == curr_ctx->translen
 	    || curr_ctx->aborting) {
-		dprintk(curr_ctx->dev, "Finishing transaction\n");
+		dprintk(curr_ctx->dev, 2, "Finishing capture buffer fill\n");
 		curr_ctx->num_processed = 0;
 		v4l2_m2m_job_finish(vim2m_dev->m2m_dev, curr_ctx->fh.m2m_ctx);
 	} else {
@@ -796,9 +808,14 @@ static int vidioc_s_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f)
 	q_data->sizeimage	= q_data->width * q_data->height
 				* q_data->fmt->depth >> 3;
 
-	dprintk(ctx->dev,
-		"Setting format for type %d, wxh: %dx%d, fmt: %d\n",
-		f->type, q_data->width, q_data->height, q_data->fmt->fourcc);
+	dprintk(ctx->dev, 1,
+		"Format for type %s: %dx%d (%d bpp), fmt: %c%c%c%c\n",
+		type_name(f->type), q_data->width, q_data->height,
+		q_data->fmt->depth,
+		(q_data->fmt->fourcc & 0xff),
+		(q_data->fmt->fourcc >>  8) & 0xff,
+		(q_data->fmt->fourcc >> 16) & 0xff,
+		(q_data->fmt->fourcc >> 24) & 0xff);
 
 	return 0;
 }
@@ -933,7 +950,8 @@ static int vim2m_queue_setup(struct vb2_queue *vq,
 	*nplanes = 1;
 	sizes[0] = size;
 
-	dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);
+	dprintk(ctx->dev, 1, "%s: get %d buffer(s) of size %d each.\n",
+		type_name(vq->type), count, size);
 
 	return 0;
 }
@@ -946,7 +964,7 @@ static int vim2m_buf_out_validate(struct vb2_buffer *vb)
 	if (vbuf->field == V4L2_FIELD_ANY)
 		vbuf->field = V4L2_FIELD_NONE;
 	if (vbuf->field != V4L2_FIELD_NONE) {
-		dprintk(ctx->dev, "%s field isn't supported\n", __func__);
+		dprintk(ctx->dev, 1, "%s field isn't supported\n", __func__);
 		return -EINVAL;
 	}
 
@@ -958,12 +976,14 @@ static int vim2m_buf_prepare(struct vb2_buffer *vb)
 	struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 	struct vim2m_q_data *q_data;
 
-	dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);
+	dprintk(ctx->dev, 2, "type: %s\n", type_name(vb->vb2_queue->type));
 
 	q_data = get_q_data(ctx, vb->vb2_queue->type);
 	if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
-		dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n",
-				__func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage);
+		dprintk(ctx->dev, 1,
+			"%s data will not fit into plane (%lu < %lu)\n",
+			__func__, vb2_plane_size(vb, 0),
+			(long)q_data->sizeimage);
 		return -EINVAL;
 	}
 
@@ -1149,7 +1169,7 @@ static int vim2m_open(struct file *file)
 	v4l2_fh_add(&ctx->fh);
 	atomic_inc(&dev->num_inst);
 
-	dprintk(dev, "Created instance: %p, m2m_ctx: %p\n",
+	dprintk(dev, 1, "Created instance: %p, m2m_ctx: %p\n",
 		ctx, ctx->fh.m2m_ctx);
 
 open_unlock:
@@ -1162,7 +1182,7 @@ static int vim2m_release(struct file *file)
 	struct vim2m_dev *dev = video_drvdata(file);
 	struct vim2m_ctx *ctx = file2ctx(file);
 
-	dprintk(dev, "Releasing instance %p\n", ctx);
+	dprintk(dev, 1, "Releasing instance %p\n", ctx);
 
 	v4l2_fh_del(&ctx->fh);
 	v4l2_fh_exit(&ctx->fh);