[media] st-delta: debug: trace stream/frame information & summary

Adds some trace points showing input compressed stream or
output decoded frame information.
Adds an unconditional trace point when streaming starts showing
the compressed stream and the decoded frame information.
Adds an unconditional trace point at instance closure summarizing
into a single line the decoding process (stream information, decoded
and output frames number, potential errors observed).
Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/sti/delta/Makefile

 obj-$(CONFIG_VIDEO_STI_DELTA_DRIVER) := st-delta.o
-st-delta-y := delta-v4l2.o delta-mem.o delta-ipc.o
+st-delta-y := delta-v4l2.o delta-mem.o delta-ipc.o delta-debug.o
 
 # MJPEG support
 st-delta-$(CONFIG_VIDEO_STI_DELTA_MJPEG) += delta-mjpeg-hdr.o

drivers/media/platform/sti/delta/delta-debug.c

+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Authors: Hugues Fruchet <hugues.fruchet@st.com>
+ *          Fabrice Lecoultre <fabrice.lecoultre@st.com>
+ *          for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include "delta.h"
+#include "delta-debug.h"
+
+char *delta_streaminfo_str(struct delta_streaminfo *s, char *str,
+			   unsigned int len)
+{
+	if (!s)
+		return NULL;
+
+	snprintf(str, len,
+		 "%4.4s %dx%d %s %s dpb=%d %s %s %s%dx%d@(%d,%d) %s%d/%d",
+		 (char *)&s->streamformat, s->width, s->height,
+		 s->profile, s->level, s->dpb,
+		 (s->field == V4L2_FIELD_NONE) ? "progressive" : "interlaced",
+		 s->other,
+		 s->flags & DELTA_STREAMINFO_FLAG_CROP ? "crop=" : "",
+		 s->crop.width, s->crop.height,
+		 s->crop.left, s->crop.top,
+		 s->flags & DELTA_STREAMINFO_FLAG_PIXELASPECT ? "par=" : "",
+		 s->pixelaspect.numerator,
+		 s->pixelaspect.denominator);
+
+	return str;
+}
+
+char *delta_frameinfo_str(struct delta_frameinfo *f, char *str,
+			  unsigned int len)
+{
+	if (!f)
+		return NULL;
+
+	snprintf(str, len,
+		 "%4.4s %dx%d aligned %dx%d %s %s%dx%d@(%d,%d) %s%d/%d",
+		 (char *)&f->pixelformat, f->width, f->height,
+		 f->aligned_width, f->aligned_height,
+		 (f->field == V4L2_FIELD_NONE) ? "progressive" : "interlaced",
+		 f->flags & DELTA_STREAMINFO_FLAG_CROP ? "crop=" : "",
+		 f->crop.width, f->crop.height,
+		 f->crop.left, f->crop.top,
+		 f->flags & DELTA_STREAMINFO_FLAG_PIXELASPECT ? "par=" : "",
+		 f->pixelaspect.numerator,
+		 f->pixelaspect.denominator);
+
+	return str;
+}
+
+void delta_trace_summary(struct delta_ctx *ctx)
+{
+	struct delta_dev *delta = ctx->dev;
+	struct delta_streaminfo *s = &ctx->streaminfo;
+	unsigned char str[100] = "";
+
+	if (!(ctx->flags & DELTA_FLAG_STREAMINFO))
+		return;
+
+	dev_dbg(delta->dev, "%s %s, %d frames decoded, %d frames output, %d frames dropped, %d stream errors, %d decode errors",
+		ctx->name,
+		delta_streaminfo_str(s, str, sizeof(str)),
+		ctx->decoded_frames,
+		ctx->output_frames,
+		ctx->dropped_frames,
+		ctx->stream_errors,
+		ctx->decode_errors);
+}

drivers/media/platform/sti/delta/delta-debug.h

+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Authors: Hugues Fruchet <hugues.fruchet@st.com>
+ *          Fabrice Lecoultre <fabrice.lecoultre@st.com>
+ *          for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef DELTA_DEBUG_H
+#define DELTA_DEBUG_H
+
+char *delta_streaminfo_str(struct delta_streaminfo *s, char *str,
+			   unsigned int len);
+char *delta_frameinfo_str(struct delta_frameinfo *f, char *str,
+			  unsigned int len);
+void delta_trace_summary(struct delta_ctx *ctx);
+
+#endif /* DELTA_DEBUG_H */

drivers/media/platform/sti/delta/delta-v4l2.c

@@ -17,6 +17,7 @@
 #include <media/videobuf2-dma-contig.h>
 
 #include "delta.h"
+#include "delta-debug.h"
 #include "delta-ipc.h"
 
 #define DELTA_NAME	"st-delta"
@@ -443,11 +444,13 @@ static int delta_g_fmt_stream(struct file *file, void *fh,
 	struct delta_dev *delta = ctx->dev;
 	struct v4l2_pix_format *pix = &f->fmt.pix;
 	struct delta_streaminfo *streaminfo = &ctx->streaminfo;
+	unsigned char str[100] = "";
 
 	if (!(ctx->flags & DELTA_FLAG_STREAMINFO))
 		dev_dbg(delta->dev,
-			"%s V4L2 GET_FMT (OUTPUT): no stream information available, using default\n",
-			ctx->name);
+			"%s V4L2 GET_FMT (OUTPUT): no stream information available, default to %s\n",
+			ctx->name,
+			delta_streaminfo_str(streaminfo, str, sizeof(str)));
 
 	pix->pixelformat = streaminfo->streamformat;
 	pix->width = streaminfo->width;
@@ -470,11 +473,13 @@ static int delta_g_fmt_frame(struct file *file, void *fh, struct v4l2_format *f)
 	struct v4l2_pix_format *pix = &f->fmt.pix;
 	struct delta_frameinfo *frameinfo = &ctx->frameinfo;
 	struct delta_streaminfo *streaminfo = &ctx->streaminfo;
+	unsigned char str[100] = "";
 
 	if (!(ctx->flags & DELTA_FLAG_FRAMEINFO))
 		dev_dbg(delta->dev,
-			"%s V4L2 GET_FMT (CAPTURE): no frame information available, using default\n",
-			ctx->name);
+			"%s V4L2 GET_FMT (CAPTURE): no frame information available, default to %s\n",
+			ctx->name,
+			delta_frameinfo_str(frameinfo, str, sizeof(str)));
 
 	pix->pixelformat = frameinfo->pixelformat;
 	pix->width = frameinfo->aligned_width;
@@ -657,6 +662,7 @@ static int delta_s_fmt_frame(struct file *file, void *fh, struct v4l2_format *f)
 	const struct delta_dec *dec = ctx->dec;
 	struct v4l2_pix_format *pix = &f->fmt.pix;
 	struct delta_frameinfo frameinfo;
+	unsigned char str[100] = "";
 	struct vb2_queue *vq;
 	int ret;
 
@@ -709,6 +715,10 @@ static int delta_s_fmt_frame(struct file *file, void *fh, struct v4l2_format *f)
 
 	ctx->flags |= DELTA_FLAG_FRAMEINFO;
 	ctx->frameinfo = frameinfo;
+	dev_dbg(delta->dev,
+		"%s V4L2 SET_FMT (CAPTURE): frameinfo updated to %s\n",
+		ctx->name,
+		delta_frameinfo_str(&frameinfo, str, sizeof(str)));
 
 	pix->pixelformat = frameinfo.pixelformat;
 	pix->width = frameinfo.aligned_width;
@@ -1320,6 +1330,8 @@ static int delta_vb2_au_start_streaming(struct vb2_queue *q,
 	struct vb2_v4l2_buffer *vbuf = NULL;
 	struct delta_streaminfo *streaminfo = &ctx->streaminfo;
 	struct delta_frameinfo *frameinfo = &ctx->frameinfo;
+	unsigned char str1[100] = "";
+	unsigned char str2[100] = "";
 
 	if ((ctx->state != DELTA_STATE_WF_FORMAT) &&
 	    (ctx->state != DELTA_STATE_WF_STREAMINFO))
@@ -1381,6 +1393,10 @@ static int delta_vb2_au_start_streaming(struct vb2_queue *q,
 
 	ctx->state = DELTA_STATE_READY;
 
+	dev_dbg(delta->dev, "%s %s => %s\n", ctx->name,
+		delta_streaminfo_str(streaminfo, str1, sizeof(str1)),
+		delta_frameinfo_str(frameinfo, str2, sizeof(str2)));
+
 	delta_au_done(ctx, au, ret);
 	return 0;
 
@@ -1708,6 +1724,12 @@ static int delta_release(struct file *file)
 	/* close decoder */
 	call_dec_op(dec, close, ctx);
 
+	/*
+	 * trace a summary of instance
+	 * before closing (debug purpose)
+	 */
+	delta_trace_summary(ctx);
+
 	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
 
 	v4l2_fh_del(&ctx->fh);