[media] coda: store bitstream buffer position with buffer metadata

Storing the buffer position in the bitstream with the buffer metadata
allows to later use that information to drop metadata for skipped buffers
and to determine whether bitstream padding has to be applied.

This patch also renames struct coda_timestamp to struct coda_buffer_meta
to make clear that it contains more than only the buffer timestamp.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

3 files changed, 43 insertions, 32 deletions

diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c
index 931248dc60f9..d1ecda54666e 100644
--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -217,11 +217,16 @@ static bool coda_bitstream_try_queue(struct coda_ctx *ctx,
 void coda_fill_bitstream(struct coda_ctx *ctx)
 {
         struct vb2_buffer *src_buf;
-        struct coda_timestamp *ts;
+        struct coda_buffer_meta *meta;
+        u32 start;
 
         while (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) > 0) {
                 src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
 
+                /* Buffer start position */
+                start = ctx->bitstream_fifo.kfifo.in &
+                        ctx->bitstream_fifo.kfifo.mask;
+
                 if (coda_bitstream_try_queue(ctx, src_buf)) {
                         /*
                          * Source buffer is queued in the bitstream ringbuffer;
@@ -229,12 +234,16 @@ void coda_fill_bitstream(struct coda_ctx *ctx)
                          */
                         src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
 
-                        ts = kmalloc(sizeof(*ts), GFP_KERNEL);
-                        if (ts) {
-                                ts->sequence = src_buf->v4l2_buf.sequence;
-                                ts->timecode = src_buf->v4l2_buf.timecode;
-                                ts->timestamp = src_buf->v4l2_buf.timestamp;
-                                list_add_tail(&ts->list, &ctx->timestamp_list);
+                        meta = kmalloc(sizeof(*meta), GFP_KERNEL);
+                        if (meta) {
+                                meta->sequence = src_buf->v4l2_buf.sequence;
+                                meta->timecode = src_buf->v4l2_buf.timecode;
+                                meta->timestamp = src_buf->v4l2_buf.timestamp;
+                                meta->start = start;
+                                meta->end = ctx->bitstream_fifo.kfifo.in &
+                                            ctx->bitstream_fifo.kfifo.mask;
+                                list_add_tail(&meta->list,
+                                              &ctx->buffer_meta_list);
                         }
 
                         v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
@@ -1629,7 +1638,7 @@ static void coda_finish_decode(struct coda_ctx *ctx)
         struct coda_q_data *q_data_src;
         struct coda_q_data *q_data_dst;
         struct vb2_buffer *dst_buf;
-        struct coda_timestamp *ts;
+        struct coda_buffer_meta *meta;
         unsigned long payload;
         int width, height;
         int decoded_idx;
@@ -1757,23 +1766,23 @@ static void coda_finish_decode(struct coda_ctx *ctx)
                 val = coda_read(dev, CODA_RET_DEC_PIC_FRAME_NUM) - 1;
                 val -= ctx->sequence_offset;
                 mutex_lock(&ctx->bitstream_mutex);
-                if (!list_empty(&ctx->timestamp_list)) {
-                        ts = list_first_entry(&ctx->timestamp_list,
-                                              struct coda_timestamp, list);
-                        list_del(&ts->list);
-                        if (val != (ts->sequence & 0xffff)) {
+                if (!list_empty(&ctx->buffer_meta_list)) {
+                        meta = list_first_entry(&ctx->buffer_meta_list,
+                                              struct coda_buffer_meta, list);
+                        list_del(&meta->list);
+                        if (val != (meta->sequence & 0xffff)) {
                                 v4l2_err(&dev->v4l2_dev,
                                          "sequence number mismatch (%d(%d) != %d)\n",
                                          val, ctx->sequence_offset,
-                                         ts->sequence);
+                                         meta->sequence);
                         }
-                        ctx->frame_timestamps[decoded_idx] = *ts;
-                        kfree(ts);
+                        ctx->frame_metas[decoded_idx] = *meta;
+                        kfree(meta);
                 } else {
                         v4l2_err(&dev->v4l2_dev, "empty timestamp list!\n");
-                        memset(&ctx->frame_timestamps[decoded_idx], 0,
-                               sizeof(struct coda_timestamp));
-                        ctx->frame_timestamps[decoded_idx].sequence = val;
+                        memset(&ctx->frame_metas[decoded_idx], 0,
+                               sizeof(struct coda_buffer_meta));
+                        ctx->frame_metas[decoded_idx].sequence = val;
                 }
                 mutex_unlock(&ctx->bitstream_mutex);
 
@@ -1812,9 +1821,9 @@ static void coda_finish_decode(struct coda_ctx *ctx)
                                              V4L2_BUF_FLAG_PFRAME |
                                              V4L2_BUF_FLAG_BFRAME);
                 dst_buf->v4l2_buf.flags |= ctx->frame_types[ctx->display_idx];
-                ts = &ctx->frame_timestamps[ctx->display_idx];
-                dst_buf->v4l2_buf.timecode = ts->timecode;
-                dst_buf->v4l2_buf.timestamp = ts->timestamp;
+                meta = &ctx->frame_metas[ctx->display_idx];
+                dst_buf->v4l2_buf.timecode = meta->timecode;
+                dst_buf->v4l2_buf.timestamp = meta->timestamp;
 
                 switch (q_data_dst->fourcc) {
                 case V4L2_PIX_FMT_YUV420:
diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index 76b80d27a135..6eaf88e88862 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -1279,14 +1279,14 @@ static void coda_stop_streaming(struct vb2_queue *q)
         }
 
         if (!ctx->streamon_out && !ctx->streamon_cap) {
-                struct coda_timestamp *ts;
+                struct coda_buffer_meta *meta;
 
                 mutex_lock(&ctx->bitstream_mutex);
-                while (!list_empty(&ctx->timestamp_list)) {
-                        ts = list_first_entry(&ctx->timestamp_list,
-                                              struct coda_timestamp, list);
-                        list_del(&ts->list);
-                        kfree(ts);
+                while (!list_empty(&ctx->buffer_meta_list)) {
+                        meta = list_first_entry(&ctx->buffer_meta_list,
+                                                struct coda_buffer_meta, list);
+                        list_del(&meta->list);
+                        kfree(meta);
                 }
                 mutex_unlock(&ctx->bitstream_mutex);
                 kfifo_init(&ctx->bitstream_fifo,
@@ -1642,7 +1642,7 @@ static int coda_open(struct file *file)
                 ctx->bitstream.vaddr, ctx->bitstream.size);
         mutex_init(&ctx->bitstream_mutex);
         mutex_init(&ctx->buffer_mutex);
-        INIT_LIST_HEAD(&ctx->timestamp_list);
+        INIT_LIST_HEAD(&ctx->buffer_meta_list);
 
         coda_lock(ctx);
         list_add(&ctx->list, &dev->instances);
diff --git a/drivers/media/platform/coda/coda.h b/drivers/media/platform/coda/coda.h
index c14dee82891f..8dd81a75c2fb 100644
--- a/drivers/media/platform/coda/coda.h
+++ b/drivers/media/platform/coda/coda.h
@@ -130,11 +130,13 @@ struct coda_params {
         u32                     slice_max_mb;
 };
 
-struct coda_timestamp {
+struct coda_buffer_meta {
         struct list_head        list;
         u32                     sequence;
         struct v4l2_timecode    timecode;
         struct timeval          timestamp;
+        u32                     start;
+        u32                     end;
 };
 
 /* Per-queue, driver-specific private data */
@@ -220,9 +222,9 @@ struct coda_ctx {
         struct coda_aux_buf             slicebuf;
         struct coda_aux_buf             internal_frames[CODA_MAX_FRAMEBUFFERS];
         u32                             frame_types[CODA_MAX_FRAMEBUFFERS];
-        struct coda_timestamp           frame_timestamps[CODA_MAX_FRAMEBUFFERS];
+        struct coda_buffer_meta         frame_metas[CODA_MAX_FRAMEBUFFERS];
         u32                             frame_errors[CODA_MAX_FRAMEBUFFERS];
-        struct list_head                timestamp_list;
+        struct list_head                buffer_meta_list;
         struct coda_aux_buf             workbuf;
         int                             num_internal_frames;
         int                             idx;