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media: coda: always hold back decoder jobs until we have enough bitstream payload

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The bitstream prefetch unit reads data in 256 byte blocks with some kind
of queueing. For the decoder to see data up to a desired position in the
next run, the bitstream has to be filled for 2 256 byte blocks past that
position aligned up to the next 256 byte boundary.
This should make sure we never run into a buffer underrun condition if
userspace does not supply new input buffers fast enough.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Philipp Zabel
2018-11-05 10:25:01 -05:00
committed by Mauro Carvalho Chehab
parent 6c0f5d236f
commit 51407c2da0
2 changed files with 20 additions and 5 deletions
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13
drivers/media/platform/coda/coda-common.c
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@@ -1273,6 +1273,7 @@ static int coda_job_ready(void *m2m_priv)
bool stream_end = ctx->bit_stream_param &
CODA_BIT_STREAM_END_FLAG;
int num_metas = ctx->num_metas;
struct coda_buffer_meta *meta;
unsigned int count;
count = hweight32(ctx->frm_dis_flg);
@@ -1293,16 +1294,18 @@ static int coda_job_ready(void *m2m_priv)
if (!stream_end && (num_metas + src_bufs) < 2) {
v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
"%d: not ready: need 2 buffers available (%d, %d)\n",
"%d: not ready: need 2 buffers available (queue:%d + bitstream:%d)\n",
ctx->idx, num_metas, src_bufs);
return 0;
}
if (!src_bufs && !stream_end &&
(coda_get_bitstream_payload(ctx) < 512)) {
meta = list_first_entry(&ctx->buffer_meta_list,
struct coda_buffer_meta, list);
if (!coda_bitstream_can_fetch_past(ctx, meta->end) &&
!stream_end) {
v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
"%d: not ready: not enough bitstream data (%d).\n",
ctx->idx, coda_get_bitstream_payload(ctx));
"not ready: not enough bitstream data to read past %u (%u)\n",
meta->end, ctx->bitstream_fifo.kfifo.in);
return 0;
}
}