[media] coda: first step at error recovery

This implements a simple handler for the case where decode did not finish
sucessfully. This might be helpful during normal streaming, but for now it
only handles the case where the context would deadlock with userspace,
i.e. userspace issued DEC_CMD_STOP and waits for EOS, but after the failed
decode run we would hold the context and wait for userspace to queue more
buffers.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

3 files changed, 24 insertions, 0 deletions

diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c
index 325035b..25cbf9e 100644
--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -2198,12 +2198,32 @@ static void coda_finish_decode(struct coda_ctx *ctx)
 	ctx->display_idx = display_idx;
 }
 
+static void coda_error_decode(struct coda_ctx *ctx)
+{
+	struct vb2_v4l2_buffer *dst_buf;
+
+	/*
+	 * For now this only handles the case where we would deadlock with
+	 * userspace, i.e. userspace issued DEC_CMD_STOP and waits for EOS,
+	 * but after a failed decode run we would hold the context and wait for
+	 * userspace to queue more buffers.
+	 */
+	if (!(ctx->bit_stream_param & CODA_BIT_STREAM_END_FLAG))
+		return;
+
+	dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
+	dst_buf->sequence = ctx->qsequence - 1;
+
+	coda_m2m_buf_done(ctx, dst_buf, VB2_BUF_STATE_ERROR);
+}
+
 const struct coda_context_ops coda_bit_decode_ops = {
 	.queue_init = coda_decoder_queue_init,
 	.reqbufs = coda_decoder_reqbufs,
 	.start_streaming = coda_start_decoding,
 	.prepare_run = coda_prepare_decode,
 	.finish_run = coda_finish_decode,
+	.error_run = coda_error_decode,
 	.seq_end_work = coda_seq_end_work,
 	.release = coda_bit_release,
 };
diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index 78bd9a4..f92cc7d 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -1163,6 +1163,9 @@ static void coda_pic_run_work(struct work_struct *work)
 		ctx->hold = true;
 
 		coda_hw_reset(ctx);
+
+		if (ctx->ops->error_run)
+			ctx->ops->error_run(ctx);
 	} else if (!ctx->aborting) {
 		ctx->ops->finish_run(ctx);
 	}
diff --git a/drivers/media/platform/coda/coda.h b/drivers/media/platform/coda/coda.h
index 76d0594..40fe22f 100644
--- a/drivers/media/platform/coda/coda.h
+++ b/drivers/media/platform/coda/coda.h
@@ -183,6 +183,7 @@ struct coda_context_ops {
 	int (*start_streaming)(struct coda_ctx *ctx);
 	int (*prepare_run)(struct coda_ctx *ctx);
 	void (*finish_run)(struct coda_ctx *ctx);
+	void (*error_run)(struct coda_ctx *ctx);
 	void (*seq_end_work)(struct work_struct *work);
 	void (*release)(struct coda_ctx *ctx);
 };