media: Revert "media: cedrus: Allow using the current dst buffer as reference"

This reverts commit cf20ae15.

The vb2_find_timestamp helper was modified to allow finding buffers
regardless of their current state in the queue. This means that we
no longer have to take particular care of references to the current
capture buffer.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/sunxi/cedrus/cedrus_dec.c

@@ -22,19 +22,6 @@
 #include "cedrus_dec.h"
 #include "cedrus_hw.h"
 
-int cedrus_reference_index_find(struct vb2_queue *queue,
-				struct vb2_buffer *vb2_buf, u64 timestamp)
-{
-	/*
-	 * Allow using the current capture buffer as reference, which can occur
-	 * for field-coded pictures.
-	 */
-	if (vb2_buf->timestamp == timestamp)
-		return vb2_buf->index;
-	else
-		return vb2_find_timestamp(queue, timestamp, 0);
-}
-
 void cedrus_device_run(void *priv)
 {
 	struct cedrus_ctx *ctx = priv;

drivers/staging/media/sunxi/cedrus/cedrus_dec.h

@@ -16,8 +16,6 @@
 #ifndef _CEDRUS_DEC_H_
 #define _CEDRUS_DEC_H_
 
-int cedrus_reference_index_find(struct vb2_queue *queue,
-				struct vb2_buffer *vb2_buf, u64 timestamp);
 void cedrus_device_run(void *priv);
 
 #endif

drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c

@@ -10,7 +10,6 @@
 #include <media/videobuf2-dma-contig.h>
 
 #include "cedrus.h"
-#include "cedrus_dec.h"
 #include "cedrus_hw.h"
 #include "cedrus_regs.h"
 
@@ -160,8 +159,8 @@ static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 	cedrus_write(dev, VE_DEC_MPEG_PICBOUNDSIZE, reg);
 
 	/* Forward and backward prediction reference buffers. */
-	forward_idx = cedrus_reference_index_find(cap_q, &run->dst->vb2_buf,
-						  slice_params->forward_ref_ts);
+	forward_idx = vb2_find_timestamp(cap_q,
+					 slice_params->forward_ref_ts, 0);
 
 	fwd_luma_addr = cedrus_dst_buf_addr(ctx, forward_idx, 0);
 	fwd_chroma_addr = cedrus_dst_buf_addr(ctx, forward_idx, 1);
@@ -169,9 +168,8 @@ static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 	cedrus_write(dev, VE_DEC_MPEG_FWD_REF_LUMA_ADDR, fwd_luma_addr);
 	cedrus_write(dev, VE_DEC_MPEG_FWD_REF_CHROMA_ADDR, fwd_chroma_addr);
 
-	backward_idx = cedrus_reference_index_find(cap_q, &run->dst->vb2_buf,
-						   slice_params->backward_ref_ts);
-
+	backward_idx = vb2_find_timestamp(cap_q,
+					  slice_params->backward_ref_ts, 0);
 	bwd_luma_addr = cedrus_dst_buf_addr(ctx, backward_idx, 0);
 	bwd_chroma_addr = cedrus_dst_buf_addr(ctx, backward_idx, 1);