linux-kernel - [PATCH AUTOSEL 5.2 151/249] media: coda: fix mpeg2 sequence number handling

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Message-Id: <20190715134655.4076-151-sashal@kernel.org>
Date:   Mon, 15 Jul 2019 09:45:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 5.2 151/249] media: coda: fix mpeg2 sequence number handling

From: Philipp Zabel <p.zabel@...gutronix.de>

[ Upstream commit 56d159a4ec6d8da7313aac6fcbb95d8fffe689ba ]

Sequence number handling assumed that the BIT processor frame number
starts counting at 1, but this is not true for the MPEG-2 decoder,
which starts at 0. Fix the sequence counter offset detection to handle
this.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/coda/coda-bit.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c
index 976f6aa69f41..1eeed34f300d 100644
--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -1739,6 +1739,7 @@ static int __coda_start_decoding(struct coda_ctx *ctx)
 		v4l2_err(&dev->v4l2_dev, "CODA_COMMAND_SEQ_INIT timeout\n");
 		return ret;
 	}
+	ctx->sequence_offset = ~0U;
 	ctx->initialized = 1;
 
 	/* Update kfifo out pointer from coda bitstream read pointer */
@@ -2151,7 +2152,9 @@ static void coda_finish_decode(struct coda_ctx *ctx)
 		v4l2_err(&dev->v4l2_dev,
 			 "decoded frame index out of range: %d\n", decoded_idx);
 	} else {
-		val = coda_read(dev, CODA_RET_DEC_PIC_FRAME_NUM) - 1;
+		val = coda_read(dev, CODA_RET_DEC_PIC_FRAME_NUM);
+		if (ctx->sequence_offset == -1)
+			ctx->sequence_offset = val;
 		val -= ctx->sequence_offset;
 		spin_lock(&ctx->buffer_meta_lock);
 		if (!list_empty(&ctx->buffer_meta_list)) {
-- 
2.20.1