From 56d159a4ec6d8da7313aac6fcbb95d8fffe689ba Mon Sep 17 00:00:00 2001
From: Philipp Zabel <p.zabel@pengutronix.de>
Date: Tue, 18 Jun 2019 12:45:10 -0400
Subject: [PATCH] media: coda: fix mpeg2 sequence number handling
Git-commit: 56d159a4ec6d8da7313aac6fcbb95d8fffe689ba
Patch-mainline: v5.3-rc1
References: bsc#1051510

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@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/media/platform/coda/coda-bit.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/media/platform/coda/coda-bit.c
+++ b/drivers/media/platform/coda/coda-bit.c
@@ -1667,6 +1667,7 @@ static int __coda_start_decoding(struct
 		coda_write(dev, 0, CODA_REG_BIT_BIT_STREAM_PARAM);
 		return -ETIMEDOUT;
 	}
+	ctx->sequence_offset = ~0U;
 	ctx->initialized = 1;
 
 	/* Update kfifo out pointer from coda bitstream read pointer */
@@ -2085,7 +2086,9 @@ static void coda_finish_decode(struct co
 		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_irqsave(&ctx->buffer_meta_lock, flags);
 		if (!list_empty(&ctx->buffer_meta_list)) {