From 06480fcbcbf5a838bfce524c9ea5e80200ba7445 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Tue, 18 Jun 2019 12:45:10 -0400 Subject: [PATCH] media: coda: fix mpeg2 sequence number handling [ 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 Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- 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 717ee9a..1b8024f 100644 --- a/drivers/media/platform/coda/coda-bit.c +++ b/drivers/media/platform/coda/coda-bit.c @@ -1581,6 +1581,7 @@ static int __coda_start_decoding(struct coda_ctx *ctx) 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 */ @@ -1971,7 +1972,9 @@ 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_irqsave(&ctx->buffer_meta_lock, flags); if (!list_empty(&ctx->buffer_meta_list)) { -- 2.7.4