From 5269aed0f82e703533b7831a49ab76b955b01b6b Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Thu, 2 Oct 2014 14:08:33 -0300 Subject: [PATCH] [media] coda: pad input stream for JPEG decoder Before starting a PIC_RUN, pad the bitstream with 0xff until 256 bytes past the next multiple of 256 bytes, if the buffer to be decoded is the last buffer in the bitstream. Signed-off-by: Philipp Zabel Signed-off-by: Kamil Debski Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/coda/coda-bit.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c index d1ecda54666e3..27e0764e3ac52 100644 --- a/drivers/media/platform/coda/coda-bit.c +++ b/drivers/media/platform/coda/coda-bit.c @@ -1625,6 +1625,26 @@ static int coda_prepare_decode(struct coda_ctx *ctx) coda_write(dev, ctx->iram_info.axi_sram_use, CODA7_REG_BIT_AXI_SRAM_USE); + if (ctx->codec->src_fourcc == V4L2_PIX_FMT_JPEG) { + struct coda_buffer_meta *meta; + + /* If this is the last buffer in the bitstream, add padding */ + meta = list_first_entry(&ctx->buffer_meta_list, + struct coda_buffer_meta, list); + if (meta->end == (ctx->bitstream_fifo.kfifo.in & + ctx->bitstream_fifo.kfifo.mask)) { + static unsigned char buf[512]; + unsigned int pad; + + /* Pad to multiple of 256 and then add 256 more */ + pad = ((0 - meta->end) & 0xff) + 256; + + memset(buf, 0xff, sizeof(buf)); + + kfifo_in(&ctx->bitstream_fifo, buf, pad); + } + } + coda_kfifo_sync_to_device_full(ctx); coda_command_async(ctx, CODA_COMMAND_PIC_RUN); -- 2.30.2