media: imx-jpeg: Change the pattern size to 128x64

In order to decode a motion-jpeg bitstream, which doesn't provide a DHT,
the driver will first decode a pattern jpeg and use the DHT found in the
pattern to decode the first actual frame. This mode is called
"repeat-mode" and it utilizes linked descriptors.

The smallest supported resolution of 64x64 was used for that pattern to
not cause unneeded performance delay. This choice, however, can cause a
corrupted decoded picture of the first frame after the pattern, when the
resolution of that frame is larger than the pattern and is not aligned
to 64.

By altering the pattern size to 128x64, this corruption can be avoided.
That size has been confirmed to be safe by the hardware designers.
Additionally, a DMA buffer needs to be allocated to store the decoded
picture of the pattern image.

Signed-off-by: Ming Qian <ming.qian@oss.nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

1 files changed, 34 insertions, 8 deletions

diff --git a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
index 8a25ea8905ae..d72e15ee6d32 100644
--- a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
@@ -535,7 +535,18 @@ static const unsigned char jpeg_sos_maximal[] = {
 };
 
 static const unsigned char jpeg_image_red[] = {
-	0xFC, 0x5F, 0xA2, 0xBF, 0xCA, 0x73, 0xFE, 0xFE,
+	0xF9, 0xFE, 0x8A, 0xFC, 0x34, 0xFD, 0xC4, 0x28,
+	0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A,
+	0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0,
+	0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00,
+	0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02,
+	0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28,
+	0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A,
+	0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0,
+	0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00,
+	0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02,
+	0x8A, 0x00, 0x28, 0xA0, 0x0F, 0xFF, 0xD0, 0xF9,
+	0xFE, 0x8A, 0xFC, 0x34, 0xFD, 0xC4, 0x28, 0xA0,
 	0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00,
 	0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02,
 	0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28,
@@ -545,7 +556,7 @@ static const unsigned char jpeg_image_red[] = {
 	0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02,
 	0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28,
 	0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A,
-	0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00
+	0x00, 0x28, 0xA0, 0x0F
 };
 
 static const unsigned char jpeg_eoi[] = {
@@ -775,6 +786,13 @@ static void mxc_jpeg_free_slot_data(struct mxc_jpeg_dev *jpeg)
 	jpeg->slot_data.cfg_stream_vaddr = NULL;
 	jpeg->slot_data.cfg_stream_handle = 0;
 
+	dma_free_coherent(jpeg->dev, jpeg->slot_data.cfg_dec_size,
+			  jpeg->slot_data.cfg_dec_vaddr,
+			  jpeg->slot_data.cfg_dec_daddr);
+	jpeg->slot_data.cfg_dec_size = 0;
+	jpeg->slot_data.cfg_dec_vaddr = NULL;
+	jpeg->slot_data.cfg_dec_daddr = 0;
+
 	jpeg->slot_data.used = false;
 }
 
@@ -814,6 +832,14 @@ static bool mxc_jpeg_alloc_slot_data(struct mxc_jpeg_dev *jpeg)
 		goto err;
 	jpeg->slot_data.cfg_stream_vaddr = cfg_stm;
 
+	jpeg->slot_data.cfg_dec_size = MXC_JPEG_PATTERN_WIDTH * MXC_JPEG_PATTERN_HEIGHT * 2;
+	jpeg->slot_data.cfg_dec_vaddr = dma_alloc_coherent(jpeg->dev,
+							   jpeg->slot_data.cfg_dec_size,
+							   &jpeg->slot_data.cfg_dec_daddr,
+							   GFP_ATOMIC);
+	if (!jpeg->slot_data.cfg_dec_vaddr)
+		goto err;
+
 skip_alloc:
 	jpeg->slot_data.used = true;
 
@@ -1216,14 +1242,14 @@ static void mxc_jpeg_config_dec_desc(struct vb2_buffer *out_buf,
 	 */
 	*cfg_size = mxc_jpeg_setup_cfg_stream(cfg_stream_vaddr,
 					      V4L2_PIX_FMT_YUYV,
-					      MXC_JPEG_MIN_WIDTH,
-					      MXC_JPEG_MIN_HEIGHT);
+					      MXC_JPEG_PATTERN_WIDTH,
+					      MXC_JPEG_PATTERN_HEIGHT);
 	cfg_desc->next_descpt_ptr = desc_handle | MXC_NXT_DESCPT_EN;
-	cfg_desc->buf_base0 = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
+	cfg_desc->buf_base0 = jpeg->slot_data.cfg_dec_daddr;
 	cfg_desc->buf_base1 = 0;
-	cfg_desc->imgsize = MXC_JPEG_MIN_WIDTH << 16;
-	cfg_desc->imgsize |= MXC_JPEG_MIN_HEIGHT;
-	cfg_desc->line_pitch = MXC_JPEG_MIN_WIDTH * 2;
+	cfg_desc->imgsize = MXC_JPEG_PATTERN_WIDTH << 16;
+	cfg_desc->imgsize |= MXC_JPEG_PATTERN_HEIGHT;
+	cfg_desc->line_pitch = MXC_JPEG_PATTERN_WIDTH * 2;
 	cfg_desc->stm_ctrl = STM_CTRL_IMAGE_FORMAT(MXC_JPEG_YUV422);
 	cfg_desc->stm_ctrl |= STM_CTRL_BITBUF_PTR_CLR(1);
 	cfg_desc->stm_bufbase = cfg_stream_handle;