imx8qm mipi csi raw12 Data Storage Problem

[zoro_li]

Now I can get the RAW12 data on IMX8QM。

Use this way : sensor -> mipi csi (raw12) -> isi (raw16) -> user

But I found that data seems to have problems.

For example, Sensor raw data is 0x1234, but I get 0x3412，higher and low bytes have an interchange。

How can I modify to solve this problem?

[joanxie]

for imx8qm ISI, you need to shift,

• RAW10 {valid_data, 4’b0} . After right shift 4 bits, you will get the correct image.
• RAW12 {valid_data, 2'b0} . After right shift 2 bits, you will get the correct image.

[zoro_li]

hi  joanxie:

      Thanks for your replay.

      Now my way is to swap high and low bytes and then right shift 2 bits to get correct image.

      I don't know why I need to exchange high and low bytes of data here.

      I feel that there are some problems here.

[chendd14]

hi zoro_li,

I swaped the high and low bytes, and right shifted 2 bits, then I applied debayering with OpenCV cvtColor(..., ..., cv::COLOR_BayerBG2BGR). After that, I got a gray image., not a colorful one.

Would you please help me find out the problem?

Sensor: IMX577

[joanxie]

you need to set 16bits as format, then shift two bits to get correct data, ISI doesn't have exchange issue, you need check your source code

[zoro_li]

hi:

   My input and output configuration is as follows, is there any problem?

output:

       {
+               .name           = "SBGGR12",
+               .fourcc         = V4L2_PIX_FMT_SBGGR12,
+               .depth          = { 16 },
+               .color          = MXC_ISI_OUT_FMT_RAW16,
+               .memplanes      = 1,
+               .colplanes      = 1,
+               .mbus_code      = MEDIA_BUS_FMT_SBGGR12_1X12,
        }

input:

{
+ .name = "SBGGR12",
+ .fourcc = V4L2_PIX_FMT_SBGGR12,
+ .depth = { 16 },
+ .memplanes = 1,
+ .colplanes = 1,
}

[joanxie]

which file did you set this? is it the ISI file?

[zoro_li]

drivers/staging/media/imx/imx8-isi-cap.c