MIPI CSI2 RAW10 which V4L2 pixel format?

[joachimjaehn]

I have a gray scale Image Sensor with SubLVDS. I use e Lattis FPGA to convert the SubLVDS to MIPI CSI2. The MIPI signal is connected to an imx6. I configure the sensor to 10Bit and the FPGA to RAW10. Now i write a V4L2 modul.

I configure the MIPI with "mipi_csi2_set_datatype(mipi_csi2_info,MIPI_DT_RAW10);" to RAW10. 

In Userspace i need image Data with 10 bit gray scale saved in 16bit Array.

there is a chapter "40.5.15 RAW10 Data Reception" in IMX6DQRM.pdf

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf

"The RAW10 data format the byte to 32-bit memory word mapping follows the generic
CSI-2 rule."

Which Pixelformat i need for "sensor_data.pix.pixelformat" to get correct data from MIPI CSI2?

how i can convert the image data? 

[joachimjaehn]

Hi Igor,

i fond this Pixelformats in videodev2.h:

/* 10bit raw bayer packed, 5 bytes for every 4 pixels */
#define V4L2_PIX_FMT_SBGGR10P v4l2_fourcc('p', 'B', 'A', 'A')
#define V4L2_PIX_FMT_SGBRG10P v4l2_fourcc('p', 'G', 'A', 'A')
#define V4L2_PIX_FMT_SGRBG10P v4l2_fourcc('p', 'g', 'A', 'A')
#define V4L2_PIX_FMT_SRGGB10P v4l2_fourcc('p', 'R', 'A', 'A')

and the bit order at this Link 

V4L2_PIX_FMT_SRGGB10P ('pRAA'), V4L2_PIX_FMT_SGRBG10P ('pgAA'), V4L2_PIX_FMT_SGBRG10P ('pGAA'), V4L2... 

this is the right bit order. now i have a problem. There is no implementations of 10bit raw bayer packed in my kernel files. 

mxc_v4l2_capture.c

/*!
* Indicates whether the palette is supported.
*
* @param palette V4L2_PIX_FMT_RGB565, V4L2_PIX_FMT_BGR24 or V4L2_PIX_FMT_BGR32
*
* @return 0 if failed
*/
static inline int valid_mode(u32 palette)
{
return (
(palette == V4L2_PIX_FMT_RGB565) ||
(palette == V4L2_PIX_FMT_BGR24) ||
(palette == V4L2_PIX_FMT_RGB24) ||
(palette == V4L2_PIX_FMT_BGR32) ||
(palette == V4L2_PIX_FMT_RGB32) ||
(palette == V4L2_PIX_FMT_YUV422P) ||
(palette == V4L2_PIX_FMT_UYVY) ||
(palette == V4L2_PIX_FMT_YUYV) ||
(palette == V4L2_PIX_FMT_YUV420) ||
(palette == V4L2_PIX_FMT_YVU420) ||
(palette == V4L2_PIX_FMT_NV12)) ||
(palette == V4L2_PIX_FMT_GREY) || /* Enabling the 8-bit greyscale pixelformat*/
(palette == V4L2_PIX_FMT_Y10); /* Enabling the 10-bit greyscale pixelformat*/
}

[igorpadykov]

Hi joachim

IPU can receive bayer format from CSI port as generic data, but
IPU don't make Bayer conversion and IPU (IC, DP, DC and etc) doesn't
recognize bayer as a valid image format.
You will need to use some graphics library/API like gstreamer, ffmpeg and
others to make this conversion using the CPU. Please also check
https://community.nxp.com/thread/357122

Best regards
igor
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