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i.MX8QM: MIPI Raw formats not working correctly

Question asked by Florian K on Apr 16, 2020
Latest reply on Apr 17, 2020 by Bio_TICFSL



we are working on a custom camera driver for the Allied Vision Alvium MIPI CSI-2 camera on the Toradex Apalis iMX8QM.


RGB and YUV formats are working fine, however, we experience issues with raw formats such as RAW8.

It seems that the pixel data in the buffer is shifted by 2 bits, so effectively 2 bits are lost for every pixel. To avoid the loss of data, it is possible to configure the ISI to use 2 bytes per pixel, but the data will be shifted by 2 bits nonetheless.


The raw formats are necessary for streaming with Bayer formats and Mono formats such as V4L2_PIX_FMT_SBGGR8 or V4L2_PIX_FMT_GREY.


Is this a known problem and are there any solutions or workarounds available?


Thank you in advance!