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DM355 lens shading correction

The DM355 CCDC has a lens shading correction module, but it is barely documented in spruf71a. There is some code in PSP_02_00_00_140 drivers/media/video/davinci/ccdc_dm355.c to set up the module, but not enough for me to work out how to use the feature.

Does anyone have some more information about how the lens shading correction feature works?