For this post, I will refer to Jetson-TX2-Series-Pinmux-Template_3.21.xlsm from the download center.
In this pinmux spreadsheet, we have
For DSI3_D1 lane, we can see that in the pinmux spreadsheet, pin E29 is negative and E30 is positive.
This contradicts the module datasheet:
taken from page 54 of Jetson_TX2_Series_Module_DataSheet_v1.6.pdf
It seems that the pinmux spreadsheet is incorrect. When the dtsi file is generated, the pinmux dtsi file does not contain an entry of dsi signals. Perhaps MIPI DSI is not part of the pinmux, so it does not matter. Or, TX2 MIPI DSI Phy supports polarity inversion, so this polarity swapping is resolved automatically.