Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Alif Semiconductor/AE302F40C1537LE_CM55_HP_View/DSI/DSI_PHY_ULPS_CTRL#0x0
PHY ULPS Control Register
ULPS mode Request on clock lane.
ULPS mode Exit on clock lane.
ULPS mode Request on all active data lanes.
ULPS mode Exit on all active data lanes.
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https://github.com/cmsis-svd/cmsis-svd-data