AnsweredAssumed Answered

Enabling UHSI on USDHC4

Question asked by John Tobias on Aug 2, 2013
Latest reply on Sep 5, 2013 by Sonu Goyal



I have a wifi module (Marvel 8797 - SDIO 3.0) that is connected to USDHC4.

My pinmux settings for my port as follow: (LVE is enabled).


CLK   0x4170b9

CMD   0x4170b9

DAT0  0x4170b9

DAT1  0x4170b9

DAT2  0x4170b9

DAT3  0x4170b9


My wifi module works on 1-bit mode but not on 4-bit mode. That is because the SDIO 3.0 require an UHSI (it require 1.8v signaling) enabled and by default, the kernel seems not configured for the said mode.

I would like to know what are the missing keys in order to enable it correctly?.