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imx6 solo sd-card UHS-I question (linux 3.10.17)

Question asked by Philippe REY on Sep 6, 2016
Latest reply on Sep 7, 2016 by Philippe REY

Hello everyone,


We want to support UHS-I mode on our board for our sd-card (sd3 port of imx). Hardware wise, we kind of copied the sabre sd automative schematics,but we didn't wired the sd3 RST signal to a power regulator to switch off and on the sd-card power (that is, the power of the sd-card is always switched on).


In the imx6qdl-sabreauto.dtsi, at the usdhc3 declaration there is a paragraph stating that power off is needed for SD3.0 card re-enumeration in UHS mode.


Hence, my question is, is it absolutely mandatory to have a vmmc-regulator with power off / on declared on SD3_RST pin declared to support UHS mode at run time ? (not at boot).


Thank you guys,


ps : I'm using a 3.10.17 freescale linux kernel.