topic Re: iMX6DP/QP and eMMC HS200 mode in i.MX Processors

iMX6DP/QP and eMMC HS200 mode

JohnDoe1z — Mon, 09 Apr 2018 14:22:20 GMT

Hello,

the iMX6 DualPlus reference manual states that the uSDHC supports the MMC HS200 mode (section 68.1.2.1). However, the uSDHC driver coming with linux 4.9.11 does not advertise the HS200 mode for the DP/QP variants.

Is the HS200 mode supported by the iMX6 DP/QP and if so, why is the driver not reflecting that?

Re: iMX6DP/QP and eMMC HS200 mode

igorpadykov — Mon, 09 Apr 2018 22:59:06 GMT

Hi JohnDoe1z

it does not support HS200 mode and latest rev.1 Reference Manual (2017)

has not reference to HS200.

Best regards
igor
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Re: iMX6DP/QP and eMMC HS200 mode

JohnDoe1z — Tue, 10 Apr 2018 06:32:21 GMT

Thanks! I didn't notice that a new reference manual was released.

I modified the driver to use HS200 and from my first test it was working (SDx_CLK was according to HS200) and the transfer rate from the eMMC also increased by 60%. But it's probably just "luck" that it works...