linux-kernel - Re: [PATCH] ARM64: dts: meson: disable sd-uhs modes on the libretech-cc

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Date:   Fri, 27 Apr 2018 12:15:39 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Carlo Caione <carlo@...one.org>, devicetree@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM64: dts: meson: disable sd-uhs modes on the libretech-cc

Jerome Brunet <jbrunet@...libre.com> writes:

> There is a problem with the sd-uhs mode when doing a soft reboot.
> Switching back from 1.8v to 3.3v messes with the card, which no longer
> respond (timeout errors). According to the specification, we should
> perform a card reset (power cycling the card) but this is something we
> cannot control on this design.
>
> Then the only solution to restore the communication with the card is an
> "unplug-plug" which is not acceptable
>
> Until we find a solution, if any, disable the sd-uhs modes on this design.
> For the people using uhs at the moment, there will a performance drop as
> a result.
>
> Fixes: 3cde63ebc85c ("ARM64: dts: meson-gxl: libretech-cc: enable high speed modes")
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>

Applied to v4.17/fixes, and adding a Cc to stable.

Thanks,

Kevin