linux-kernel - Re: mmc: core: Fix access to HS400-ES devices

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Date:   Fri, 10 Mar 2017 09:46:08 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Anssi Hannula <anssi.hannula@...wise.fi>,
        Douglas Anderson <dianders@...omium.org>,
        Brian Norris <briannorris@...omium.org>
Subject: Re: mmc: core: Fix access to HS400-ES devices

Am Mittwoch, 1. März 2017, 14:11:47 CET schrieb Guenter Roeck:
> HS400-ES devices fail to initialize with the following error messages.
> 
> mmc1: power class selection to bus width 8 ddr 0 failed
> mmc1: error -110 whilst initialising MMC card
> 
> This was seen on Samsung Chromebook Plus. Code analysis points to
> commit 3d4ef329757c ("mmc: core: fix multi-bit bus width without
> high-speed mode"), which attempts to set the bus width for all but
> HS200 devices unconditionally. However, for HS400-ES, the bus width
> is already selected.
> 
> Cc: Anssi Hannula <anssi.hannula@...wise.fi>
> Cc: Douglas Anderson <dianders@...omium.org>
> Cc: Brian Norris <briannorris@...omium.org>
> Fixes: 3d4ef329757c ("mmc: core: fix multi-bit bus width ...")
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Reviewed-by: Shawn Lin <shawn.lin@...k-chip.com>

On a rk3399-kevin and the current mainline kernel from 20170309 it makes the 
issue go away and the emmc work again, so

Tested-by: Heiko Stuebner <heiko@...ech.de>