Re: [PATCH] mmc: core: Fix access to HS400-ES devices

[Doug Anderson]

Hi,

On Tue, Mar 14, 2017 at 9:22 AM, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> On 1 March 2017 at 23:11, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
>> 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@xxxxxxxxxx>
>> Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
>> Cc: Brian Norris <briannorris@xxxxxxxxxxxx>
>> Fixes: 3d4ef329757c ("mmc: core: fix multi-bit bus width ...")
>> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
>
> Sorry for the delay. Been traveling.
>
> Applied for fixes, thanks!

+stable

The commit 3d4ef329757c ("mmc: core: fix multi-bit bus width without
high-speed mode") got backported to many stable branches, so probably
this commit 773dc118756b ("mmc: core: Fix access to HS400-ES devices")
also needs to get picked to the same stable branches.

In the very least v4.9 and v4.4 stable includes the broken patch but
not this fix.

-Doug