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Date: Mon, 7 Aug 2017 13:58:11 -0700
From: Greg KH <gregkh@linuxfoundation.org>
To: linux@roeck-us.net, anssi.hannula@bitwise.fi,
        briannorris@chromium.org, dianders@chromium.org, heiko@sntech.de,
        shawn.lin@rock-chip.com, ulf.hansson@linaro.org
Cc: stable@vger.kernel.org, stable-commits@vger.kernel.org
Subject: Re: Patch "mmc: core: Fix access to HS400-ES devices" has been added
 to the 4.4-stable tree
Message-ID: <20170807205811.GA23372@kroah.com>
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On Mon, Aug 07, 2017 at 01:38:43PM -0700, gregkh@linuxfoundation.org wrote:
> 
> This is a note to let you know that I've just added the patch titled
> 
>     mmc: core: Fix access to HS400-ES devices
> 
> to the 4.4-stable tree which can be found at:
>     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> 
> The filename of the patch is:
>      mmc-core-fix-access-to-hs400-es-devices.patch
> and it can be found in the queue-4.4 subdirectory.
> 
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
> 
> 
> >From 773dc118756b1f38766063e90e582016be868f09 Mon Sep 17 00:00:00 2001
> From: Guenter Roeck <linux@roeck-us.net>
> Date: Wed, 1 Mar 2017 14:11:47 -0800
> Subject: mmc: core: Fix access to HS400-ES devices
> 
> From: Guenter Roeck <linux@roeck-us.net>
> 
> commit 773dc118756b1f38766063e90e582016be868f09 upstream.
> 
> 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@bitwise.fi>
> Cc: Douglas Anderson <dianders@chromium.org>
> Cc: Brian Norris <briannorris@chromium.org>
> Fixes: 3d4ef329757c ("mmc: core: fix multi-bit bus width ...")
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
> Reviewed-by: Shawn Lin <shawn.lin@rock-chip.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> ---
>  drivers/mmc/core/mmc.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1581,7 +1581,7 @@ static int mmc_init_card(struct mmc_host
>  		err = mmc_select_hs400(card);
>  		if (err)
>  			goto free_card;
> -	} else {
> +	} else if (!mmc_card_hs400es(card)) {

Nope, this breaks the build on 4.4.  Anyone want to provide a working
backport?

thanks,

greg k-h