linux-kernel - Re: [PATCH v2] mmc: dw_mmc: fix bug that cause mmc

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Message-ID: <CAD=FV=Vz6Rq9wFjvKAnzuKgXAqeVE2FafoOhtf3VaYO63bRUAA@mail.gmail.com>
Date:	Fri, 20 Feb 2015 13:43:16 -0800
From:	Doug Anderson <dianders@...gle.com>
To:	Addy Ke <addy.ke@...k-chips.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Olof Johansson <olof@...om.net>,
	Heiko Stübner <heiko@...ech.de>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Tao Huang <huangtao@...k-chips.com>,
	lintao <lintao@...k-chips.com>, Eddie Cai <cf@...k-chips.com>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] mmc: dw_mmc: fix bug that cause mmc_test failture

Addy,

On Thu, Feb 19, 2015 at 6:55 PM, Addy Ke <addy.ke@...k-chips.com> wrote:
> The STOP command can terminate a data transfer between a memory card and
> mmc controller.
>
> As show in Synopsys DesignWare Cores Mobile Stroage Host Databook:
> Data timeout and Data end-bit error will terminate further data transfer
> by mmc controller. So we should not send abort command to terminate a
> data transfer again if we got DRTO and EBE interrupt.
>
> After this patch, all mmc_test cases can pass on RK3288-Pink2 board.
>
> Signed-off-by: Addy Ke <addy.ke@...k-chips.com>
> ---
> Changes in v2:
> - DRTO and EBE are both set, should not send abort command too,
>   suggested by Doug Anderson.
>
>  drivers/mmc/host/dw_mmc.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)

I also suggested that you change the subject to "mmc: dw_mmc: fix
mmc_test by not sending abort for DRTO / EBE errors" which you didn't
do.  ...I guess that's not critical.  Perhaps Jaehoon (who is
collecting patches for Ulf now I think) can adjust the subject when he
applies.

In any case, v2 fixes my problems and seems OK to me.

Reviewed-by: Doug Anderson <dianders@...omium.org>

On rk3288 on a 3.14 kernel w/ lotsa backports:
Tested-by: Doug Anderson <dianders@...omium.org>
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