Re: [PATCH v2] mmc: dw_mmc: add quirk for broken data transfer over scheme

From: Doug Anderson <dianders@chromium.org>
To: addy ke <addy.ke@rock-chips.com>
Cc: "Rob Herring" <robh+dt@kernel.org>,
	"Pawel Moll" <pawel.moll@arm.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
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	"Randy Dunlap" <rdunlap@infradead.org>,
	"Seungwon Jeon" <tgih.jun@samsung.com>,
	"Jaehoon Chung" <jh80.chung@samsung.com>,
	"Chris Ball" <chris@printf.net>,
	"Ulf Hansson" <ulf.hansson@linaro.org>,
	"Dinh Nguyen" <dinguyen@altera.com>,
	"Heiko Stübner" <heiko@sntech.de>,
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	"Sonny Rao" <sonnyrao@chromium.org>,
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	<linux-arm-kernel@lists.infradead.org>,
	"open list:ARM/Rockchip SoC..."
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	姚智情 <yzq@rock-chips.com>, "han jiang" <hj@rock-chips.com>,
	"Kever Yang" <kever.yang@rock-chips.com>,
	zhangqing <zhangqing@rock-chips.com>,
	"Lin Huang" <hl@rock-chips.com>
Subject: Re: [PATCH v2] mmc: dw_mmc: add quirk for broken data transfer over scheme
Date: Tue, 2 Dec 2014 09:47:18 -0800	[thread overview]
Message-ID: <CAD=FV=V3BF8qv17n4_T5Lys1BnKsqE9NqOTB-6OwX0VOviWRrw@mail.gmail.com> (raw)
In-Reply-To: <547D6F36.50103@rock-chips.com>

Addy,

On Mon, Dec 1, 2014 at 11:50 PM, addy ke <addy.ke@rock-chips.com> wrote:
> We don't know why we have this problem,
> but this problem is really exist, and we need patch to fix this problem now.
> I will post a follow up change when we find the root cause.

To me that seems reasonable.  Certainly I would prefer to have this
patch while waiting for the root cause, but it's up to Ulf.

> And there is a little probability of this problem on RK SoC, such as RK3188, RK3066,
> when worse card inserted in.
> Maybe the other SoCs have the similar problem.
>
> So I will add this quirk in rockchip code(dw_mmc-rockchip.c) as follows:
> static int dw_mci_rockchip_parse_dt(struct dw_mci *host)
> {
>         host->quirk |= DW_MCI_QUIRK_BROKEN_DTO;
>
>         return 0;
> }
>
> ......
>         .parse_dt = dw_mci_rockchip_parse_dt,
> ......
>
> is right?

When you added "sdio_id0" you got feedback that you should use
dw_mci_rockchip_init().  Why not do the same thing here?