linux-kernel - Re: [PATCH] mmc: dw_mmc: Reset DMA before enabling IDMAC

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Message-ID: <CAD=FV=W-GW0c8m_5Oaet=ZhJJwmk4RWJ7QurcySB7T8YvKr6Sg@mail.gmail.com>
Date:	Mon, 6 Oct 2014 11:11:05 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Sonny Rao <sonnyrao@...omium.org>
Cc:	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Eddie Cai <eddie.cai@...k-chips.com>,
	Addy Ke <addy.ke@...k-chips.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: dw_mmc: Reset DMA before enabling IDMAC

Sonny,

On Mon, Oct 6, 2014 at 10:53 AM, Sonny Rao <sonnyrao@...omium.org> wrote:
> We've already got a reset of DMA after it's done.  Add one before we
> start DMA too.  This fixes a data corruption on Rockchip SoCs which
> will get bad data when doing a DMA transfer after doing a PIO transfer.
>
> We tested this on an Exynos 5800 with HS200 and didn't notice any
> difference in sequential read throughput.
>
> Signed-off-by: Sonny Rao <sonnyrao@...omium.org>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> ---
>  drivers/mmc/host/dw_mmc.c | 4 ++++
>  1 file changed, 4 insertions(+)

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