linux-kernel - Re: [PATCH v4 4/4] mmc: dw_mmc: Set timeout to max upon resume

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Date:	Wed, 07 Aug 2013 00:02:53 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Chris Ball <cjb@...top.org>, Olof Johansson <olof@...om.net>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	James Hogan <james.hogan@...tec.com>,
	Grant Grundler <grundler@...omium.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/4] mmc: dw_mmc: Set timeout to max upon resume

On Tuesday 06 of August 2013 14:37:51 Doug Anderson wrote:
> The TMOUT register is initted to 0xffffffff at probe time but isn't
> initted after suspend/resume.  Add an init of this value.
> 
> No problems were observed without this (it will also get initted in
> __dw_mci_start_request if there is data to send), but it makes the
> register dump before and after suspend clean.
> 
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Acked-by: Seungwon Jeon <tgih.jun@...sung.com>
> ---
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
> 
>  drivers/mmc/host/dw_mmc.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 0fa3135..1abcb36 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -2505,6 +2505,9 @@ int dw_mci_resume(struct dw_mci *host)
>  	/* Restore the old value at FIFOTH register */
>  	mci_writel(host, FIFOTH, host->fifoth_val);
> 
> +	/* Put in max timeout */
> +	mci_writel(host, TMOUT, 0xFFFFFFFF);
> +
>  	mci_writel(host, RINTSTS, 0xFFFFFFFF);
>  	mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER 
|
>  		   SDMMC_INT_TXDR | SDMMC_INT_RXDR |

Not sure if we really care about register dumps, but if it gets 
initialized in probe as well, then this is fine.

Reviewed-by: Tomasz Figa <t.figa@...sung.com>

Best regards,
Tomasz

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