linux-kernel - Re: [PATCH] mmc: Enable bus-width tests on SDHCI host

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Date:	Wed, 15 Dec 2010 20:40:53 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Chris Ball <cjb@...top.org>
Cc:	Philip Rakity <prakity@...vell.com>,
	Aries Lee <arieslee@...cron.com>,
	zhangfei gao <zhangfei.gao@...il.com>, wuqm@...vell.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: Enable bus-width tests on SDHCI host

At Wed, 15 Dec 2010 14:17:27 +0100,
Takashi Iwai wrote:
> 
> Let's enable the new bus-width tests on SDHCI hosts unless 1-bit data
> is set forcibly.
> 
> Signed-off-by: Takashi Iwai <tiwai@...e.de>

Please drop this patch.

After a short discussion with Philip, we concluded that it's safer to
enable in individual platform side.

I'll send a patch for enabling the feature for JMicron chips later again.


thanks,

Takashi

> ---
> 
> This is a patch to be applied after
>   "mmc: Test bus-width for old MMC devices (v2)"
> 
> 
>  drivers/mmc/host/sdhci.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 0502738..51f5209 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1888,8 +1888,10 @@ int sdhci_add_host(struct sdhci_host *host)
>  	 * their platform code before calling sdhci_add_host(), and we
>  	 * won't assume 8-bit width for hosts without that CAP.
>  	 */
> -	if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
> +	if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) {
>  		mmc->caps |= MMC_CAP_4_BIT_DATA;
> +		mmc->caps |= MMC_CAP_BUS_WIDTH_TEST;
> +	}
>  
>  	if (caps & SDHCI_CAN_DO_HISPD)
>  		mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
> -- 
> 1.7.3.1
> 
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