linux-kernel - Re: [PATCH] mmc: Test bus-width for old MMC devices (v2)

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Date:	Sun, 2 Jan 2011 19:52:46 +0000
From:	Chris Ball <cjb@...top.org>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	zhangfei gao <zhangfei.gao@...il.com>,
	Philip Rakity <prakity@...vell.com>,
	Aries Lee <arieslee@...cron.com>, Qiming Wu <wuqm@...vell.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: Test bus-width for old MMC devices (v2)

Hi Takashi,

On Wed, Dec 22, 2010 at 09:59:44AM +0100, Takashi Iwai wrote:
> Subject: [PATCH] mmc: fix mmc_set_bus_width_ddr() call without bus-width-test cap
> 
> With the bus-width test patch, mmc_set_bus_width*() isn't called properly
> when the driver doesn't set MMC_CAP_BUS_WIDTH and no DDR mode.
> This patch fixes the regression by moving the call up before the cap test.
> 
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> ---
>  drivers/mmc/core/mmc.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 1d8409f..c86dd73 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -558,6 +558,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
>  					 EXT_CSD_BUS_WIDTH,
>  					 ext_csd_bits[idx][0]);
>  			if (!err) {
> +				mmc_set_bus_width_ddr(card->host,
> +						      bus_width, MMC_SDR_MODE);
>  				/*
>  				 * If controller can't handle bus width test,
>  				 * use the highest bus width to maintain
> @@ -565,8 +567,6 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
>  				 */
>  				if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
>  					break;
> -				mmc_set_bus_width_ddr(card->host,
> -						      bus_width, MMC_SDR_MODE);
>  				err = mmc_bus_test(card, bus_width);
>  				if (!err)
>  					break;

Thanks, I've pushed this fix to mmc-next now.

-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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