linux-kernel - Re: [PATCH] mmc: dw_mmc: Fix DDR mode support.

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Message-ID: <CAELcNGTNA83nD3kCh=-BJ6DxRqnNaRznn3mTd5PVY_fRArp+fA@mail.gmail.com>
Date:	Fri, 5 Aug 2011 22:35:36 +0100
From:	Jae hoon Chung <jh80.chung@...il.com>
To:	Will Newton <will.newton@...il.com>
Cc:	Seungwon Jeon <tgih.jun@...sung.com>, linux-mmc@...r.kernel.org,
	cjb@...top.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: dw_mmc: Fix DDR mode support.

Hi Seungwon

This patch is looks fine to me..

Just ask to you...Don't you want to locate MMC_CAP_MMC_HIGHSPEED in platdata?

Regards,
Jaehoon Chung


2011/8/5 Will Newton <will.newton@...il.com>:
> On Fri, Aug 5, 2011 at 4:35 AM, Seungwon Jeon <tgih.jun@...sung.com> wrote:
>> Host driver can't get a hint of DDR mode through ios->ddr flag anymore.
>> ios->timing is currently used to inform DDR mode as a substitute.
>> And capability of MMC_CAP_MMC_HIGHSPEED is added for DDR support.
>>
>> Signed-off-by: Seungwon Jeon <tgih.jun@...sung.com>
>> ---
>>  drivers/mmc/host/dw_mmc.c |    4 ++--
>>  1 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
>> index d65511e..b412a1d 100644
>> --- a/drivers/mmc/host/dw_mmc.c
>> +++ b/drivers/mmc/host/dw_mmc.c
>> @@ -699,7 +699,7 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>>        }
>>
>>        /* DDR mode set */
>> -       if (ios->ddr) {
>> +       if (ios->timing == MMC_TIMING_UHS_DDR50) {
>>                regs = mci_readl(slot->host, UHS_REG);
>>                regs |= (0x1 << slot->id) << 16;
>>                mci_writel(slot->host, UHS_REG, regs);
>> @@ -1646,7 +1646,7 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>>                        mmc->caps |= MMC_CAP_4_BIT_DATA;
>>
>>        if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
>> -               mmc->caps |= MMC_CAP_SD_HIGHSPEED;
>> +               mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
>>
>>  #ifdef CONFIG_MMC_DW_IDMAC
>>        mmc->max_segs = host->ring_size;
>> --
>> 1.7.0.4
>
> Acked-by: Will Newton <will.newton@...tec.com>
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