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

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Date:	Mon, 08 Aug 2011 10:38:44 +0900
From:	Seungwon Jeon <tgih.jun@...sung.com>
To:	'Jae hoon Chung' <jh80.chung@...il.com>,
	'Will Newton' <will.newton@...il.com>
Cc:	linux-mmc@...r.kernel.org, cjb@...top.org,
	linux-kernel@...r.kernel.org
Subject: RE: [PATCH] mmc: dw_mmc: Fix DDR mode support.

Jaehoon Chung wrote:
> 
> 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?

Thank you for your comment.
Of course, I have considered appropriate location for MMC_CAP_MMC_HIGHSPEED.
But it seems to be difficult to distinguish a difference between MMC_CAP_SD_HIGHSPEED and MMC_CAP_MMC_HIGHSPEED,
if DW_MCI_QUIRK_HIGHSPEED is defined.

Beset regards,
Seungwon Jeon.

> 
> 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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> >
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