On 24 July 2012 16:39, Jaehoon Chung <[email protected]> wrote:
> Hi Girish,
>
> Well..just tested on my board.
> this patch didn't work.(eMMC card didn't initialize)
> meaning of ios->bus_mode and synosys's bus_mode is same?
> How did you test this patch?
Tested it on exynos5 board using dt patches of thomas (with some
modification to his patch)
>
> Best Regards,
> Jaehoon Chung
>
> On 07/23/2012 08:16 PM, Girish K S wrote:
>> Synopsis Designware host controller has suppport for open
>> drain mode selection. During the mmc card initialization the
>> host controller can select the open-drain bit to allow the device
>> initialization in the open-drain mode. Once the device enters
>> the standby mode this bit can be reset to enter push-pull mode.
>>
>> Signed-off-by: Girish K S <[email protected]>
>> ---
>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++
>> drivers/mmc/host/dw_mmc.h | 1 +
>> 2 files changed, 15 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
>> index 72dc3cd..da11e5a 100644
>> --- a/drivers/mmc/host/dw_mmc.c
>> +++ b/drivers/mmc/host/dw_mmc.c
>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct
>> mmc_request *mrq)
>> spin_unlock_bh(&host->lock);
>> }
>>
>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot)
>> +{
>> + struct mmc_ios *ios = &slot->mmc->ios;
>> + u32 reg;
>> +
>> + reg = mci_readl(slot->host, CTRL);
>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD);
>> + else
>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD);
>> +}
>> +
>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>> {
>> struct dw_mci_slot *slot = mmc_priv(mmc);
>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct
>> mmc_ios *ios)
>> default:
>> break;
>> }
>> +
>> + dw_mci_set_busmode(slot);
>> }
>>
>> static int dw_mci_get_ro(struct mmc_host *mmc)
>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
>> index 15c27e1..1a53fb2 100644
>> --- a/drivers/mmc/host/dw_mmc.h
>> +++ b/drivers/mmc/host/dw_mmc.h
>> @@ -67,6 +67,7 @@
>>
>> /* Control register defines */
>> #define SDMMC_CTRL_USE_IDMAC BIT(25)
>> +#define SDMMC_CTRL_ENABLE_OD BIT(24)
>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11)
>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10)
>> #define SDMMC_CTRL_SEND_CCSD BIT(9)
>>
>
>
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