Re: [PATCH] mmc: dw_mmc: add busmode selection support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> 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 <girish.shivananjappa@xxxxxxxxxx>
>> ---
>>  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)
>>
>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux USB Devel]     [Linux Media]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux