Monday, October 29, 2012, Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
> After power-on, must be ensured at least 74~80 clocks before sending any first command.
> To ensure, it's good that dw_mci_setup_bus() is located at dw_mci_set_ios
> instead of __dw_mci_start_request()
After power-up, host driver sets 'DW_MMC_CARD_NEED_INIT' flag, right?
And then, this flag help to add SDMMC_CMD_INIT flag into CMD, when __dw_mci_start_request is executed.
74~80 clocks is ensured with SDMMC_CMD_INIT regardless location change, isn't it?
I mentioned this part in previous mail. Could you check it?
Thanks,
Seungwon Jeon
>
> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> Acked-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> ------
> Changelog V2:
> - Modified the commit-message.
> ---
> drivers/mmc/host/dw_mmc.c | 6 +++---
> 1 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 4b2bedc..de79093 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -682,9 +682,6 @@ static void __dw_mci_start_request(struct dw_mci *host,
> if (host->pdata->select_slot)
> host->pdata->select_slot(slot->id);
>
> - /* Slot specific timing and width adjustment */
> - dw_mci_setup_bus(slot);
> -
> host->cur_slot = slot;
> host->mrq = mrq;
>
> @@ -810,6 +807,9 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> if (slot->host->drv_data->set_ios)
> slot->host->drv_data->set_ios(slot->host, ios);
>
> + /* Slot specific timing and width adjustment */
> + dw_mci_setup_bus(slot);
> +
> switch (ios->power_mode) {
> case MMC_POWER_UP:
> set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
> --
> 1.7.4.1
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