On 29/04/16 05:48, Shawn Lin wrote:
> Enhanced strobe stuff currently is beyond the scope
> of Secure Digital Host Controller Interface. So we can't
> find a register here to enable/disable it. We experct
> variant drivers to finish the details according to their
> vendor settings.
>
> Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
> ---
>
> Changes in v2: None
>
> drivers/mmc/host/sdhci.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 94cffa7..a04e4c4 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2049,6 +2049,16 @@ out_unlock:
> return err;
> }
>
> +static int sdhci_prepare_enhanced_strobe(struct mmc_host *mmc, bool enable)
> +{
> + /*
> + * Currently we can't find a register to enable enhanced strobe
> + * function for standard sdhci, so we expect variant drivers to
> + * overwrite it.
> + */
> + return -EINVAL;
> +}
Since we don't need it at the moment, let's not have it at all for now.
> +
> static int sdhci_select_drive_strength(struct mmc_card *card,
> unsigned int max_dtr, int host_drv,
> int card_drv, int *drv_type)
> @@ -2158,6 +2168,7 @@ static const struct mmc_host_ops sdhci_ops = {
> .enable_sdio_irq = sdhci_enable_sdio_irq,
> .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
> .prepare_hs400_tuning = sdhci_prepare_hs400_tuning,
> + .prepare_enhanced_strobe = sdhci_prepare_enhanced_strobe,
> .execute_tuning = sdhci_execute_tuning,
> .select_drive_strength = sdhci_select_drive_strength,
> .card_event = sdhci_card_event,
>
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