diff mbox

[v2,5/6] mmc: sdhci: implement enhanced strobe callback

Message ID 1461898103-29026-1-git-send-email-shawn.lin@rock-chips.com (mailing list archive)
State New, archived
Headers show

Commit Message

Shawn Lin April 29, 2016, 2:48 a.m. UTC
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@rock-chips.com>
---

Changes in v2: None

 drivers/mmc/host/sdhci.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

Comments

Adrian Hunter May 9, 2016, 12:02 p.m. UTC | #1
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@rock-chips.com>
> ---
> 
> 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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diff mbox

Patch

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;
+}
+
 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,