[PATCH 4/9] mmc: sdhci: add a callback for using tuning block

[Adrian Hunter]

On 02/03/17 11:47, Yangbo Lu wrote:
> Some non-standard SD host controllers may use tuning block
> for executing tuning procedure.

If you need to set something up before tuning, you should be able to do that
by hooking the host operation, for example see xenon_execute_tuning() in
sdhci-xenon.c

> 
> Signed-off-by: Yangbo Lu <yangbo.lu at nxp.com>
> ---
>  drivers/mmc/host/sdhci.c | 3 +++
>  drivers/mmc/host/sdhci.h | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 3c9a924..051b192 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2166,6 +2166,9 @@ int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>  		goto out_unlock;
>  	}
>  
> +	if (host->ops->set_tuning_block)
> +		host->ops->set_tuning_block(host);
> +
>  	host->mmc->retune_period = tuning_count;
>  
>  	sdhci_start_tuning(host);
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 04af687..d43519b 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -568,6 +568,7 @@ struct sdhci_ops {
>  					 int card_drv, int *drv_type);
>  	int	(*start_signal_voltage_switch)(struct sdhci_host *host,
>  					       unsigned char signal_voltage);
> +	void	(*set_tuning_block)(struct sdhci_host *host);
>  };
>  
>  #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
>