[v2, 01/11] mmc: add a reinit() API

[Peng Fan]

> Subject: [v2, 01/11] mmc: add a reinit() API
> 
> For DM_MMC, the controller re-initialization is needed to clear old
> configuration for mmc rescan.
> 
> Signed-off-by: Yangbo Lu <yangbo.lu at nxp.com>
> ---
> Changes for v2:
> 	- None.
> ---
>  drivers/mmc/mmc-uclass.c | 15 +++++++++++++++
>  drivers/mmc/mmc.c        |  8 ++++++--
>  include/mmc.h            | 10 ++++++++++
>  3 files changed, 31 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c index
> c5b7872..b9f0880 100644
> --- a/drivers/mmc/mmc-uclass.c
> +++ b/drivers/mmc/mmc-uclass.c
> @@ -170,6 +170,21 @@ int mmc_deferred_probe(struct mmc *mmc)
>  	return dm_mmc_deferred_probe(mmc->dev);  }
> 
> +int dm_mmc_reinit(struct udevice *dev)
> +{
> +	struct dm_mmc_ops *ops = mmc_get_ops(dev);
> +
> +	if (ops->reinit)
> +		return ops->reinit(dev);
> +
> +	return 0;
> +}
> +
> +int mmc_reinit(struct mmc *mmc)
> +{
> +	return dm_mmc_reinit(mmc->dev);
> +}
> +
>  int mmc_of_parse(struct udevice *dev, struct mmc_config *cfg)  {
>  	int val;
> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index
> 50f47d4..a53f93a 100644
> --- a/drivers/mmc/mmc.c
> +++ b/drivers/mmc/mmc.c
> @@ -2813,13 +2813,17 @@ int mmc_get_op_cond(struct mmc *mmc)
>  		return err;
> 
>  #if CONFIG_IS_ENABLED(DM_MMC)
> -	/* The device has already been probed ready for use */
> +	/*
> +	 * Re-initialization is needed to clear old configuration for
> +	 * mmc rescan.

You mean cmd "mmc rescan" ?

> +	 */
> +	err = mmc_reinit(mmc);

Probe could not provide what you need? You need a different settings?

Regards,
Peng.

>  #else
>  	/* made sure it's not NULL earlier */
>  	err = mmc->cfg->ops->init(mmc);
> +#endif
>  	if (err)
>  		return err;
> -#endif
>  	mmc->ddr_mode = 0;
> 
>  retry:
> diff --git a/include/mmc.h b/include/mmc.h index 8256219..161b8bc 100644
> --- a/include/mmc.h
> +++ b/include/mmc.h
> @@ -422,6 +422,14 @@ struct dm_mmc_ops {
>  	 */
>  	int (*deferred_probe)(struct udevice *dev);
>  	/**
> +	 * reinit() - Re-initialization to clear old configuration for
> +	 * mmc rescan.
> +	 *
> +	 * @dev:	Device to reinit
> +	 * @return 0 if Ok, -ve if error
> +	 */
> +	int (*reinit)(struct udevice *dev);
> +	/**
>  	 * send_cmd() - Send a command to the MMC device
>  	 *
>  	 * @dev:	Device to receive the command
> @@ -518,6 +526,7 @@ int dm_mmc_execute_tuning(struct udevice *dev,
> uint opcode);  int dm_mmc_wait_dat0(struct udevice *dev, int state, int
> timeout_us);  int dm_mmc_host_power_cycle(struct udevice *dev);  int
> dm_mmc_deferred_probe(struct udevice *dev);
> +int dm_mmc_reinit(struct udevice *dev);
>  int dm_mmc_get_b_max(struct udevice *dev, void *dst, lbaint_t blkcnt);
> 
>  /* Transition functions for compatibility */ @@ -529,6 +538,7 @@ int
> mmc_wait_dat0(struct mmc *mmc, int state, int timeout_us);  int
> mmc_set_enhanced_strobe(struct mmc *mmc);  int
> mmc_host_power_cycle(struct mmc *mmc);  int
> mmc_deferred_probe(struct mmc *mmc);
> +int mmc_reinit(struct mmc *mmc);
>  int mmc_get_b_max(struct mmc *mmc, void *dst, lbaint_t blkcnt);
> 
>  #else
> --
> 2.7.4