[U-Boot,13/22] mmc: Add a new callback function to enable/disable vdd

From: Kishon Vijay Abraham I <kishon@ti.com>

Add a new callback function *set_vdd* which can be used
by the platform mmc driver to enable or disable vdd.
The mmc core can use *mmc_set_vdd* in order to invoke
the callback function. This will be used during power cycle
where the specification requires vdd to be disabled for
1ms and enabled again.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
---
 drivers/mmc/mmc-uclass.c | 14 ++++++++++++++
 drivers/mmc/mmc.c        | 12 +++++++++++-
 include/mmc.h            | 12 ++++++++++++
 3 files changed, 37 insertions(+), 1 deletion(-)

Hi,

On 12 May 2017 at 12:16, Jean-Jacques Hiblot <jjhiblot@ti.com> wrote:
> From: Kishon Vijay Abraham I <kishon@ti.com>
>
> Add a new callback function *set_vdd* which can be used
> by the platform mmc driver to enable or disable vdd.
> The mmc core can use *mmc_set_vdd* in order to invoke
> the callback function. This will be used during power cycle
> where the specification requires vdd to be disabled for
> 1ms and enabled again.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
> ---
>  drivers/mmc/mmc-uclass.c | 14 ++++++++++++++
>  drivers/mmc/mmc.c        | 12 +++++++++++-
>  include/mmc.h            | 12 ++++++++++++
>  3 files changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
> index 9c07871..e1f7995 100644
> --- a/drivers/mmc/mmc-uclass.c
> +++ b/drivers/mmc/mmc-uclass.c
> @@ -52,6 +52,20 @@ int mmc_set_ios(struct mmc *mmc)
>         return dm_mmc_set_ios(mmc->dev);
>  }
>
> +int dm_mmc_set_vdd(struct udevice *dev, bool enable)
> +{
> +       struct dm_mmc_ops *ops = mmc_get_ops(dev);
> +
> +       if (!ops->set_vdd)
> +               return -ENOSYS;
> +       return ops->set_vdd(dev, enable);
> +}
> +
> +int mmc_set_vdd(struct mmc *mmc, bool enable)
> +{
> +       return dm_mmc_set_vdd(mmc->dev, enable);
> +}
> +
>  int dm_mmc_get_wp(struct udevice *dev)
>  {
>         struct dm_mmc_ops *ops = mmc_get_ops(dev);
> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
> index 10af81d..d40a22b 100644
> --- a/drivers/mmc/mmc.c
> +++ b/drivers/mmc/mmc.c
> @@ -1194,6 +1194,16 @@ static inline int bus_width(uint cap)
>  }
>
>  #ifndef CONFIG_DM_MMC_OPS

Please don't do this. This option is the current way of doing things -
we should not support features in legacy code. Instead, boards should
upgrade to DM to get new features.

> +static int mmc_set_vdd(struct mmc *mmc, bool enable)
> +{
> +       int ret = 0;
> +
> +       if (mmc->cfg->ops->set_vdd)
> +               ret = mmc->cfg->ops->set_vdd(mmc, enable);
> +
> +       return ret;
> +}
> +
>  static int mmc_set_ios(struct mmc *mmc)
>  {
>         int ret = 0;
> @@ -1942,7 +1952,7 @@ int mmc_start_init(struct mmc *mmc)
>                 return err;
>  #endif
>         mmc->ddr_mode = 0;
> -
> +       mmc_set_vdd(mmc, true);
>         /* First try to set 3.3V. If it fails set to 1.8V */
>         err = mmc_set_signal_voltage(mmc, MMC_SIGNAL_VOLTAGE_330);
>         if (err != 0)
> diff --git a/include/mmc.h b/include/mmc.h
> index 89cb26c..43d37a4 100644
> --- a/include/mmc.h
> +++ b/include/mmc.h
> @@ -352,6 +352,15 @@ struct dm_mmc_ops {
>         int (*set_ios)(struct udevice *dev);
>
>         /**
> +        * set_vdd() - Enable or Disable the Vdd line
> +        *
> +        * @dev:        Device to update
> +        * @enable:     true or false to enable or disable Vdd respectively
> +        * @return 0 if OK, -ve on error
> +        */
> +       int (*set_vdd)(struct udevice *dev, bool enable);
> +
> +       /**
>          * get_cd() - See whether a card is present
>          *
>          * @dev:        Device to check
> @@ -373,11 +382,13 @@ struct dm_mmc_ops {
>  int dm_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
>                     struct mmc_data *data);
>  int dm_mmc_set_ios(struct udevice *dev);
> +int dm_mmc_set_vdd(struct udevice *dev, bool enable);
>  int dm_mmc_get_cd(struct udevice *dev);
>  int dm_mmc_get_wp(struct udevice *dev);
>
>  /* Transition functions for compatibility */
>  int mmc_set_ios(struct mmc *mmc);
> +int mmc_set_vdd(struct mmc *mmc, bool enable);
>  int mmc_getcd(struct mmc *mmc);
>  int mmc_getwp(struct mmc *mmc);
>
> @@ -387,6 +398,7 @@ struct mmc_ops {
>                         struct mmc_cmd *cmd, struct mmc_data *data);
>         int (*set_ios)(struct mmc *mmc);
>         int (*init)(struct mmc *mmc);
> +       int (*set_vdd)(struct mmc *mmc, bool enable);

Just drop this.

>         int (*getcd)(struct mmc *mmc);
>         int (*getwp)(struct mmc *mmc);
>  };
> --
> 1.9.1
>

Regards,
Simon