[PATCH v2] mmc: fsl_esdhc_imx: add wait_dat0() support

[Jaehoon Chung]

Dear Haibo,

On 11/5/20 3:57 PM, haibo.chen at nxp.com wrote:
> From: Haibo Chen <haibo.chen at nxp.com>
> 
> Add wait_dat0() support, upper layer will use this callback.
> 
> Signed-off-by: Haibo Chen <haibo.chen at nxp.com>

Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>

Best Regards,
Jaehoon Chung

> ---
>  drivers/mmc/fsl_esdhc_imx.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/mmc/fsl_esdhc_imx.c b/drivers/mmc/fsl_esdhc_imx.c
> index 22040c67a8..29592d1f2c 100644
> --- a/drivers/mmc/fsl_esdhc_imx.c
> +++ b/drivers/mmc/fsl_esdhc_imx.c
> @@ -1646,6 +1646,20 @@ static int fsl_esdhc_set_enhanced_strobe(struct udevice *dev)
>  }
>  #endif
>  
> +static int fsl_esdhc_wait_dat0(struct udevice *dev, int state,
> +				int timeout_us)
> +{
> +	int ret;
> +	u32 tmp;
> +	struct fsl_esdhc_priv *priv = dev_get_priv(dev);
> +	struct fsl_esdhc *regs = priv->esdhc_regs;
> +
> +	ret = readx_poll_timeout(esdhc_read32, &regs->prsstat, tmp,
> +				!!(tmp & PRSSTAT_DAT0) == !!state,
> +				timeout_us);
> +	return ret;
> +}
> +
>  static const struct dm_mmc_ops fsl_esdhc_ops = {
>  	.get_cd		= fsl_esdhc_get_cd,
>  	.send_cmd	= fsl_esdhc_send_cmd,
> @@ -1656,6 +1670,7 @@ static const struct dm_mmc_ops fsl_esdhc_ops = {
>  #if CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
>  	.set_enhanced_strobe = fsl_esdhc_set_enhanced_strobe,
>  #endif
> +	.wait_dat0 = fsl_esdhc_wait_dat0,
>  };
>  #endif
>  
>