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

[Jaehoon Chung]

On 11/2/20 8:17 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>
> ---
>  drivers/mmc/fsl_esdhc_imx.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/mmc/fsl_esdhc_imx.c b/drivers/mmc/fsl_esdhc_imx.c
> index 22040c67a8..dc6a6006fa 100644
> --- a/drivers/mmc/fsl_esdhc_imx.c
> +++ b/drivers/mmc/fsl_esdhc_imx.c
> @@ -1646,6 +1646,28 @@ 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 = -ETIMEDOUT;
> +	bool dat0_high;
> +	bool target_dat0_high = !!state;
> +	struct fsl_esdhc_priv *priv = dev_get_priv(dev);
> +	struct fsl_esdhc *regs = priv->esdhc_regs;
> +
> +	timeout_us = DIV_ROUND_UP(timeout_us, 10); /* check every 10 us. */
> +	while (timeout_us--) {
> +		dat0_high = !!(esdhc_read32(&regs->prsstat) & PRSSTAT_DAT0);
> +		if (dat0_high == target_dat0_high) {
> +			ret = 0;
> +			break;
> +		}
> +	udelay(10);

Fix indent. 
And can't use wait_for_bit_xx()?

Best  Regards,
Jaehoon Chung

> +	}
> +
> +	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 +1678,7 @@ 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
>  
>