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

[Bough Chen]

> -----Original Message-----
> From: Jaehoon Chung [mailto:jh80.chung at samsung.com]
> Sent: 2020年11月3日 5:52
> To: Bough Chen <haibo.chen at nxp.com>; Peng Fan <peng.fan at nxp.com>;
> u-boot at lists.denx.de
> Cc: dl-uboot-imx <uboot-imx at nxp.com>
> Subject: Re: [PATCH] mmc: fsl_esdhc_imx: add wait_dat0() support
> 
> 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.

Yes, will fix.

> And can't use wait_for_bit_xx()?

Just to align with the mmc_wait_dat0() defined in mmc-uclass.c, named fsl_esdhc_wait_dat0 should be more readable.

Best Regards
Haibo Chen
> 
> 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
> >
> >