Re: [PATCH] mmc: dw_mmc: fix num_slots setting

[Shawn Lin]

Hi Jaehoon,

On 2016/2/2 12:42, Jaehoon Chung wrote:
> Hi, Shawn.
>
> On 01/22/2016 04:43 PM, Shawn Lin wrote:
> > This patch make num_slots to 1 if pdata->num_slot is not
> > defined. Meanwhile, we need to make sure num_slots should
> > not larger that the supported slots
> >
> > Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
> > ---
> >
> >   drivers/mmc/host/dw_mmc.c | 16 +++++++++-------
> >   1 file changed, 9 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> > index 7128351..065a8f5 100644
> > --- a/drivers/mmc/host/dw_mmc.c
> > +++ b/drivers/mmc/host/dw_mmc.c
> > @@ -2949,12 +2949,6 @@ int dw_mci_probe(struct dw_mci *host)
> >   		}
> >   	}
> >
> > -	if (host->pdata->num_slots < 1) {
> > -		dev_err(host->dev,
> > -			"Platform data must supply num_slots.\n");
> > -		return -ENODEV;
> > -	}
> > -
> >   	host->biu_clk = devm_clk_get(host->dev, "biu");
> >   	if (IS_ERR(host->biu_clk)) {
> >   		dev_dbg(host->dev, "biu clock not available\n");
> > @@ -3111,7 +3105,15 @@ int dw_mci_probe(struct dw_mci *host)
> >   	if (host->pdata->num_slots)
> >   		host->num_slots = host->pdata->num_slots;
> >   	else
> > -		host->num_slots = SDMMC_GET_SLOT_NUM(mci_readl(host, HCON));
> > +		host->num_slots = 1;
>
> If host->nums_slots is set to 1, it assumes that there is one slot.
> Then the code in dw_mci_parse_dt() can be removed
>
>                  dev_info(dev,
>                           "num-slots property not found, assuming 1 slot is available\n");
>                  pdata->num_slots = 1;

Good catch. I will respin v2 to move it.

Thanks.
> Best Regards,
> Jaehoon Chung
>
>
> > +
> > +	if (host->num_slots < 1 ||
> > +	    host->num_slots > SDMMC_GET_SLOT_NUM(mci_readl(host, HCON))) {
> > +		dev_err(host->dev,
> > +			"Platform data must supply correct num_slots.\n");
> > +		ret = -ENODEV;
> > +		goto err_clk_ciu;
> > +	}
> >
> >   	/*
> >   	 * Enable interrupts for command done, data over, data empty,


--
Best Regards
Shawn Lin