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

Jaehoon Chung
2016-02-02T04:42:43Z

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@rock-chips.com>
> ---
>
> 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;

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,
>