mmc: dw_mmc: fix num_slots setting

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>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 0394ea8..242f9a0 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -2879,12 +2879,7 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
                return ERR_PTR(-ENOMEM);
 
        /* find out number of slots supported */
-       if (of_property_read_u32(dev->of_node, "num-slots",
-                               &pdata->num_slots)) {
-               dev_info(dev,
-                        "num-slots property not found, assuming 1 slot is available\n");
-               pdata->num_slots = 1;
-       }
+       of_property_read_u32(np, "num-slots", &pdata->num_slots);
 
        if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
                dev_info(dev,
@@ -2960,12 +2955,6 @@ 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");
@@ -3124,7 +3113,15 @@ 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->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,