diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c
index 3a5f6ac..7a42966 100644
--- a/drivers/mmc/mmci.c
+++ b/drivers/mmc/mmci.c
@@ -20,6 +20,7 @@
 #include <linux/mmc/host.h>
 #include <linux/mmc/protocol.h>
 
+#include <asm/div64.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/scatterlist.h>
@@ -70,6 +71,7 @@
 static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 {
 	unsigned int datactrl, timeout, irqmask;
+	unsigned long long clks;
 	void __iomem *base;
 
 	DBG(host, "blksz %04x blks %04x flags %08x\n",
@@ -81,9 +83,10 @@
 
 	mmci_init_sg(host, data);
 
-	timeout = data->timeout_clks +
-		  ((unsigned long long)data->timeout_ns * host->cclk) /
-		   1000000000ULL;
+	clks = (unsigned long long)data->timeout_ns * host->cclk;
+	do_div(clks, 1000000000UL);
+
+	timeout = data->timeout_clks + (unsigned int)clks;
 
 	base = host->base;
 	writel(timeout, base + MMCIDATATIMER);
diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
index b7fbd30..0c41d4b 100644
--- a/drivers/mmc/wbsd.c
+++ b/drivers/mmc/wbsd.c
@@ -54,28 +54,6 @@
 #define DBGF(x...)	do { } while (0)
 #endif
 
-#ifdef CONFIG_MMC_DEBUG
-void DBG_REG(int reg, u8 value)
-{
-	int i;
-	
-	printk(KERN_DEBUG "wbsd: Register %d: 0x%02X %3d '%c' ",
-		reg, (int)value, (int)value, (value < 0x20)?'.':value);
-	
-	for (i = 7;i >= 0;i--)
-	{
-		if (value & (1 << i))
-			printk("x");
-		else
-			printk(".");
-	}
-	
-	printk("\n");
-}
-#else
-#define DBG_REG(r, v) do {}  while (0)
-#endif
-
 /*
  * Device resources
  */
@@ -92,6 +70,13 @@
 
 #endif /* CONFIG_PNP */
 
+static const int config_ports[] = { 0x2E, 0x4E };
+static const int unlock_codes[] = { 0x83, 0x87 };
+
+static const int valid_ids[] = {
+	0x7112,
+	};
+
 #ifdef CONFIG_PNP
 static unsigned int nopnp = 0;
 #else
@@ -1051,6 +1036,20 @@
 \*****************************************************************************/
 
 /*
+ * Helper function for card detection
+ */
+static void wbsd_detect_card(unsigned long data)
+{
+	struct wbsd_host *host = (struct wbsd_host*)data;
+	
+	BUG_ON(host == NULL);
+	
+	DBG("Executing card detection\n");
+	
+	mmc_detect_change(host->mmc);	
+}
+
+/*
  * Tasklets
  */
 
@@ -1075,7 +1074,6 @@
 {
 	struct wbsd_host* host = (struct wbsd_host*)param;
 	u8 csr;
-	int change = 0;
 	
 	spin_lock(&host->lock);
 	
@@ -1094,14 +1092,20 @@
 		{
 			DBG("Card inserted\n");
 			host->flags |= WBSD_FCARD_PRESENT;
-			change = 1;
+			
+			/*
+			 * Delay card detection to allow electrical connections
+			 * to stabilise.
+			 */
+			mod_timer(&host->timer, jiffies + HZ/2);
 		}
+		
+		spin_unlock(&host->lock);
 	}
 	else if (host->flags & WBSD_FCARD_PRESENT)
 	{
 		DBG("Card removed\n");
 		host->flags &= ~WBSD_FCARD_PRESENT;
-		change = 1;
 		
 		if (host->mrq)
 		{
@@ -1112,15 +1116,14 @@
 			host->mrq->cmd->error = MMC_ERR_FAILED;
 			tasklet_schedule(&host->finish_tasklet);
 		}
-	}
-	
-	/*
-	 * Unlock first since we might get a call back.
-	 */
-	spin_unlock(&host->lock);
+		
+		/*
+		 * Unlock first since we might get a call back.
+		 */
+		spin_unlock(&host->lock);
 
-	if (change)
 		mmc_detect_change(host->mmc);
+	}
 }
 
 static void wbsd_tasklet_fifo(unsigned long param)
@@ -1325,6 +1328,13 @@
 	spin_lock_init(&host->lock);
 	
 	/*
+	 * Set up detection timer
+	 */
+	init_timer(&host->timer);
+	host->timer.data = (unsigned long)host;
+	host->timer.function = wbsd_detect_card;
+	
+	/*
 	 * Maximum number of segments. Worst case is one sector per segment
 	 * so this will be 64kB/512.
 	 */
@@ -1351,11 +1361,17 @@
 static void __devexit wbsd_free_mmc(struct device* dev)
 {
 	struct mmc_host* mmc;
+	struct wbsd_host* host;
 	
 	mmc = dev_get_drvdata(dev);
 	if (!mmc)
 		return;
 	
+	host = mmc_priv(mmc);
+	BUG_ON(host == NULL);
+	
+	del_timer_sync(&host->timer);
+	
 	mmc_free_host(mmc);
 	
 	dev_set_drvdata(dev, NULL);
diff --git a/drivers/mmc/wbsd.h b/drivers/mmc/wbsd.h
index 864f3082..661a9f6 100644
--- a/drivers/mmc/wbsd.h
+++ b/drivers/mmc/wbsd.h
@@ -8,13 +8,6 @@
  * published by the Free Software Foundation.
  */
 
-const int config_ports[] = { 0x2E, 0x4E };
-const int unlock_codes[] = { 0x83, 0x87 };
-
-const int valid_ids[] = {
-	0x7112,
-	};
-
 #define LOCK_CODE		0xAA
 
 #define WBSD_CONF_SWRST		0x02
@@ -187,4 +180,6 @@
 	struct tasklet_struct	timeout_tasklet;
 	struct tasklet_struct	finish_tasklet;
 	struct tasklet_struct	block_tasklet;
+	
+	struct timer_list	timer;		/* Card detection timer */
 };