[MMC] Allow detection/removal to be delayed

Change mmc_detect_change() to take a delay argument such that
the detection of card insertions and removals can be delayed
according to the requirements of the host driver or platform.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/mmc/mmc.c

@@ -1079,13 +1079,17 @@ static void mmc_setup(struct mmc_host *host)
 /**
  *	mmc_detect_change - process change of state on a MMC socket
  *	@host: host which changed state.
+ *	@delay: optional delay to wait before detection (jiffies)
  *
  *	All we know is that card(s) have been inserted or removed
  *	from the socket(s).  We don't know which socket or cards.
  */
-void mmc_detect_change(struct mmc_host *host)
+void mmc_detect_change(struct mmc_host *host, unsigned long delay)
 {
-	schedule_work(&host->detect);
+	if (delay)
+		schedule_delayed_work(&host->detect, delay);
+	else
+		schedule_work(&host->detect);
 }
 
 EXPORT_SYMBOL(mmc_detect_change);
@@ -1189,7 +1193,7 @@ int mmc_add_host(struct mmc_host *host)
 	ret = mmc_add_host_sysfs(host);
 	if (ret == 0) {
 		mmc_power_off(host);
-		mmc_detect_change(host);
+		mmc_detect_change(host, 0);
 	}
 
 	return ret;
@@ -1259,7 +1263,7 @@ EXPORT_SYMBOL(mmc_suspend_host);
  */
 int mmc_resume_host(struct mmc_host *host)
 {
-	mmc_detect_change(host);
+	mmc_detect_change(host, 0);
 
 	return 0;
 }

drivers/mmc/mmci.c

@@ -442,7 +442,7 @@ static void mmci_check_status(unsigned long data)
 
 	status = host->plat->status(mmc_dev(host->mmc));
 	if (status ^ host->oldstat)
-		mmc_detect_change(host->mmc);
+		mmc_detect_change(host->mmc, 0);
 
 	host->oldstat = status;
 	mod_timer(&host->timer, jiffies + HZ);

drivers/mmc/pxamci.c

@@ -423,7 +423,7 @@ static void pxamci_dma_irq(int dma, void *devid, struct pt_regs *regs)
 
 static irqreturn_t pxamci_detect_irq(int irq, void *devid, struct pt_regs *regs)
 {
-	mmc_detect_change(devid);
+	mmc_detect_change(devid, 0);
 	return IRQ_HANDLED;
 }
 

drivers/mmc/wbsd.c

@@ -1122,7 +1122,7 @@ static void wbsd_detect_card(unsigned long data)
 	
 	DBG("Executing card detection\n");
 	
-	mmc_detect_change(host->mmc);	
+	mmc_detect_change(host->mmc, 0);	
 }
 
 /*
@@ -1198,7 +1198,7 @@ static void wbsd_tasklet_card(unsigned long param)
 		 */
 		spin_unlock(&host->lock);
 
-		mmc_detect_change(host->mmc);
+		mmc_detect_change(host->mmc, 0);
 	}
 	else
 		spin_unlock(&host->lock);

include/linux/mmc/host.h

@@ -123,7 +123,7 @@ extern void mmc_free_host(struct mmc_host *);
 extern int mmc_suspend_host(struct mmc_host *, pm_message_t);
 extern int mmc_resume_host(struct mmc_host *);
 
-extern void mmc_detect_change(struct mmc_host *);
+extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
 extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
 
 #endif