ARM: 6239/1: mmci: let core poll for card detection

Use the MMC core's ability to poll for card detection.  This also has
the advantage of doing the gpio_get_value from a workqueue instead of
timer, allowing the gpio to be on a sleeping gpiochip.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/mmc/host/mmci.c

@@ -567,18 +567,6 @@ static const struct mmc_host_ops mmci_ops = {
 	.get_cd		= mmci_get_cd,
 };
 
-static void mmci_check_status(unsigned long data)
-{
-	struct mmci_host *host = (struct mmci_host *)data;
-	unsigned int status = mmci_get_cd(host->mmc);
-
-	if (status ^ host->oldstat)
-		mmc_detect_change(host->mmc, 0);
-
-	host->oldstat = status;
-	mod_timer(&host->timer, jiffies + HZ);
-}
-
 static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 {
 	struct mmci_platform_data *plat = dev->dev.platform_data;
@@ -685,6 +673,7 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 	if (host->vcc == NULL)
 		mmc->ocr_avail = plat->ocr_mask;
 	mmc->caps = plat->capabilities;
+	mmc->caps |= MMC_CAP_NEEDS_POLL;
 
 	/*
 	 * We can do SGIO
@@ -750,20 +739,13 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
 
 	amba_set_drvdata(dev, mmc);
-	host->oldstat = mmci_get_cd(host->mmc);
 
 	mmc_add_host(mmc);
 
 	dev_info(&dev->dev, "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
 		mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
 		(unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
 
-	init_timer(&host->timer);
-	host->timer.data = (unsigned long)host;
-	host->timer.function = mmci_check_status;
-	host->timer.expires = jiffies + HZ;
-	add_timer(&host->timer);
-
 	return 0;
 
  irq0_free:
@@ -797,8 +779,6 @@ static int __devexit mmci_remove(struct amba_device *dev)
 	if (mmc) {
 		struct mmci_host *host = mmc_priv(mmc);
 
-		del_timer_sync(&host->timer);
-
 		mmc_remove_host(mmc);
 
 		writel(0, host->base + MMCIMASK0);