mmc: extend the slot-gpio card-detection to use host's .card_event() method

The slot-gpio API provides a generic card-detection handler. To support a
wider range of hosts it has to call the host's card-event callback, if
implemented. Also increase the debounce interval to 200ms to match the
SDHCI driver.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/core/slot-gpio.c

@@ -27,7 +27,13 @@ struct mmc_gpio {
 static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
 {
 	/* Schedule a card detection after a debounce timeout */
-	mmc_detect_change(dev_id, msecs_to_jiffies(100));
+	struct mmc_host *host = dev_id;
+
+	if (host->ops->card_event)
+		host->ops->card_event(host);
+
+	mmc_detect_change(host, msecs_to_jiffies(200));
+
 	return IRQ_HANDLED;
 }