mmc: dw_mmc: add the debug message for polling and non-removable

If card is polling or non-removable, display the more exact message.
It's helpful to debug which detecting scheme is using.

Signed-off-by: Jaehoon Chung <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/dw_mmc.c

···
 	int gpio_cd = mmc_gpio_get_cd(mmc);
 
 	/* Use platform get_cd function, else try onboard card detect */
-	if ((mmc->caps & MMC_CAP_NEEDS_POLL) || !mmc_card_is_removable(mmc))
+	if (((mmc->caps & MMC_CAP_NEEDS_POLL)
+				|| !mmc_card_is_removable(mmc))) {
 		present = 1;
-	else if (gpio_cd >= 0)
+
+		if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
+			if (mmc->caps & MMC_CAP_NEEDS_POLL) {
+				dev_info(&mmc->class_dev,
+					"card is polling.\n");
+			} else {
+				dev_info(&mmc->class_dev,
+					"card is non-removable.\n");
+			}
+			set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
+		}
+
+		return present;
+	} else if (gpio_cd >= 0)
 		present = gpio_cd;
 	else
 		present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))