mmc: sdio: Add high speed support to sdio_reset_comm()

Signed-off-by: San Mehat <san@google.com>

drivers/mmc/core/sdio.c

@@ -527,7 +527,28 @@ int sdio_reset_comm(struct mmc_card *card)
 			goto err;
 	}
 
-	mmc_set_clock(host, card->cis.max_dtr);
+	/*
+	 * Switch to high-speed (if supported).
+	 */
+	err = sdio_enable_hs(card);
+	if (err)
+		goto err;
+
+	/*
+	 * Change to the card's maximum speed.
+	 */
+	if (mmc_card_highspeed(card)) {
+		/*
+		 * The SDIO specification doesn't mention how
+		 * the CIS transfer speed register relates to
+		 * high-speed, but it seems that 50 MHz is
+		 * mandatory.
+		 */
+		mmc_set_clock(host, 50000000);
+	} else {
+		mmc_set_clock(host, card->cis.max_dtr);
+	}
+
 	err = sdio_enable_wide(card);
 	if (err)
 		goto err;