mmc: dw_mmc: control the power-enable register

When card is power-on/off, need to control the power-enable register.
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: NJames Hogan <james.hogan@imgtec.com>
Acked-by: NSeungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

drivers/mmc/host/dw_mmc.c

@@ -821,11 +821,17 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		/* Power up slot */
 		if (slot->host->pdata->setpower)
 			slot->host->pdata->setpower(slot->id, mmc->ocr_avail);
+		regs = mci_readl(slot->host, PWREN);
+		regs |= (1 << slot->id);
+		mci_writel(slot->host, PWREN, regs);
 		break;
 	case MMC_POWER_OFF:
 		/* Power down slot */
 		if (slot->host->pdata->setpower)
 			slot->host->pdata->setpower(slot->id, 0);
+		regs = mci_readl(slot->host, PWREN);
+		regs &= ~(1 << slot->id);
+		mci_writel(slot->host, PWREN, regs);
 		break;
 	default:
 		break;