MINIARM: HACK: mmc: dw_mmc-rockchip: enable vmmc supply for reboot

Mmc core has already power off the vmmc since shutdown, re-enable it so
that card is active in next reboot.

Change-Id: Id64ed02844db9d834c820ed5b8c5bf7a0afe4ed5
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>

Author: Ziyuan Xu

drivers/mmc/host/dw_mmc-rockchip.c

@@ -15,6 +15,7 @@
 #include <linux/of_address.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
 
 #include "dw_mmc.h"
 #include "dw_mmc-pltfm.h"
@@ -290,6 +291,12 @@ static void dw_mci_rockchip_platfm_shutdown(struct platform_device *pdev)
 {
 	struct dw_mci *host = platform_get_drvdata(pdev);
 	struct mmc_host *mmc = host->cur_slot->mmc;
+	int ret;
+
+	mdelay(20);
+
+	if (!IS_ERR(mmc->supply.vmmc))
+		ret = regulator_enable(mmc->supply.vmmc);
 
 	if (!IS_ERR(mmc->supply.vqmmc))
 		regulator_set_voltage(mmc->supply.vqmmc, 3000000, 3300000);