diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
index e992a7f8a16fc3019016aa1f2844cfbfb437ad97..2b32b88949ba40dfb3901cf9588f670b7aad8441 100644
--- a/drivers/mmc/core/sdio_bus.c
+++ b/drivers/mmc/core/sdio_bus.c
@@ -267,7 +267,7 @@ static void sdio_release_func(struct device *dev)
 	sdio_free_func_cis(func);
 
 	kfree(func->info);
-
+	kfree(func->tmpbuf);
 	kfree(func);
 }
 
@@ -282,6 +282,16 @@ struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 	if (!func)
 		return ERR_PTR(-ENOMEM);
 
+	/*
+	 * allocate buffer separately to make sure it's properly aligned for
+	 * DMA usage (incl. 64 bit DMA)
+	 */
+	func->tmpbuf = kmalloc(4, GFP_KERNEL);
+	if (!func->tmpbuf) {
+		kfree(func);
+		return ERR_PTR(-ENOMEM);
+	}
+
 	func->card = card;
 
 	device_initialize(&func->dev);
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index a9ac0b4573131f48cad46044e018b5de479cf695..8718432751c50c6d5a955b104c250b151430d19c 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -22,6 +22,7 @@
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/stat.h>
@@ -1621,10 +1622,16 @@ static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
 
 		if (card->type == MMC_TYPE_SDIO ||
 		    card->type == MMC_TYPE_SD_COMBO) {
-			set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
+			if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags)) {
+				pm_runtime_get_noresume(mmc->parent);
+				set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
+			}
 			clk_en_a = clk_en_a_old & ~clken_low_pwr;
 		} else {
-			clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
+			if (test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags)) {
+				pm_runtime_put_noidle(mmc->parent);
+				clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
+			}
 			clk_en_a = clk_en_a_old | clken_low_pwr;
 		}
 
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 7123ef96ed18523c88553146035103f3517bd372..445fc47dc3e77e39b17e7531eb7dbed58ddd3279 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -830,6 +830,7 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
 
 	switch (uhs) {
 	case MMC_TIMING_UHS_SDR50:
+	case MMC_TIMING_UHS_DDR50:
 		pinctrl = imx_data->pins_100mhz;
 		break;
 	case MMC_TIMING_UHS_SDR104:
diff --git a/include/linux/mmc/sdio_func.h b/include/linux/mmc/sdio_func.h
index aab032a6ae6124de63b7934f49d0dc564b0d2dc3..97ca105347a6c5e608297ae1a3562925dc6f6834 100644
--- a/include/linux/mmc/sdio_func.h
+++ b/include/linux/mmc/sdio_func.h
@@ -53,7 +53,7 @@ struct sdio_func {
 	unsigned int		state;		/* function state */
 #define SDIO_STATE_PRESENT	(1<<0)		/* present in sysfs */
 
-	u8			tmpbuf[4];	/* DMA:able scratch buffer */
+	u8			*tmpbuf;	/* DMA:able scratch buffer */
 
 	unsigned		num_info;	/* number of info strings */
 	const char		**info;		/* info strings */