mmc: fsl_esdhc: enable EVDD automatic control for SD/MMC Legacy Adapter Card

When detecting SDHC Adapter Card Type 2(SD/MMC Legacy Adapter Card),
enable EVDD automatic control via SDHC_VS. This could support SD card
IO voltage switching for UHS-1 speed mode.

Signed-off-by: Yangbo Lu <yangbo.lu@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

board/freescale/common/qixis.h

@@ -125,10 +125,13 @@ void qixis_write_i2c(unsigned int reg, u8 value);
 #define QIXIS_ESDHC_ADAPTER_TYPE_MMC            0x5	/* MMC Card */
 #define QIXIS_ESDHC_ADAPTER_TYPE_SD             0x6	/* SD Card Rev2.0 3.0 */
 #define QIXIS_ESDHC_NO_ADAPTER                  0x7	/* No Card is Present*/
+
 #define QIXIS_SDCLKIN		0x08
 #define QIXIS_SDCLKOUT		0x02
 #define QIXIS_DAT5_6_7		0X02
 #define QIXIS_DAT4		0X01
+
+#define QIXIS_EVDD_BY_SDHC_VS	0x0c
 #endif
 
 #endif

drivers/mmc/fsl_esdhc.c

@@ -753,6 +753,9 @@ void mmc_adapter_card_type_ident(void)
 		QIXIS_WRITE(brdcfg[5], value);
 		break;
 	case QIXIS_ESDHC_ADAPTER_TYPE_SDMMC_LEGACY:
+		value = QIXIS_READ(pwr_ctl[1]);
+		value |= QIXIS_EVDD_BY_SDHC_VS;
+		QIXIS_WRITE(pwr_ctl[1], value);
 		break;
 	case QIXIS_ESDHC_ADAPTER_TYPE_EMMC44:
 		value = QIXIS_READ(brdcfg[5]);