diff --git a/sys/arm/amlogic/aml8726/aml8726_mmc.c b/sys/arm/amlogic/aml8726/aml8726_mmc.c
index beaf2cb0d74b..1a9c8afae4c7 100644
--- a/sys/arm/amlogic/aml8726/aml8726_mmc.c
+++ b/sys/arm/amlogic/aml8726/aml8726_mmc.c
@@ -965,15 +965,26 @@ aml8726_mmc_read_ivar(device_t bus, device_t child,
 	case MMCBR_IVAR_POWER_MODE:
 		*(int *)result = sc->host.ios.power_mode;
 		break;
+	case MMCBR_IVAR_RETUNE_REQ:
+		*(int *)result = return_req_none;
 	case MMCBR_IVAR_VDD:
 		*(int *)result = sc->host.ios.vdd;
 		break;
+	case MMCBR_IVAR_VCCQ:
+		*result = sc->sc_host.ios.vccq;
+		break;
 	case MMCBR_IVAR_CAPS:
 		*(int *)result = sc->host.caps;
 		break;
+	case MMCBR_IVAR_TIMING:
+		*(int *)result = sc->sc_host.ios.timing;
+		break;
 	case MMCBR_IVAR_MAX_DATA:
 		*(int *)result = AML_MMC_MAX_DMA / MMC_SECTOR_SIZE;
 		break;
+	case MMCBR_IVAR_MAX_BUSY_TIMEOUT:
+		*(int *)result = 1000000;	/* 1s max */
+		break;
 	default:
 		return (EINVAL);
 	}
@@ -1012,6 +1023,12 @@ aml8726_mmc_write_ivar(device_t bus, device_t child,
 	case MMCBR_IVAR_VDD:
 		sc->host.ios.vdd = value;
 		break;
+	case MMCBR_IVAR_VCCQ:
+		sc->sc_host.ios.vccq = value;
+		break;
+	case MMCBR_IVAR_TIMING:
+		sc->sc_host.ios.timing = value;
+		break;
 	/* These are read-only */
 	case MMCBR_IVAR_CAPS:
 	case MMCBR_IVAR_HOST_OCR:
diff --git a/sys/arm/amlogic/aml8726/aml8726_sdxc-m8.c b/sys/arm/amlogic/aml8726/aml8726_sdxc-m8.c
index fccc5cd393ad..7874edfb4eb7 100644
--- a/sys/arm/amlogic/aml8726/aml8726_sdxc-m8.c
+++ b/sys/arm/amlogic/aml8726/aml8726_sdxc-m8.c
@@ -1245,15 +1245,27 @@ aml8726_sdxc_read_ivar(device_t bus, device_t child,
 	case MMCBR_IVAR_POWER_MODE:
 		*(int *)result = sc->host.ios.power_mode;
 		break;
+	case MMCBR_IVAR_RETUNE_REQ:
+		*(int *)result = return_req_none;
+		break;
 	case MMCBR_IVAR_VDD:
 		*(int *)result = sc->host.ios.vdd;
 		break;
+	case MMCBR_IVAR_VCCQ:
+		*result = sc->host.ios.vccq;
+		break;
 	case MMCBR_IVAR_CAPS:
 		*(int *)result = sc->host.caps;
 		break;
+	case MMCBR_IVAR_TIMING:
+		*(int *)result = sc->host.ios.timing;
+		break;
 	case MMCBR_IVAR_MAX_DATA:
 		*(int *)result = AML_SDXC_MAX_DMA / MMC_SECTOR_SIZE;
 		break;
+	case MMCBR_IVAR_MAX_BUSY_TIMEOUT:
+		*(int *)result = 1000000;	/* 1s max */
+		break;
 	default:
 		return (EINVAL);
 	}
@@ -1292,6 +1304,12 @@ aml8726_sdxc_write_ivar(device_t bus, device_t child,
 	case MMCBR_IVAR_VDD:
 		sc->host.ios.vdd = value;
 		break;
+	case MMCBR_IVAR_VCCQ:
+		sc->host.ios.vccq = value;
+		break;
+	case MMCBR_IVAR_TIMING:
+		sc->host.ios.timing = value;
+		break;
 	/* These are read-only */
 	case MMCBR_IVAR_CAPS:
 	case MMCBR_IVAR_HOST_OCR:
diff --git a/sys/dev/mmc/host/dwmmc.c b/sys/dev/mmc/host/dwmmc.c
index 29e6da8e58f0..4e0686ac158b 100644
--- a/sys/dev/mmc/host/dwmmc.c
+++ b/sys/dev/mmc/host/dwmmc.c
@@ -1091,6 +1091,9 @@ dwmmc_read_ivar(device_t bus, device_t child, int which, uintptr_t *result)
 	case MMCBR_IVAR_VDD:
 		*(int *)result = sc->host.ios.vdd;
 		break;
+	case MMCBR_IVAR_VCCQ:
+		*(int *)result = sc->host.ios.vccq;
+		break;
 	case MMCBR_IVAR_CAPS:
 		*(int *)result = sc->host.caps;
 		break;
@@ -1141,10 +1144,8 @@ dwmmc_write_ivar(device_t bus, device_t child, int which, uintptr_t value)
 	case MMCBR_IVAR_TIMING:
 		sc->host.ios.timing = value;
 		break;
-
-	/* Not handled */
 	case MMCBR_IVAR_VCCQ:
-		return (0);
+		sc->sc_host.ios.vccq = value;
 		break;
 	/* These are read-only */
 	case MMCBR_IVAR_CAPS:
diff --git a/sys/mips/ingenic/jz4780_mmc.c b/sys/mips/ingenic/jz4780_mmc.c
index 6d7e721c11cb..ed7e14fc0fab 100644
--- a/sys/mips/ingenic/jz4780_mmc.c
+++ b/sys/mips/ingenic/jz4780_mmc.c
@@ -774,17 +774,26 @@ jz4780_mmc_read_ivar(device_t bus, device_t child, int which,
 	case MMCBR_IVAR_POWER_MODE:
 		*(int *)result = sc->sc_host.ios.power_mode;
 		break;
+	case MMCBR_IVAR_RETUNE_REQ:
+		*(int *)result = return_req_none;
+		break;
 	case MMCBR_IVAR_VDD:
 		*(int *)result = sc->sc_host.ios.vdd;
 		break;
+	case MMCBR_IVAR_VCCQ:
+		*result = sc->sc_host.ios.vccq;
+		break;
 	case MMCBR_IVAR_CAPS:
 		*(int *)result = sc->sc_host.caps;
 		break;
+	case MMCBR_IVAR_TIMING:
+		*(int *)result = sc->sc_host.ios.timing;
+		break;
 	case MMCBR_IVAR_MAX_DATA:
 		*(int *)result = 65535;
 		break;
-	case MMCBR_IVAR_TIMING:
-		*(int *)result = sc->sc_host.ios.timing;
+	case MMCBR_IVAR_MAX_BUSY_TIMEOUT:
+		*(int *)result = 1000000;	/* 1s max */
 		break;
 	}
 
@@ -825,6 +834,9 @@ jz4780_mmc_write_ivar(device_t bus, device_t child, int which,
 	case MMCBR_IVAR_VDD:
 		sc->sc_host.ios.vdd = value;
 		break;
+	case MMCBR_IVAR_VCCQ:
+		sc->sc_host.ios.vccq = value;
+		break;
 	case MMCBR_IVAR_TIMING:
 		sc->sc_host.ios.timing = value;
 		break;