diff --git a/include/hw/sd/allwinner-sdhost.h b/include/hw/sd/allwinner-sdhost.h
index 30c1e604041..1b951177dda 100644
--- a/include/hw/sd/allwinner-sdhost.h
+++ b/include/hw/sd/allwinner-sdhost.h
@@ -38,6 +38,12 @@
 /** Allwinner sun5i family and newer (A13, H2+, H3, etc) */
 #define TYPE_AW_SDHOST_SUN5I TYPE_AW_SDHOST "-sun5i"
 
+/** Allwinner sun50i-a64 */
+#define TYPE_AW_SDHOST_SUN50I_A64 TYPE_AW_SDHOST "-sun50i-a64"
+
+/** Allwinner sun50i-a64 emmc */
+#define TYPE_AW_SDHOST_SUN50I_A64_EMMC  TYPE_AW_SDHOST "-sun50i-a64-emmc"
+
 /** @} */
 
 /**
@@ -110,6 +116,7 @@ struct AwSdHostState {
     uint32_t startbit_detect;   /**< eMMC DDR Start Bit Detection Control */
     uint32_t response_crc;      /**< Response CRC */
     uint32_t data_crc[8];       /**< Data CRC */
+    uint32_t sample_delay;      /**< Sample delay control */
     uint32_t status_crc;        /**< Status CRC */
 
     /** @} */
@@ -132,6 +139,8 @@ struct AwSdHostClass {
     size_t max_desc_size;
     bool   is_sun4i;
 
+    /** does the IP block support autocalibration? */
+    bool can_calibrate;
 };
 
 #endif /* HW_SD_ALLWINNER_SDHOST_H */
diff --git a/hw/arm/allwinner-r40.c b/hw/arm/allwinner-r40.c
index 0e4542d35f2..b148c564498 100644
--- a/hw/arm/allwinner-r40.c
+++ b/hw/arm/allwinner-r40.c
@@ -271,7 +271,7 @@ static void allwinner_r40_init(Object *obj)
 
     for (int i = 0; i < AW_R40_NUM_MMCS; i++) {
         object_initialize_child(obj, mmc_names[i], &s->mmc[i],
-                                TYPE_AW_SDHOST_SUN5I);
+                                TYPE_AW_SDHOST_SUN50I_A64);
     }
 
     object_initialize_child(obj, "twi0", &s->i2c0, TYPE_AW_I2C_SUN6I);
diff --git a/hw/sd/allwinner-sdhost.c b/hw/sd/allwinner-sdhost.c
index 92a0f42708d..286e0095098 100644
--- a/hw/sd/allwinner-sdhost.c
+++ b/hw/sd/allwinner-sdhost.c
@@ -77,6 +77,7 @@ enum {
     REG_SD_DATA1_CRC  = 0x12C, /* CRC Data 1 from card/eMMC */
     REG_SD_DATA0_CRC  = 0x130, /* CRC Data 0 from card/eMMC */
     REG_SD_CRC_STA    = 0x134, /* CRC status from card/eMMC during write */
+    REG_SD_SAMP_DL    = 0x144, /* Sample Delay Control (sun50i-a64) */
     REG_SD_FIFO       = 0x200, /* Read/Write FIFO */
 };
 
@@ -158,6 +159,7 @@ enum {
     REG_SD_RES_CRC_RST      = 0x0,
     REG_SD_DATA_CRC_RST     = 0x0,
     REG_SD_CRC_STA_RST      = 0x0,
+    REG_SD_SAMPLE_DL_RST    = 0x00002000,
     REG_SD_FIFO_RST         = 0x0,
 };
 
@@ -459,6 +461,7 @@ static uint64_t allwinner_sdhost_read(void *opaque, hwaddr offset,
 {
     AwSdHostState *s = AW_SDHOST(opaque);
     AwSdHostClass *sc = AW_SDHOST_GET_CLASS(s);
+    bool out_of_bounds = false;
     uint32_t res = 0;
 
     switch (offset) {
@@ -577,13 +580,24 @@ static uint64_t allwinner_sdhost_read(void *opaque, hwaddr offset,
     case REG_SD_FIFO:      /* Read/Write FIFO */
         res = allwinner_sdhost_fifo_read(s);
         break;
+    case REG_SD_SAMP_DL: /* Sample Delay */
+        if (sc->can_calibrate) {
+            res = s->sample_delay;
+        } else {
+            out_of_bounds = true;
+        }
+        break;
     default:
-        qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset %"
-                      HWADDR_PRIx"\n", __func__, offset);
+        out_of_bounds = true;
         res = 0;
         break;
     }
 
+    if (out_of_bounds) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset %"
+                      HWADDR_PRIx"\n", __func__, offset);
+    }
+
     trace_allwinner_sdhost_read(offset, res, size);
     return res;
 }
@@ -602,6 +616,7 @@ static void allwinner_sdhost_write(void *opaque, hwaddr offset,
 {
     AwSdHostState *s = AW_SDHOST(opaque);
     AwSdHostClass *sc = AW_SDHOST_GET_CLASS(s);
+    bool out_of_bounds = false;
 
     trace_allwinner_sdhost_write(offset, value, size);
 
@@ -725,10 +740,21 @@ static void allwinner_sdhost_write(void *opaque, hwaddr offset,
     case REG_SD_DATA0_CRC: /* CRC Data 0 from card/eMMC */
     case REG_SD_CRC_STA:   /* CRC status from card/eMMC in write operation */
         break;
+    case REG_SD_SAMP_DL: /* Sample delay control */
+        if (sc->can_calibrate) {
+            s->sample_delay = value;
+        } else {
+            out_of_bounds = true;
+        }
+        break;
     default:
+        out_of_bounds = true;
+        break;
+    }
+
+    if (out_of_bounds) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset %"
                       HWADDR_PRIx"\n", __func__, offset);
-        break;
     }
 }
 
@@ -777,6 +803,7 @@ static const VMStateDescription vmstate_allwinner_sdhost = {
         VMSTATE_UINT32(response_crc, AwSdHostState),
         VMSTATE_UINT32_ARRAY(data_crc, AwSdHostState, 8),
         VMSTATE_UINT32(status_crc, AwSdHostState),
+        VMSTATE_UINT32(sample_delay, AwSdHostState),
         VMSTATE_END_OF_LIST()
     }
 };
@@ -815,6 +842,7 @@ static void allwinner_sdhost_realize(DeviceState *dev, Error **errp)
 static void allwinner_sdhost_reset(DeviceState *dev)
 {
     AwSdHostState *s = AW_SDHOST(dev);
+    AwSdHostClass *sc = AW_SDHOST_GET_CLASS(s);
 
     s->global_ctl = REG_SD_GCTL_RST;
     s->clock_ctl = REG_SD_CKCR_RST;
@@ -855,6 +883,10 @@ static void allwinner_sdhost_reset(DeviceState *dev)
     }
 
     s->status_crc = REG_SD_CRC_STA_RST;
+
+    if (sc->can_calibrate) {
+        s->sample_delay = REG_SD_SAMPLE_DL_RST;
+    }
 }
 
 static void allwinner_sdhost_bus_class_init(ObjectClass *klass, void *data)
@@ -879,6 +911,7 @@ static void allwinner_sdhost_sun4i_class_init(ObjectClass *klass, void *data)
     AwSdHostClass *sc = AW_SDHOST_CLASS(klass);
     sc->max_desc_size = 8 * KiB;
     sc->is_sun4i = true;
+    sc->can_calibrate = false;
 }
 
 static void allwinner_sdhost_sun5i_class_init(ObjectClass *klass, void *data)
@@ -886,6 +919,25 @@ static void allwinner_sdhost_sun5i_class_init(ObjectClass *klass, void *data)
     AwSdHostClass *sc = AW_SDHOST_CLASS(klass);
     sc->max_desc_size = 64 * KiB;
     sc->is_sun4i = false;
+    sc->can_calibrate = false;
+}
+
+static void allwinner_sdhost_sun50i_a64_class_init(ObjectClass *klass,
+                                                   void *data)
+{
+    AwSdHostClass *sc = AW_SDHOST_CLASS(klass);
+    sc->max_desc_size = 64 * KiB;
+    sc->is_sun4i = false;
+    sc->can_calibrate = true;
+}
+
+static void allwinner_sdhost_sun50i_a64_emmc_class_init(ObjectClass *klass,
+                                                        void *data)
+{
+    AwSdHostClass *sc = AW_SDHOST_CLASS(klass);
+    sc->max_desc_size = 8 * KiB;
+    sc->is_sun4i = false;
+    sc->can_calibrate = true;
 }
 
 static const TypeInfo allwinner_sdhost_info = {
@@ -910,6 +962,18 @@ static const TypeInfo allwinner_sdhost_sun5i_info = {
     .class_init    = allwinner_sdhost_sun5i_class_init,
 };
 
+static const TypeInfo allwinner_sdhost_sun50i_a64_info = {
+    .name          = TYPE_AW_SDHOST_SUN50I_A64,
+    .parent        = TYPE_AW_SDHOST,
+    .class_init    = allwinner_sdhost_sun50i_a64_class_init,
+};
+
+static const TypeInfo allwinner_sdhost_sun50i_a64_emmc_info = {
+    .name          = TYPE_AW_SDHOST_SUN50I_A64_EMMC,
+    .parent        = TYPE_AW_SDHOST,
+    .class_init    = allwinner_sdhost_sun50i_a64_emmc_class_init,
+};
+
 static const TypeInfo allwinner_sdhost_bus_info = {
     .name = TYPE_AW_SDHOST_BUS,
     .parent = TYPE_SD_BUS,
@@ -922,6 +986,8 @@ static void allwinner_sdhost_register_types(void)
     type_register_static(&allwinner_sdhost_info);
     type_register_static(&allwinner_sdhost_sun4i_info);
     type_register_static(&allwinner_sdhost_sun5i_info);
+    type_register_static(&allwinner_sdhost_sun50i_a64_info);
+    type_register_static(&allwinner_sdhost_sun50i_a64_emmc_info);
     type_register_static(&allwinner_sdhost_bus_info);
 }
 
