diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
index d659c59422e1..a3798c9912f6 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -149,10 +149,17 @@ struct sdhci_am654_data {
 	int strb_sel;
 	u32 flags;
 	u32 quirks;
+	bool dll_enable;
 
 #define SDHCI_AM654_QUIRK_FORCE_CDTEST BIT(0)
 };
 
+struct window {
+	u8 start;
+	u8 end;
+	u8 length;
+};
+
 struct sdhci_am654_driver_data {
 	const struct sdhci_pltfm_data *pdata;
 	u32 flags;
@@ -290,10 +297,13 @@ static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
 
 	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);
 
-	if (timing > MMC_TIMING_UHS_SDR25 && clock >= CLOCK_TOO_SLOW_HZ)
+	if (timing > MMC_TIMING_UHS_SDR25 && clock >= CLOCK_TOO_SLOW_HZ) {
 		sdhci_am654_setup_dll(host, clock);
-	else
+		sdhci_am654->dll_enable = true;
+	} else {
 		sdhci_am654_setup_delay_chain(sdhci_am654, timing);
+		sdhci_am654->dll_enable = false;
+	}
 
 	regmap_update_bits(sdhci_am654->base, PHY_CTRL5, CLKBUFSEL_MASK,
 			   sdhci_am654->clkbuf_sel);
@@ -408,39 +418,117 @@ static u32 sdhci_am654_cqhci_irq(struct sdhci_host *host, u32 intmask)
 	return 0;
 }
 
-#define ITAP_MAX	32
+#define ITAPDLY_LENGTH 32
+#define ITAPDLY_LAST_INDEX 31
+static u32 sdhci_am654_calculate_itap(struct sdhci_host *host, struct window
+			  *fail_window, u8 num_fails, bool circular_buffer)
+{
+	struct device *dev = mmc_dev(host->mmc);
+	struct window pass_window, first_fail, last_fail;
+	u8 itap = 0, start_fail = 0, end_fail = 0, pass_length = 0;
+	int prev_end_fail = -1;
+	u8 i;
+
+	memset(&pass_window, 0, sizeof(pass_window));
+	memset(&first_fail, 0, sizeof(first_fail));
+	memset(&last_fail, 0, sizeof(last_fail));
+
+	if (!num_fails) {
+		itap = ITAPDLY_LAST_INDEX >> 1;
+	} else if (fail_window->length == ITAPDLY_LENGTH) {
+		dev_err(dev, "No passing ITAPDLY, return 0\n");
+		itap = 0;
+	} else {
+		for (i = 0; i < num_fails; i++) {
+			start_fail = fail_window[i].start;
+			end_fail = fail_window[i].end;
+
+			if (i == 0) {
+				first_fail.start = start_fail;
+				first_fail.end = end_fail;
+				first_fail.length = fail_window[0].length;
+			}
+
+			if (i == num_fails - 1) {
+				last_fail.start = start_fail;
+				last_fail.end = end_fail;
+				last_fail.length = fail_window[i].length;
+			}
+
+			pass_length = start_fail - (prev_end_fail + 1);
+			if (pass_length > pass_window.length) {
+				pass_window.start = prev_end_fail + 1;
+				pass_window.length = pass_length;
+			}
+			prev_end_fail = end_fail;
+		}
+
+		if (!circular_buffer) {
+			if (ITAPDLY_LAST_INDEX - end_fail > pass_window.length) {
+				pass_window.start = end_fail + 1;
+				pass_window.length = ITAPDLY_LAST_INDEX - end_fail;
+			}
+		} else {
+			pass_length = ITAPDLY_LAST_INDEX - end_fail + first_fail.start;
+			if (pass_length > pass_window.length) {
+				pass_window.start = last_fail.end + 1;
+				pass_window.length = pass_length;
+			}
+		}
+
+		if (!circular_buffer)
+			itap = pass_window.start + (pass_window.length >> 1);
+		else
+			itap = (pass_window.start + (pass_window.length >> 1)) % ITAPDLY_LENGTH;
+
+		if (itap < 0 || itap > ITAPDLY_LAST_INDEX)
+			itap = 0;
+	}
+
+	return itap;
+}
+
 static int sdhci_am654_platform_execute_tuning(struct sdhci_host *host,
 					       u32 opcode)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
-	int cur_val, prev_val = 1, fail_len = 0, pass_window = 0, pass_len;
-	u32 itap;
+	struct window fail_window[ITAPDLY_LENGTH];
+	u8 prev_pass = 1;
+	u8 fail_index = 0;
+	u8 curr_pass, itap;
+
+	memset(fail_window, 0, sizeof(fail_window[0]) * ITAPDLY_LENGTH);
 
 	/* Enable ITAPDLY */
 	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPDLYENA_MASK,
 			   1 << ITAPDLYENA_SHIFT);
 
-	for (itap = 0; itap < ITAP_MAX; itap++) {
+	for (itap = 0; itap < ITAPDLY_LENGTH; itap++) {
 		sdhci_am654_write_itapdly(sdhci_am654, itap);
 
-		cur_val = !mmc_send_tuning(host->mmc, opcode, NULL);
-		if (cur_val && !prev_val)
-			pass_window = itap;
+		curr_pass = !mmc_send_tuning(host->mmc, opcode, NULL);
 
-		if (!cur_val)
-			fail_len++;
+		if (!curr_pass && prev_pass)
+			fail_window[fail_index].start = itap;
 
-		prev_val = cur_val;
+		if (!curr_pass) {
+			fail_window[fail_index].end = itap;
+			fail_window[fail_index].length++;
+		}
+
+		if (curr_pass && !prev_pass)
+			fail_index++;
+
+		prev_pass = curr_pass;
 	}
-	/*
-	 * Having determined the length of the failing window and start of
-	 * the passing window calculate the length of the passing window and
-	 * set the final value halfway through it considering the range as a
-	 * circular buffer
-	 */
-	pass_len = ITAP_MAX - fail_len;
-	itap = (pass_window + (pass_len >> 1)) % ITAP_MAX;
+
+	if (fail_window[fail_index].length != 0)
+		fail_index++;
+
+	itap = sdhci_am654_calculate_itap(host, fail_window, fail_index,
+					  (sdhci_am654->dll_enable ? true : false));
+
 	sdhci_am654_write_itapdly(sdhci_am654, itap);
 
 	return 0;
