diff --git a/src/mainboard/google/reef/devicetree.cb b/src/mainboard/google/reef/devicetree.cb
index 9775dc80c8..e626a4c727 100644
--- a/src/mainboard/google/reef/devicetree.cb
+++ b/src/mainboard/google/reef/devicetree.cb
@@ -12,24 +12,24 @@ chip soc/intel/apollolake
 	register "emmc_tx_data_cntl1" = "0x0C11" # HS400 required
 
 	# EMMC TX DATA Delay 2#
-	# 0x1C[30:24] stands for 28*125 = 3500 pSec delay for SDR50
-	# 0x1C[22:16] stands for 28*125 = 3500 pSec delay for DDR50
-	# 0x1C[14:8] stands for 28*125 = 3500 pSec delay for SDR25/HS50
-	# 0x00[6:0] stands for 0 delay for SDR12/Compatibility mode
-	register "emmc_tx_data_cntl2" = "0x1c1c1c00"
+	# 0x00[30:24] stands for 0*125 = no delay for SDR50
+	# 0x2B[22:16] stands for 43*125 = 5375 pSec delay for DDR50
+	# 0x29[14:8] stands for 41*125 = 5125 pSec delay for SDR25/HS50
+	# 0x29[6:0] stands for 41*125 = 5125 pSec delay for SDR12
+	register "emmc_tx_data_cntl2" = "0x002B2929"
 
 	# EMMC RX CMD/DATA Delay 1#
-	# 0x1C[30:24] stands for 28*125 = 3500 pSec delay for SDR50
-	# 0x1C[22:16] stands for 28*125 = 3500 pSec delay for DDR50
-	# 0x1C[14:8] stands for 28*125 = 3500 pSec delay for SDR25/HS50
-	# 0x00[6:0] stands for 0 delay for SDR12/Compatibility
-	register "emmc_rx_cmd_data_cntl1" = "0x1c1c1c00"
+	# 0x00[30:24] stands for 0*125 = no delay for SDR50
+	# 0x12[22:16] stands for 18*125 = 2250 pSec delay for DDR50
+	# 0x57[14:8] stands for 87*125 = 10875 pSec delay for SDR25/HS50
+	# 0x3B[6:0] stands for 59*125= 7375 pSec delay for SDR12
+	register "emmc_rx_cmd_data_cntl1" = "0x0012573B"
 
 	# EMMC RX CMD/DATA Delay 2#
 	# 0x01[17:16] stands for Rx Clock before Output Buffer
 	# 0x00[14:8] stands for 0 delay for Auto Tuning Mode
-	# 0x1C[6:0] stands for 28*125 =  3500 pSec delay for SDR104/HS200
-	register "emmc_rx_cmd_data_cntl2" = "0x1001c"
+	# 0x1C[6:0] stands for 28*125 =  3500 pSec delay for HS200
+	register "emmc_rx_cmd_data_cntl2" = "0x1001C"
 
 	device domain 0 on
 		device pci 00.0 on  end	# - Host Bridge