From 94160a5e18830f7fffa4a7e80d92b9d3a58498b0 Mon Sep 17 00:00:00 2001
From: khali <khali@7894878c-1315-0410-8ee3-d5d059ff63e0>
Date: Sat, 13 Apr 2013 16:31:09 +0000
Subject: DDR3: Decode the FTB fields of tCk, tAA, tRCD, tRP and tRC.

git-svn-id: http://lm-sensors.org/svn/i2c-tools/trunk@6133 7894878c-1315-0410-8ee3-d5d059ff63e0
---
 CHANGES             |  1 +
 eeprom/decode-dimms | 25 ++++++++++++++++++-------
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/CHANGES b/CHANGES
index c8d0138..a9a0d16 100644
--- a/CHANGES
+++ b/CHANGES
@@ -28,6 +28,7 @@ SVN HEAD
                 Fix DDR3 core timings rounding
                 Round down PC3 numbers to comply with Jedec
                 Don't print the DDR3 time bases
+                Decode the FTB fields of DDR3 tCk, tAA, tRCD, tRP and tRC
   i2cdetect: Do a best effort detection if functionality is missing
              Clarify the SMBus commands used for probing by default
   i2c-dev.h: Minimize differences with kernel flavor
diff --git a/eeprom/decode-dimms b/eeprom/decode-dimms
index f2d1663..2b51bf9 100755
--- a/eeprom/decode-dimms
+++ b/eeprom/decode-dimms
@@ -1329,6 +1329,17 @@ sub decode_ddr2_sdram($)
 	printl_cond($bytes->[46], "PLL Relock Time", $bytes->[46] . " us");
 }
 
+# Return combined time in ns
+sub ddr3_mtb_ftb($$$$)
+{
+	my ($byte1, $byte2, $mtb, $ftb) = @_;
+
+	# byte1 is unsigned in ns, but byte2 is signed in ps
+	$byte2 -= 0x100 if $byte2 & 0x80;
+
+	return $byte1 * $mtb + $byte2 * $ftb / 1000;
+}
+
 # Parameter: EEPROM bytes 0-127 (using 3-76)
 sub decode_ddr3_sdram($)
 {
@@ -1358,7 +1369,7 @@ sub decode_ddr3_sdram($)
 # speed
 	prints("Memory Characteristics");
 
-	$ctime = $bytes->[12] * $mtb;
+	$ctime = ddr3_mtb_ftb($bytes->[12], $bytes->[34], $mtb, $ftb);
 	my $ddrclk = 2 * (1000 / $ctime);
 	my $tbits = 1 << (($bytes->[8] & 7) + 3);
 	my $pcclk = int ($ddrclk * $tbits / 8);
@@ -1392,12 +1403,12 @@ sub decode_ddr3_sdram($)
 	my $trp;
 	my $tras;
 
-	$taa  = ceil($bytes->[16] / $bytes->[12]);
-	$trcd = ceil($bytes->[18] / $bytes->[12]);
-	$trp  = ceil($bytes->[20] / $bytes->[12]);
-	$tras = ceil(((($bytes->[21] & 0x0f) << 8) + $bytes->[22]) / $bytes->[12]);
+	$taa  = ddr3_mtb_ftb($bytes->[16], $bytes->[35], $mtb, $ftb);
+	$trcd = ddr3_mtb_ftb($bytes->[18], $bytes->[36], $mtb, $ftb);
+	$trp  = ddr3_mtb_ftb($bytes->[20], $bytes->[37], $mtb, $ftb);
+	$tras = ((($bytes->[21] & 0x0f) << 8) + $bytes->[22]) * $mtb;
 
-	printl("tCL-tRCD-tRP-tRAS", join("-", $taa, $trcd, $trp, $tras));
+	printl("tCL-tRCD-tRP-tRAS", ddr_core_timings(ceil($taa / $ctime), $ctime, $trcd, $trp, $tras));
 
 # latencies
 	my $highestCAS = 0;
@@ -1419,7 +1430,7 @@ sub decode_ddr3_sdram($)
 	printl("Minimum Row Active to Row Active Delay (tRRD)",
 		tns3($bytes->[19] * $mtb));
 	printl("Minimum Active to Auto-Refresh Delay (tRC)",
-		tns3((((($bytes->[21] >> 4) & 15) << 8) + $bytes->[23]) * $mtb));
+		tns3(ddr3_mtb_ftb((($bytes->[21] & 0xf0) << 4) + $bytes->[23], $bytes->[38], $mtb, $ftb)));
 	printl("Minimum Recovery Delay (tRFC)",
 		tns3((($bytes->[25] << 8) + $bytes->[24]) * $mtb));
 	printl("Minimum Write to Read CMD Delay (tWTR)",
-- 
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