From 4aa36fe574b32d9f4a75c9ec1e60d566c84ecc3b Mon Sep 17 00:00:00 2001
From: Jean Delvare <jdelvare@suse.de>
Date: Mon, 15 Apr 2013 14:28:55 +0000
Subject: [PATCH] DDR3: Round down PC3 numbers to comply with Jedec.

git-svn-id: http://lm-sensors.org/svn/i2c-tools/branches/i2c-tools-3.1@6154 7894878c-1315-0410-8ee3-d5d059ff63e0
---
 CHANGES             | 1 +
 eeprom/decode-dimms | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/CHANGES b/CHANGES
index 3feda87..0841c7d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -12,6 +12,7 @@ SVN HEAD
                 Decode more DDR3 module types
                 Fix DDR3 tRAS decoding
                 Fix DDR3 core timings rounding
+                Round down PC3 numbers to comply with Jedec
   i2cdetect: Clarify the SMBus commands used for probing by default
   i2c-dev.h: Minimize differences with kernel flavor
              Move SMBus helper functions to include/i2c/smbus.h
diff --git a/eeprom/decode-dimms b/eeprom/decode-dimms
index 8073843..9b5fe09 100755
--- a/eeprom/decode-dimms
+++ b/eeprom/decode-dimms
@@ -1197,6 +1197,8 @@ sub decode_ddr3_sdram($)
 	my $ddrclk = 2 * (1000 / $ctime);
 	my $tbits = 1 << (($bytes->[8] & 7) + 3);
 	my $pcclk = int ($ddrclk * $tbits / 8);
+	# Round down to comply with Jedec
+	$pcclk = $pcclk - ($pcclk % 100);
 	$ddrclk = int ($ddrclk);
 	printl("Maximum module speed", "$ddrclk MHz (PC3-${pcclk})");