[src/trunk]: src/sys/dev/ic Calculate DDR3's tRAS correctly.

[msaitoh <msaitoh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3c6e4e22f400
branches:  trunk
changeset: 746199:3c6e4e22f400
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Tue Mar 24 03:47:39 2020 +0000

description:
Calculate DDR3's tRAS correctly.

diffstat:

 sys/dev/ic/spdmem.c |  9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diffs (30 lines):

diff -r dbb4bf05381d -r 3c6e4e22f400 sys/dev/ic/spdmem.c
--- a/sys/dev/ic/spdmem.c       Tue Mar 24 03:45:25 2020 +0000
+++ b/sys/dev/ic/spdmem.c       Tue Mar 24 03:47:39 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: spdmem.c,v 1.34 2020/03/24 03:45:25 msaitoh Exp $ */
+/* $NetBSD: spdmem.c,v 1.35 2020/03/24 03:47:39 msaitoh Exp $ */
 
 /*
  * Copyright (c) 2007 Nicolas Joly
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: spdmem.c,v 1.34 2020/03/24 03:45:25 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: spdmem.c,v 1.35 2020/03/24 03:47:39 msaitoh Exp $");
 
 #include <sys/param.h>
 #include <sys/device.h>
@@ -830,8 +830,9 @@
            __DDR3_CYCLES(__DDR3_VALUE_PICO(s, tAAmin)),
            __DDR3_CYCLES(__DDR3_VALUE_PICO(s, tRCDmin)),
            __DDR3_CYCLES(__DDR3_VALUE_PICO(s, tRPmin)),
-               (s->sm_ddr3.ddr3_tRAS_msb * 256 + s->sm_ddr3.ddr3_tRAS_lsb) /
-                   s->sm_ddr3.ddr3_tCKmin_mtb);
+           __DDR3_CYCLES((s->sm_ddr3.ddr3_tRAS_msb * 256
+               + s->sm_ddr3.ddr3_tRAS_lsb) * s->sm_ddr3.ddr3_mtb_dividend
+               / s->sm_ddr3.ddr3_mtb_divisor * 1000));
 
 #undef __DDR3_CYCLES