[src/trunk]: src/sys/arch/arm/rockchip Fix rate calculation of fractional mod...

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

details:   https://anonhg.NetBSD.org/src/rev/31540e69ea7b
branches:  trunk
changeset: 319945:31540e69ea7b
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Jun 16 13:24:04 2018 +0000

description:
Fix rate calculation of fractional mode PLLs

diffstat:

 sys/arch/arm/rockchip/rk_cru_pll.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 1d64c188e1a9 -r 31540e69ea7b sys/arch/arm/rockchip/rk_cru_pll.c
--- a/sys/arch/arm/rockchip/rk_cru_pll.c        Sat Jun 16 13:09:41 2018 +0000
+++ b/sys/arch/arm/rockchip/rk_cru_pll.c        Sat Jun 16 13:24:04 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: rk_cru_pll.c,v 1.1 2018/06/16 00:19:04 jmcneill Exp $ */
+/* $NetBSD: rk_cru_pll.c,v 1.2 2018/06/16 13:24:04 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2018 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rk_cru_pll.c,v 1.1 2018/06/16 00:19:04 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rk_cru_pll.c,v 1.2 2018/06/16 13:24:04 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -96,7 +96,7 @@
                foutvco = fref / refdiv * fbdiv;
        } else {
                /* fractional mode */
-               foutvco = fref / refdiv * (fbdiv + fracdiv / 224);
+               foutvco = fref / refdiv * fbdiv + ((fref * fracdiv) >> 24);
        }
        foutpostdiv = foutvco / postdiv1 / postdiv2;