[src/trunk]: src/sys/arch/arm/nvidia make VDD_CPU programming a bit easier to...

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

details:   https://anonhg.NetBSD.org/src/rev/331b1a91f2b6
branches:  trunk
changeset: 811699:331b1a91f2b6
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Wed Nov 11 12:49:10 2015 +0000

description:
make VDD_CPU programming a bit easier to understand, and while here, actually program it to 1.4V as intended instead of 1.39V

diffstat:

 sys/arch/arm/nvidia/soc_tegra124.c |  11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diffs (33 lines):

diff -r 0280d433b95d -r 331b1a91f2b6 sys/arch/arm/nvidia/soc_tegra124.c
--- a/sys/arch/arm/nvidia/soc_tegra124.c        Wed Nov 11 12:37:52 2015 +0000
+++ b/sys/arch/arm/nvidia/soc_tegra124.c        Wed Nov 11 12:49:10 2015 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: soc_tegra124.c,v 1.6 2015/06/03 11:43:18 skrll Exp $ */
+/* $NetBSD: soc_tegra124.c,v 1.7 2015/11/11 12:49:10 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -30,7 +30,7 @@
 #include "opt_multiprocessor.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: soc_tegra124.c,v 1.6 2015/06/03 11:43:18 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: soc_tegra124.c,v 1.7 2015/11/11 12:49:10 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -77,9 +77,12 @@
 void
 tegra124_cpuinit(void)
 {
+       tegra_car_periph_i2c_enable(4, 204000000);
+
        /* Set VDD_CPU voltage to 1.4V */
-       tegra_car_periph_i2c_enable(4, 204000000);
-       tegra_i2c_dvc_write(0x40, 0x4f00, 2);
+       const u_int target_mv = 1400;
+       const u_int sd0_vsel = (target_mv - 600) / 10;
+       tegra_i2c_dvc_write(0x40, (sd0_vsel << 8) | 00, 2);
        delay(10000);
 
        tegra_cpufreq_register(&tegra124_cpufreq_func);