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

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This commit is contained in:
jmcneill 2015-11-11 12:49:10 +00:00
parent 578cf4f763
commit 317868fba7
1 changed files with 7 additions and 4 deletions
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11
sys/arch/arm/nvidia/soc_tegra124.c
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@ -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>
@ -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 @@ static struct tegra124_cpufreq_rate {
void
tegra124_cpuinit(void)
{
/* Set VDD_CPU voltage to 1.4V */
tegra_car_periph_i2c_enable(4, 204000000);
tegra_i2c_dvc_write(0x40, 0x4f00, 2);
/* Set VDD_CPU voltage to 1.4V */
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);