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Turn on 3.3V rail earlier in power sequence for pit

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The 3.3V rails powers some of the buck supplies, so must be turned on
1ms after the 5V rail.

BUG=chrome-os-partner:18657
BRANCH=none
TEST=build pit, snow

Change-Id: I18a165744352ae375080824fecfeb56f6ac81a9c
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/48729
Reviewed-by: Vic Yang <victoryang@chromium.org>
This commit is contained in:
Randall Spangler
2013-04-19 17:05:08 -07:00
committed by ChromeBot
parent 8f00a3beee
commit dcb2425f45
1 changed files with 22 additions and 6 deletions
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28
common/gaia_power.c
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@@ -42,8 +42,11 @@
#define CPUTS(outstr) cputs(CC_CHIPSET, outstr)
#define CPRINTF(format, args...) cprintf(CC_CHIPSET, format, ## args)
/* Time necessary for the 5v regulator output to stabilize */
#define DELAY_5V_SETUP MSEC /* 1ms */
/* Time necessary for the 5V and 3.3V regulator outputs to stabilize */
#define DELAY_5V_SETUP MSEC
#ifdef BOARD_pit
#define DELAY_3V_SETUP MSEC
#endif
/* Delay between 1.35v and 3.3v rails startup */
#define DELAY_RAIL_STAGGERING 100 /* 100us */
@@ -352,6 +355,7 @@ void chipset_force_shutdown(void)
static int check_for_power_on_event(void)
{
/* the system is already ON */
/* TODO: this isn't the right check for pit */
if (gpio_get_level(GPIO_EN_PP3300)) {
CPRINTF("[%T system is on, thus clear auto_power_on]\n");
auto_power_on = 0; /* no need to arrange another power on */
@@ -397,9 +401,18 @@ static int power_on(void)
{
/* Enable 5v power rail */
gpio_set_level(GPIO_EN_PP5000, 1);
/* wait to have stable power */
/* Wait for it to stabilize */
usleep(DELAY_5V_SETUP);
#ifdef BOARD_pit
/*
* 3.3V rail must come up right after 5V, because it sources power to
* various buck supplies.
*/
gpio_set_level(GPIO_EN_PP3300, 1);
usleep(DELAY_3V_SETUP);
#endif
if (gpio_get_level(GPIO_SOC1V8_XPSHOLD) == 0) {
/* Initialize non-AP components */
hook_notify(HOOK_CHIPSET_PRE_INIT);
@@ -416,10 +429,11 @@ static int power_on(void)
/*
* If PP1800_LDO2 did not come up (e.g. PMIC_TIMEOUT was reached),
* turn off 5v rail and start over.
* turn off 5V rail (and 3.3V, if turned on above) and start over.
*/
if (gpio_get_level(GPIO_PP1800_LDO2) == 0) {
gpio_set_level(GPIO_EN_PP5000, 0);
gpio_set_level(GPIO_EN_PP3300, 0);
usleep(DELAY_5V_SETUP);
CPUTS("Fatal error: PMIC failed to enable\n");
return -1;
@@ -427,10 +441,12 @@ static int power_on(void)
/* Enable DDR 1.35v power rail */
gpio_set_level(GPIO_EN_PP1350, 1);
/* wait to avoid large inrush current */
/* Wait to avoid large inrush current */
usleep(DELAY_RAIL_STAGGERING);
/* Enable 3.3v power rail */
/* Enable 3.3v power rail, if it's not already on */
gpio_set_level(GPIO_EN_PP3300, 1);
ap_on = 1;
disable_sleep(SLEEP_MASK_AP_RUN);
powerled_set_state(POWERLED_STATE_ON);