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samus: allow booting without a battery

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When there is no battery, add a delay in power sequencing to
allow time for PD MCU to negotiate to 20V. This is a temporary
solution to allow booting without a battery for a factory.

BUG=chrome-os-partner:31583
BRANCH=none
TEST=Boot without a battery 10 times successfully. Also looked
at timestamps on console. PD MCU tends to successfully negotiate
before 370ms. With this added delay, the EC will come out of S5
at around 660ms.

Change-Id: I88dcb10b2cfef2cdb3e943c24d567ba5b741d729
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/214038
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Alec Berg
2014-08-25 14:05:08 -07:00
committed by chrome-internal-fetch
parent 334bc80cb6
commit 1aa13eb648
1 changed files with 14 additions and 0 deletions
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14
board/samus/power_sequence.c
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@@ -5,6 +5,7 @@
/* X86 chipset power control module for Chrome EC */
#include "battery.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
@@ -184,6 +185,8 @@ DECLARE_HOOK(HOOK_LID_CHANGE, update_touchscreen, HOOK_PRIO_DEFAULT);
enum power_state power_handle_state(enum power_state state)
{
struct batt_params batt;
switch (state) {
case POWER_G3:
break;
@@ -310,6 +313,17 @@ enum power_state power_handle_state(enum power_state state)
return POWER_S5;
case POWER_S5S3:
/*
* TODO(crosbug.com/p/31583): Temporary hack to allow booting
* without battery. If battery is not present here, then delay
* to give time for PD MCU to negotiate to 20V.
*/
battery_get_params(&batt);
if (batt.is_present != BP_YES && !system_is_locked()) {
CPRINTS("Attempting boot w/o battery, adding delay");
msleep(500);
}
/* Turn on power to RAM */
gpio_set_level(GPIO_PP1800_EN, 1);
gpio_set_level(GPIO_PP1200_EN, 1);