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mec1322: Power state transition in case of apshutdown

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In case of 'apshutdown', SOC loses power immediately
while EC is waiting for SOC's PMC_SUSPWRDNACK signal
forever.

BUG=chrome-os-partner:43038
TEST=Cyan
BRANCH=none

Change-Id: I34321d00a89011e90222ea5916a42e9a51d4f4b0
Signed-off-by: Kyoung Kim <kyoung.il.kim@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/288203
Reviewed-by: Shawn N <shawnn@chromium.org>
Commit-Queue: Divya Jyothi <divya.jyothi@intel.com>
This commit is contained in:
Kyoung Kim
2015-07-23 10:49:47 -07:00
committed by ChromeOS Commit Bot
parent 6eecf91b63
commit 4ff95401b5
1 changed files with 21 additions and 0 deletions
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21
power/braswell.c
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@@ -51,6 +51,7 @@
#define IN_ALL_S0 (IN_PGOOD_S0 | IN_ALL_PM_SLP_DEASSERTED)
static int throttle_cpu; /* Throttle CPU? */
static int forcing_shutdown; /* Forced shutdown in progress? */
void chipset_force_shutdown(void)
{
@@ -62,6 +63,7 @@ void chipset_force_shutdown(void)
*/
gpio_set_level(GPIO_PCH_SYS_PWROK, 0);
gpio_set_level(GPIO_PCH_RSMRST_L, 0);
forcing_shutdown = 1;
}
void chipset_reset(int cold_reset)
@@ -279,6 +281,25 @@ enum power_state power_handle_state(enum power_state state)
return power_get_pause_in_s5() ? POWER_S5 : POWER_S5G3;
case POWER_S5G3:
/*
* in case shutdown is already done by apshutdown
* (or chipset_force_shutdown()), SOC already lost
* power and can't assert PMC_SUSPWRDNACK any more.
*/
if (forcing_shutdown) {
/* Config pins for SOC G3 */
gpio_config_module(MODULE_GPIO, 1);
#ifndef CONFIG_PMIC
gpio_set_level(GPIO_SUSPWRDNACK_SOC_EC, 1);
#endif
forcing_shutdown = 0;
CPRINTS("Enter SOC G3");
return POWER_G3;
}
if (gpio_get_level(GPIO_PCH_SUSPWRDNACK) == 1) {
/* Assert RSMRST# */
gpio_set_level(GPIO_PCH_RSMRST_L, 0);