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power: rk3399: Minimize resume latency on short suspend

Browse Source 
BUG=chrome-os-partner:56605
BRANCH=None
TEST=Manual on kevin, modify code to force CHECK_ABORTED_SUSPEND()
condition to be true for each respective case, verify AP resumes
successfully.

Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Change-Id: Ib3ec3c287c14ea2b9b410171a173c38c9385a90f
Reviewed-on: https://chromium-review.googlesource.com/378078
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2016-08-30 12:52:42 -07:00
committed by chrome-bot
parent 946921a974
commit e54af6574a
1 changed files with 25 additions and 0 deletions
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25
power/rk3399.c
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@@ -97,6 +97,19 @@ DECLARE_DEFERRED(force_shutdown);
*/
#define PGOOD_AP_DEBOUNCE_TIMEOUT (100 * MSEC)
/*
* The AP informs the EC of its S0 / S3 state through IN_SUSPEND_DEASSERTED /
* AP_EC_S3_S0_L. Latency between deassertion and power rails coming up must
* be minimized, so check for deassertion at various stages of our suspend
* power sequencing, and immediately transition out of suspend if necessary.
*/
#define CHECK_ABORTED_SUSPEND() \
if (!forcing_shutdown && \
power_get_signals() & IN_SUSPEND_DEASSERTED) { \
CPRINTS("suspend aborted"); \
return POWER_S3S0; \
}
enum power_state power_handle_state(enum power_state state)
{
static int sys_reset_asserted;
@@ -259,20 +272,32 @@ enum power_state power_handle_state(enum power_state state)
case POWER_S0S3:
/* Call hooks before we remove power rails */
hook_notify(HOOK_CHIPSET_SUSPEND);
CHECK_ABORTED_SUSPEND();
msleep(10);
CHECK_ABORTED_SUSPEND();
gpio_set_level(GPIO_PP1800_SENSOR_EN_L, 1);
gpio_set_level(GPIO_PP1800_SIXAXIS_EN_L, 1);
gpio_set_level(GPIO_PP3300_S0_EN_L, 1);
msleep(10);
CHECK_ABORTED_SUSPEND();
gpio_set_level(GPIO_PP1800_S0_EN_L, 1);
msleep(10);
CHECK_ABORTED_SUSPEND();
gpio_set_level(GPIO_AP_CORE_EN, 0);
msleep(10);
CHECK_ABORTED_SUSPEND();
gpio_set_level(GPIO_PP1800_AP_AVDD_EN_L, 1);
msleep(10);
CHECK_ABORTED_SUSPEND();
gpio_set_level(GPIO_PP900_DDRPLL_EN, 0);
msleep(10);
CHECK_ABORTED_SUSPEND();
/*
* Enable idle task deep sleep. Allow the low power idle task