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| author | Furquan Shaikh <furquan@chromium.org> | 2017-01-20 11:42:33 -0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2017-01-23 03:48:08 -0800 |
| commit | 0196dc9c1aa170bad826e8d061654ed2144b68bf (patch) | |
| tree | 98e12feb9e390584f7dcef349087b49f2693f1e9 /power/skylake.c | |
| parent | 4dba3792ef2023dcd8e8e3766a34d4fde2aca082 (diff) | |
| download | chrome-ec-0196dc9c1aa170bad826e8d061654ed2144b68bf.tar.gz | |
power/skylake: Add option to reset pmic using LDO_EN
Add a config option that can be used by chipset to provide PMIC reset
using LDO_EN. This is required for ensuring that the AP is power
cycled properly. Implement the special pmic reset for skylake
chipsets.
BUG=chrome-os-partner:61883
BRANCH=None
TEST=Verified that reboot on EC console resets the AP and does not get
stuck in G3 on poppy.
Change-Id: I5f680fede5cb4effa86243f51edfdea09db4d975
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/431192
Reviewed-by: Duncan Laurie <dlaurie@google.com>
Diffstat (limited to 'power/skylake.c')
| -rw-r--r-- | power/skylake.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/power/skylake.c b/power/skylake.c index 2e5425a794..3afa94a684 100644 --- a/power/skylake.c +++ b/power/skylake.c @@ -8,10 +8,12 @@ #include "chipset.h" #include "console.h" #include "gpio.h" +#include "hooks.h" #include "intel_x86.h" #include "lpc.h" #include "power_button.h" #include "skylake.h" +#include "system.h" #include "timer.h" /* Console output macros */ @@ -109,3 +111,38 @@ enum power_state power_handle_state(enum power_state state) return new_state; } + +#ifdef CONFIG_CHIPSET_HAS_PLATFORM_PMIC_RESET +static void chipset_handle_reboot(void) +{ + int flags; + + if (system_jumped_to_this_image()) + return; + + /* Interrogate current reset flags from previous reboot. */ + flags = system_get_reset_flags(); + + /* + * Do not make PMIC re-sequence the power rails if the following reset + * conditions are not met. + */ + if (!(flags & + (RESET_FLAG_WATCHDOG | RESET_FLAG_SOFT | RESET_FLAG_HARD))) + return; + + /* Preserve AP off request. */ + if (flags & RESET_FLAG_AP_OFF) + chip_save_reset_flags(RESET_FLAG_AP_OFF); + + ccprintf("Restarting system with PMIC.\n"); + /* Flush console */ + cflush(); + + /* Bring down all rails but RTC rail (including EC power). */ + gpio_set_level(GPIO_EC_PLATFORM_RST, 1); + while (1) + ; /* wait here */ +} +DECLARE_HOOK(HOOK_INIT, chipset_handle_reboot, HOOK_PRIO_FIRST); +#endif |