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| author | Kevin K Wong <kevin.k.wong@intel.com> | 2016-06-21 19:11:10 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2016-06-23 03:28:26 -0700 |
| commit | 4d37fe58bbbe3349db3b828ce1a1f7ac282b710a (patch) | |
| tree | 34e7bb6c6f6642da70405413b840db64c06ebf1d | |
| parent | d8b545b17720ebbbefd9518071b8e8441faacc6e (diff) | |
| download | chrome-ec-4d37fe58bbbe3349db3b828ce1a1f7ac282b710a.tar.gz | |
reef: force PMIC reset on initial boot
On EC reset where PMIC_EN will be pulled low,
PMIC could get into an unknown state and will
not sequence properly on sub-sequent boot.
This is a temporary workaround for Reef Proto,
a hardware change will be implemented on EVT.
BUG=chrome-os-partner:53974,chrome-os-partner:54507
BRANCH=none
TEST=Reef powers to S0 and starts coreboot after EC reset
Tested with servo cold reset button
and console reboot command
Change-Id: I32aa004b000895da2c97d1014a8ef48c0a98779d
Signed-off-by: Kevin K Wong <kevin.k.wong@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/354762
Reviewed-by: Shawn N <shawnn@chromium.org>
| -rw-r--r-- | board/reef/board.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/board/reef/board.c b/board/reef/board.c index 226925098f..324ff47941 100644 --- a/board/reef/board.c +++ b/board/reef/board.c @@ -285,6 +285,23 @@ DECLARE_HOOK(HOOK_CHIPSET_PRE_INIT, chipset_pre_init, HOOK_PRIO_DEFAULT); /* Initialize board. */ static void board_init(void) { + /* + * FIXME: Not required for EVT which PMIC will reset properly + * + * By removing the power rail while PMIC is enabled, + * PMIC will sense a power fault and reset itself. + */ + if (!system_jumped_to_this_image()) { + /* Disable all power rail */ + gpio_set_level(GPIO_EN_PP3300, 0); + gpio_set_level(GPIO_EN_PP5000, 0); + + /* Toggle PMIC_EN */ + gpio_set_level(GPIO_V5A_EN, 1); + msleep(500); + gpio_set_level(GPIO_V5A_EN, 0); + } + /* FIXME: Handle tablet mode */ /* gpio_enable_interrupt(GPIO_TABLET_MODE_L); */ |