mec1322: hibernate: Don't reconfigure all GPIOs

Configuring all GPIOs to INPUT / PULL_UP in hibernate is not a good
idea:

- INPUT / PULL_UP is not necessarially the lowest-power state (for
  example, if there is an onboard pull-down).
- Most GPIOs should already be in lowest-power state when we're in S5.
- For the few GPIOs that need to be in a different state for hibernate,
  we can use a board-level callback.

In addition, remove mec1322 code related to restoring from hibernate
state, since we always reset coming out of hibernate.

BUG=chrome-os-partner:49608
BRANCH=glados, strago
TEST=`hibernate` on chell console when in S5 and AC removed. Verify that
EC power is roughly equivalent to low-power idle power. Attach Zinger,
verify that device wakes and boots, and charges from charger.

Change-Id: Ib00ef035bec32cea3847eb38d743f5c0cec896ca
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/322937
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/gpio.h b/include/gpio.h
index 060ef97c33..8c7e420cd9 100644
--- a/include/gpio.h
+++ b/include/gpio.h
@@ -252,4 +252,7 @@ void gpio_set_alternate_function(uint32_t port, uint32_t mask, int func);
  */
 void gpio_enable_clocks(void);
 
+/* Optional board-level function to set hibernate GPIO states. */
+void board_set_gpio_hibernate_state(void) __attribute__((weak));
+
 #endif  /* __CROS_EC_GPIO_H */