samus: Changes for Proto1b

- disable PP1800_PGOOD internal pullup
- add PP3300_DSW_EN control on PF6, turned on in S5 and off in G3
- change PCH_WAKE_L and PCH_PWRBTN_L to open drain signals
- add PCH_BL_EN interrupt on PM3 for rising edge to put backlight
controller into PWM mode, remove 1 second hook
- add samus-specific extpower handler for AC_PRESENT to buffer the
AC_PRESENT input to the new PCH_ACOK output on PM6.  this is driven
high in S5/S3/S0 when AC_PRESENT is high, otherwise driven low.

BUG=chrome-os-partner:23752
BRANCH=samus
TEST=emerge-samus chromeos-ec

Change-Id: Ie8ab538610e41914212ee1f3a6287b63474fb85b
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/175281
Reviewed-by: Bill Richardson <wfrichar@chromium.org>

1 files changed, 7 insertions, 18 deletions

diff --git a/board/samus/panel.c b/board/samus/panel.c
index 5704179d5d..9b62f0e2c9 100644
--- a/board/samus/panel.c
+++ b/board/samus/panel.c
@@ -61,26 +61,14 @@ DECLARE_HOST_COMMAND(EC_CMD_SWITCH_ENABLE_BKLIGHT,
 		     switch_command_enable_backlight,
 		     EC_VER_MASK(0));
 
-/**
- * Hook to turn backlight PWM mode on if it turns off.
- */
-static void backlight_pwm_mode_hook(void)
+void backlight_interrupt(enum gpio_signal signal)
 {
-	int reg;
-
-	/* Only check if the system is powered. */
-	if (!chipset_in_state(CHIPSET_STATE_ON))
-		return;
-
-	/* Read current command reg to see if it is on. */
-	i2c_read8(I2C_PORT_BACKLIGHT, I2C_ADDR_BACKLIGHT,
-		  LP8555_REG_COMMAND, &reg);
-
-	/* Turn it on if needed. */
-	if (!(reg & LP8555_REG_COMMAND_ON))
-		lp8555_enable_pwm_mode();
+	/*
+	 * PCH indicates it is turning on backlight so we should
+	 * attempt to put the backlight controller into PWM mode.
+	 */
+	lp8555_enable_pwm_mode();
 }
-DECLARE_HOOK(HOOK_SECOND, backlight_pwm_mode_hook, HOOK_PRIO_LAST);
 
 /**
  * Update backlight state.
@@ -100,6 +88,7 @@ DECLARE_HOOK(HOOK_LID_CHANGE, update_backlight, HOOK_PRIO_DEFAULT);
  */
 static void backlight_init(void)
 {
+	gpio_enable_interrupt(GPIO_PCH_BL_EN);
 	update_backlight();
 }
 DECLARE_HOOK(HOOK_INIT, backlight_init, HOOK_PRIO_DEFAULT);