yorp: Control backlight based on chipset transitions

This change enables/disables backlight based on the chipset state
transition.

BUG=b:78897667
BRANCH=None
TEST=None

Change-Id: I4da331cb94f7a304a76fce93b73c38016f5b0f4d
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1036798
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
Reviewed-by: Justin TerAvest <teravest@chromium.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/board/yorp/board.c b/board/yorp/board.c
index 133e0da19f..d573571aff 100644
--- a/board/yorp/board.c
+++ b/board/yorp/board.c
@@ -213,6 +213,12 @@ static void board_chipset_resume(void)
 {
 	/* Enable Trackpad Power when chipset is in S0 */
 	gpio_set_level(GPIO_EN_P3300_TRACKPAD_ODL, 0);
+
+	/*
+	 * GPIO_ENABLE_BACKLIGHT is AND'ed with SOC_EDP_BKLTEN from the SoC and
+	 * LID_OPEN connection in hardware.
+	 */
+	gpio_set_level(GPIO_ENABLE_BACKLIGHT, 1);
 }
 DECLARE_HOOK(HOOK_CHIPSET_RESUME, board_chipset_resume, HOOK_PRIO_DEFAULT);
 
@@ -221,6 +227,12 @@ static void board_chipset_suspend(void)
 {
 	/* Disable Trackpad Power when chipset transitions to sleep state */
 	gpio_set_level(GPIO_EN_P3300_TRACKPAD_ODL, 1);
+
+	/*
+	 * GPIO_ENABLE_BACKLIGHT is AND'ed with SOC_EDP_BKLTEN from the SoC and
+	 * LID_OPEN connection in hardware.
+	 */
+	gpio_set_level(GPIO_ENABLE_BACKLIGHT, 0);
 }
 DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, board_chipset_suspend, HOOK_PRIO_DEFAULT);