[S] Change in coreboot[main]: mb/google/rauru: Support the panel with a load switch control

[Yidi Lin (Code Review)]

Yidi Lin has submitted this change. ( https://review.coreboot.org/c/coreboot/+/86282?usp=email )

Change subject: mb/google/rauru: Support the panel with a load switch control
......................................................................

mb/google/rauru: Support the panel with a load switch control

The Rauru follower device goes `load switch` path to ensure the
discharge timing meets the panel power-off sequence. Refactor panel.c to
support this hardware change.

Remove PANEL from fw_config since this is a board-specific change.

BRANCH=rauru
BUG=b:339580836
TEST=verify firmware screen on Navi

Change-Id: I57dcaa2a0b5af94fe3fa3eaf04e9f3159c51d144
Signed-off-by: Yidi Lin 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86282
Tested-by: build bot (Jenkins) 
Reviewed-by: Yu-Ping Wu 
---
M src/mainboard/google/rauru/devicetree.cb
M src/mainboard/google/rauru/panel.c
2 files changed, 7 insertions(+), 14 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Yu-Ping Wu: Looks good to me, approved

diff --git a/src/mainboard/google/rauru/devicetree.cb b/src/mainboard/google/rauru/devicetree.cb
index 55cc91c..1705dbe 100644
--- a/src/mainboard/google/rauru/devicetree.cb
+++ b/src/mainboard/google/rauru/devicetree.cb
@@ -8,13 +8,6 @@
    end
 end

-fw_config
-	field PANEL 18 21
-		option DEFAULT 0
-		option OLED 1
-	end
-end
-
 chip soc/mediatek/mt8196
    device cpu_cluster 0 on end

diff --git a/src/mainboard/google/rauru/panel.c b/src/mainboard/google/rauru/panel.c
index 8564f4c..37e4001 100644
--- a/src/mainboard/google/rauru/panel.c
+++ b/src/mainboard/google/rauru/panel.c
@@ -27,23 +27,23 @@
    .orientation = LB_FB_ORIENTATION_NORMAL,
 };

-static void power_on_oled_panel(void)
+static void power_on_load_switch(void)
 {
    gpio_output(GPIO_EN_PP3300_EDP_X, 1);
    gpio_set_mode(GPIO_EDP_HPD_1V8, GPIO_FUNC(EINT13, EDP_TX_HPD));
 }

-static struct panel_description oled_panel = {
+static struct panel_description edp_panel = {
    .configure_backlight = configure_backlight,
-	.power_on = power_on_oled_panel,
+	.power_on = power_on_load_switch,
    .disp_path = DISP_PATH_EDP,
    .orientation = LB_FB_ORIENTATION_NORMAL,
 };

struct panel_description *get_active_panel(void)
 {
-	if (fw_config_probe(FW_CONFIG(PANEL, OLED))) {
-		return &oled_panel;
-	}
-	return &panel;
+	if (CONFIG(BOARD_GOOGLE_RAURU))
+		return &panel;
+
+	return &edp_panel;
 }