mb/google/kukui: Support eDP panels via PS8640

Some Kukui variants may have eDP panels connected via a PS8640 MIPI bridge
which we may retrieve EDID dynamically.

BUG=b🅱️137517228
TEST=emerge-jacuzzi coreboot chromeos-bootimage; boots and see display.

Change-Id: I85aac5255e6a3e6019299670486214ecffbf9801
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34516
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/kukui/Kconfig

@@ -41,6 +41,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
 	select MAINBOARD_FORCE_NATIVE_VGA_INIT
 	select HAVE_LINEAR_FRAMEBUFFER
+	select DRIVER_PARADE_PS8640 if BOARD_GOOGLE_JACUZZI
 
 config MAINBOARD_DIR
 	string

src/mainboard/google/kukui/Makefile.inc

@@ -27,4 +27,5 @@ ramstage-y += memlayout.ld
 ramstage-$(CONFIG_BOARD_GOOGLE_KODAMA) += panel_kodama.c
 ramstage-$(CONFIG_BOARD_GOOGLE_KRANE) += panel_krane.c
 ramstage-$(CONFIG_BOARD_GOOGLE_KUKUI) += panel_kukui.c
+ramstage-$(CONFIG_DRIVER_PARADE_PS8640) += panel_ps8640.c
 ramstage-y += reset.c

src/mainboard/google/kukui/panel_ps8640.c

@@ -0,0 +1,73 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <delay.h>
+#include <drivers/parade/ps8640/ps8640.h>
+#include <edid.h>
+#include <gpio.h>
+#include <soc/i2c.h>
+#include <string.h>
+
+#include "panel.h"
+
+
+static void power_on_ps8640(void)
+{
+	gpio_output(GPIO_MIPIBRDG_RST_L_1V8, 0);
+	gpio_output(GPIO_PP1200_MIPIBRDG_EN, 1);
+	gpio_output(GPIO_VDDIO_MIPIBRDG_EN, 1);
+	mdelay(2);
+	gpio_output(GPIO_MIPIBRDG_PWRDN_L_1V8, 1);
+	mdelay(2);
+	gpio_output(GPIO_MIPIBRDG_RST_L_1V8, 1);
+	gpio_output(GPIO_PP3300_LCM_EN, 1);
+}
+
+static void dummy_power_on(void)
+{
+	/* The panel has been already powered on when getting panel information
+	 * so we should do nothing here.
+	 */
+}
+
+static struct panel_description ps8640_panel = {
+	.power_on = dummy_power_on,
+	.orientation = LB_FB_ORIENTATION_NORMAL,
+	.init = { INIT_END_CMD },
+};
+
+struct panel_description *get_panel_description(int panel_id)
+{
+	static char mode_name[64];
+
+	/* To read panel EDID, we have to first power on PS8640. */
+	power_on_ps8640();
+
+	u8 i2c_bus = 4, i2c_addr = 0x08;
+	mtk_i2c_bus_init(i2c_bus);
+
+	ps8640_init(i2c_bus, i2c_addr);
+	struct edid *edid = &ps8640_panel.edid;
+	if (ps8640_get_edid(i2c_bus, i2c_addr, edid)) {
+		printk(BIOS_ERR, "Can't get panel's edid\n");
+		return NULL;
+	}
+	/* TODO(hungte) Move this to ps8640_get_edid */
+	snprintf(mode_name, sizeof(mode_name), "%dx%d@%dHz", edid->x_resolution,
+		 edid->y_resolution, edid->mode.refresh);
+	ps8640_panel.edid.mode.name = mode_name;
+	return &ps8640_panel;
+}