1 files changed, 91 insertions, 0 deletions
diff --git a/src/mainboard/lenovo/t400/hybrid_graphics.c b/src/mainboard/lenovo/t400/hybrid_graphics.c
new file mode 100644
index 0000000000..b313ffa49c
--- /dev/null
+++ b/src/mainboard/lenovo/t400/hybrid_graphics.c
@@ -0,0 +1,91 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 secunet Security Networks AG
+ *
+ * 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 <stdint.h>
+#include <string.h>
+#include <southbridge/intel/common/gpio.h>
+#include <northbridge/intel/gm45/gm45.h>
+#include <console/console.h>
+#include <option.h>
+
+#define HYBRID_GRAPHICS_INTEGRATED_ONLY 0
+#define HYBRID_GRAPHICS_DISCRETE_ONLY 1
+#define HYBRID_GRAPHICS_SWITCHABLE 2
+
+#define MUX_GPIO 22
+#define BCL_CTL_GPIO 19
+#define GFX_PWR_EN_GPIO 49
+
+#define HYBRID_DETECT_GPIO 21
+
+void hybrid_graphics_init(sysinfo_t *sysinfo);
+
+static bool hybrid_graphics_installed(void)
+{
+	if (get_gpio(HYBRID_DETECT_GPIO))
+		return false;
+	else
+		return true;
+}
+
+void hybrid_graphics_init(sysinfo_t *sysinfo)
+{
+	/* Set default mode */
+	uint8_t hybrid_graphics_mode =
+	    HYBRID_GRAPHICS_INTEGRATED_ONLY;
+
+	if (!hybrid_graphics_installed()) {
+		printk(BIOS_DEBUG, "Hybrid graphics not installed.\n");
+		/* The display is not connected to a mux or switchable. */
+		sysinfo->enable_igd = 1;
+		sysinfo->enable_peg = 0;
+		return;
+	}
+
+	printk(BIOS_DEBUG, "Hybrid graphics available: ");
+	get_option(&hybrid_graphics_mode, "hybrid_graphics_mode");
+
+	/* Select appropriate hybrid graphics device */
+	switch (hybrid_graphics_mode) {
+	default:
+	case HYBRID_GRAPHICS_INTEGRATED_ONLY:
+		printk(BIOS_DEBUG, "Activating Integrated Only.\n");
+		set_gpio(MUX_GPIO, GPIO_LEVEL_LOW);
+		set_gpio(BCL_CTL_GPIO, GPIO_LEVEL_LOW);
+		set_gpio(GFX_PWR_EN_GPIO, GPIO_LEVEL_LOW);
+
+		sysinfo->enable_igd = 1;
+		sysinfo->enable_peg = 0;
+		break;
+	case HYBRID_GRAPHICS_DISCRETE_ONLY:
+		printk(BIOS_DEBUG, "Activating Discrete Only.\n");
+		set_gpio(MUX_GPIO, GPIO_LEVEL_HIGH);
+		set_gpio(BCL_CTL_GPIO, GPIO_LEVEL_HIGH);
+		set_gpio(GFX_PWR_EN_GPIO, GPIO_LEVEL_HIGH);
+
+		sysinfo->enable_igd = 0;
+		sysinfo->enable_peg = 1;
+		break;
+	case HYBRID_GRAPHICS_SWITCHABLE:
+		printk(BIOS_DEBUG, "Activating Switchable (both GPUs).\n");
+		set_gpio(MUX_GPIO, GPIO_LEVEL_LOW);
+		set_gpio(BCL_CTL_GPIO, GPIO_LEVEL_LOW);
+		set_gpio(GFX_PWR_EN_GPIO, GPIO_LEVEL_HIGH);
+
+		sysinfo->enable_igd = 1;
+		sysinfo->enable_peg = 1;
+		break;
+	}
+}