1 files changed, 43 insertions, 0 deletions
diff --git a/src/drivers/apple/hybrid_graphics/romstage.c b/src/drivers/apple/hybrid_graphics/romstage.c
new file mode 100644
index 0000000000..8f2667111b
--- /dev/null
+++ b/src/drivers/apple/hybrid_graphics/romstage.c
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <types.h>
+#include <option.h>
+#include <device/device.h>
+#include <console/console.h>
+#include "hybrid_graphics.h"
+#include "chip.h"
+#include "gmux.h"
+
+void early_hybrid_graphics(bool *enable_igd, bool *enable_peg)
+{
+	const struct device *dev;
+	enum hybrid_graphics_req mode = HYBRID_GRAPHICS_DEFAULT_GPU;
+
+	/* TODO: Use generic device instead of dummy PNP device */
+	dev = dev_find_slot_pnp(HYBRID_GRAPHICS_PORT, HYBRID_GRAPHICS_DEVICE);
+
+	if (!dev || !dev->chip_info) {
+		printk(BIOS_ERR, "Hybrid graphics: ERROR\n");
+		*enable_igd = true;
+		*enable_peg = false;
+		return;
+	}
+
+	get_option(&mode, "hybrid_graphics_mode");
+
+	if (mode == HYBRID_GRAPHICS_DISCRETE) {
+		printk(BIOS_DEBUG, "Hybrid graphics:"
+			   " Disabling integrated GPU.\n");
+
+		*enable_igd = false;
+		*enable_peg = true;
+	} else if (mode == HYBRID_GRAPHICS_INTEGRATED) {
+		printk(BIOS_DEBUG, "Hybrid graphics:"
+			   " Disabling discrete GPU.\n");
+
+		*enable_igd = true;
+		*enable_peg = false;
+	}
+
+	gmux_dgpu_power_enable(dev, *enable_peg);
+}