drivers/lenovo: Add hybrid graphics driver

Add a universal hybrid graphics driver compatible with
all supported lenovo devices.
Hybrid graphics allows to connect the display panel to
either of one GPUs.
As there are only two GPUs one GPIO needs to be toggled.
In case the discrete GPU is activated the panel is routed to it.
On deactivation the panel is routed to the integrated
GPU.
On lenovo laptops the dGPU is always connected to PEG10 and it is
save to disable the PEG slot on dGPU deactivation.

Use common gpio.c for southbridge I82801IX.

Tested on Lenovo T520 using Nvidia NVS 5200m.

Removed Lenovo T430s from the list of supported devices,
as the T430s only supports "muxless Optimus".

Depends on change id:
Iccc6d254bafb927b6470704cec7c9dd7528e2c68
Ibb54c03fd83a529d1ceccfb2c33190e7d42224d8
I8bd981c4696c174152cf41caefa6c083650d283a
Iaf0c2f941f2625a5547f9cba79da1b173da6f295
I994114734fa931926c34ed04305cddfbeb429b62

Change-Id: I9b80b31a7749bdf893ed3b772a6505c9f29a56d1
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/12896
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@googlemail.com>

3 files changed, 139 insertions, 0 deletions

diff --git a/src/drivers/lenovo/Kconfig b/src/drivers/lenovo/Kconfig
index f20f3b2229..f8eddf2a80 100644
--- a/src/drivers/lenovo/Kconfig
+++ b/src/drivers/lenovo/Kconfig
@@ -27,3 +27,16 @@ config DIGITIZER_ABSENT
 endchoice
 
 endif
+
+config DRIVERS_LENOVO_HYBRID_GRAPHICS
+	bool
+	default n
+
+config HYBRID_GRAPHICS_GPIO_NUM
+	depends on DRIVERS_LENOVO_HYBRID_GRAPHICS
+	int
+	default 52
+	help
+	  Set a default GPIO that sets the panel LVDS signal routing to
+	  integrated or discrete GPU.
+
diff --git a/src/drivers/lenovo/Makefile.inc b/src/drivers/lenovo/Makefile.inc
index c50db5b8be..66f8594bf9 100644
--- a/src/drivers/lenovo/Makefile.inc
+++ b/src/drivers/lenovo/Makefile.inc
@@ -1 +1,2 @@
 ramstage-$(CONFIG_DRIVERS_LENOVO_WACOM) += wacom.c
+ramstage-$(CONFIG_DRIVERS_LENOVO_HYBRID_GRAPHICS) += hybrid_graphics.c
diff --git a/src/drivers/lenovo/hybrid_graphics.c b/src/drivers/lenovo/hybrid_graphics.c
new file mode 100644
index 0000000000..9b46646e4b
--- /dev/null
+++ b/src/drivers/lenovo/hybrid_graphics.c
@@ -0,0 +1,125 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015-2016 Patrick Rudolph
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
+ *
+ * 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 <types.h>
+#include <string.h>
+#include <option.h>
+#include <device/device.h>
+#include <device/pci_def.h>
+#include <device/pci_ops.h>
+#include <device/pci_ids.h>
+#include <device/pci.h>
+#include <console/console.h>
+#include <southbridge/intel/common/gpio.h>
+
+/* Hybrid graphics allows to connect LVDS interface to either iGPU
+ * or dGPU depending on GPIO level.
+ * Nvidia is calling this functionality "muxed Optimus".
+ * Some devices, like T430s, only support "muxless Optimus" where the
+ * Intel GPU is always connected to the panel.
+ * As it is only linked on lenovo and only executed if the GPU exists
+ * we know for sure that the dGPU is there and connected to first PEG slot.
+ *
+ * Note: Once native gfx init is done for AMD or Nvida graphic
+ *       cards, merge this code.
+ */
+
+#define HYBRID_GRAPHICS_INTEGRATED 0
+#define HYBRID_GRAPHICS_DISCRETE 1
+
+static void hybrid_graphics_disable_peg(struct device *dev)
+{
+	struct device *peg_dev;
+
+	/* connect LVDS interface to iGPU */
+	set_gpio(CONFIG_HYBRID_GRAPHICS_GPIO_NUM, GPIO_LEVEL_HIGH);
+	printk(BIOS_DEBUG, "Hybrid graphics: Switching panel to integrated GPU.\n");
+	dev->enabled = 0;
+
+	/* Disable PEG10 */
+	peg_dev = dev_find_slot(0, PCI_DEVFN(1, 0));
+	if (peg_dev)
+		peg_dev->enabled = 0;
+
+	printk(BIOS_DEBUG, "Hybrid graphics: Disabled PEG10.\n");
+}
+
+/* Called before VGA enable bits are set and only if dGPU
+ * is present. Enable/disable VGA devices here. */
+static void hybrid_graphics_enable_peg(struct device *dev)
+{
+	u8 hybrid_graphics_mode;
+
+	hybrid_graphics_mode = HYBRID_GRAPHICS_INTEGRATED;
+	get_option(&hybrid_graphics_mode, "hybrid_graphics_mode");
+
+	if (hybrid_graphics_mode == HYBRID_GRAPHICS_DISCRETE) {
+		/* connect LVDS interface to dGPU */
+		set_gpio(CONFIG_HYBRID_GRAPHICS_GPIO_NUM, GPIO_LEVEL_LOW);
+		printk(BIOS_DEBUG, "Hybrid graphics: Switching panel to discrete GPU.\n");
+		dev->enabled = 1;
+
+		/* Disable IGD */
+		dev = dev_find_slot(0, PCI_DEVFN(2, 0));
+		if (dev && dev->ops->disable)
+			dev->ops->disable(dev);
+		dev->enabled = 0;
+
+		printk(BIOS_DEBUG, "Hybrid graphics: Disabled IGD.\n");
+	} else
+		hybrid_graphics_disable_peg(dev);
+}
+
+static struct pci_operations pci_dev_ops_pci = {
+	.set_subsystem = pci_dev_set_subsystem,
+};
+
+struct device_operations hybrid_graphics_ops = {
+	.read_resources   = pci_dev_read_resources,
+	.set_resources    = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.init             = pci_dev_init,
+	.scan_bus         = 0,
+	.enable           = hybrid_graphics_enable_peg,
+	.disable          = hybrid_graphics_disable_peg,
+	.ops_pci          = &pci_dev_ops_pci,
+};
+
+static const unsigned short pci_device_ids_nvidia[] = {
+		0x0ffc, /* Nvidia NVS Quadro K1000m Lenovo W530 */
+		0x0def, /* NVidia NVS 5400m Lenovo T430/T530 */
+		0x0dfc, /* NVidia NVS 5200m Lenovo T430s */
+		0x1056, /* NVidia NVS 4200m Lenovo T420/T520 */
+		0x1057, /* NVidia NVS 4200m Lenovo T420/T520 */
+		0x0a6c, /* NVidia NVS 3100m Lenovo T410/T510 */
+		0 };
+
+static const struct pci_driver hybrid_peg_nvidia __pci_driver = {
+	.ops	 = &hybrid_graphics_ops,
+	.vendor	 = PCI_VENDOR_ID_NVIDIA,
+	.devices = pci_device_ids_nvidia,
+};
+
+static const unsigned short pci_device_ids_amd[] = {
+		0x9591, /* ATI Mobility Radeon HD 3650 Lenovo T500/W500 */
+		0x95c4, /* ATI Mobility Radeon HD 3470 Lenovo T400/R400 */
+		0 };
+
+static const struct pci_driver hybrid_peg_amd __pci_driver = {
+	.ops	 = &hybrid_graphics_ops,
+	.vendor	 = PCI_VENDOR_ID_ATI,
+	.devices = pci_device_ids_amd,
+};