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-rw-r--r--src/mainboard/lenovo/t400/cmos.default1
-rw-r--r--src/mainboard/lenovo/t400/cmos.layout8
-rw-r--r--src/mainboard/lenovo/t400/romstage.c143
3 files changed, 151 insertions, 1 deletions
diff --git a/src/mainboard/lenovo/t400/cmos.default b/src/mainboard/lenovo/t400/cmos.default
index ac9f96d73c..98ce970278 100644
--- a/src/mainboard/lenovo/t400/cmos.default
+++ b/src/mainboard/lenovo/t400/cmos.default
@@ -13,3 +13,4 @@ sticky_fn=Disable
power_management_beeps=Enable
low_battery_beep=Enable
sata_mode=AHCI
+hybrid_graphics_mode=Integrated Only \ No newline at end of file
diff --git a/src/mainboard/lenovo/t400/cmos.layout b/src/mainboard/lenovo/t400/cmos.layout
index 686fc25b7e..e9764a568e 100644
--- a/src/mainboard/lenovo/t400/cmos.layout
+++ b/src/mainboard/lenovo/t400/cmos.layout
@@ -80,7 +80,10 @@ entries
# coreboot config options: northbridge
941 3 e 11 gfx_uma_size
-#944 2 r 0 unused
+# coreboot config options: graphics
+944 2 e 12 hybrid_graphics_mode
+
+#946 2 r 0 unused
# coreboot config options: check sums
984 16 h 0 check_sum
@@ -132,6 +135,9 @@ enumerations
11 3 128M
11 5 96M
11 6 160M
+12 0 Integrated Only
+12 1 Discrete Only
+12 2 Switchable
# -----------------------------------------------------------------
checksums
diff --git a/src/mainboard/lenovo/t400/romstage.c b/src/mainboard/lenovo/t400/romstage.c
index 486b738e51..147131ff6c 100644
--- a/src/mainboard/lenovo/t400/romstage.c
+++ b/src/mainboard/lenovo/t400/romstage.c
@@ -1,6 +1,7 @@
/*
* This file is part of the coreboot project.
*
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
* Copyright (C) 2012 secunet Security Networks AG
*
* This program is free software; you can redistribute it and/or
@@ -33,6 +34,118 @@
#define LPC_DEV PCI_DEV(0, 0x1f, 0)
#define MCH_DEV PCI_DEV(0, 0, 0)
+#define HYBRID_GRAPHICS_INTEGRATED_ONLY 0
+#define HYBRID_GRAPHICS_DISCRETE_ONLY 1
+#define HYBRID_GRAPHICS_SWITCHABLE 2
+
+#define HYBRID_GRAPHICS_GP_LVL_BITS 0x004a0000
+#define HYBRID_GRAPHICS_GP_LVL2_BITS 0x00020000
+
+#define HYBRID_GRAPHICS_DETECT_GP_BITS 0x00000010
+
+#define HYBRID_GRAPHICS_INT_CLAIM_VGA 0x2
+#define HYBRID_GRAPHICS_SEC_VGA_EN 0x2
+
+static void hybrid_graphics_configure_switchable_graphics(bool enable)
+{
+ uint32_t tmp;
+
+ if (enable) {
+ /* Disable integrated graphics legacy VGA cycles */
+ tmp = pci_read_config16(MCH_DEV, D0F0_GGC);
+ pci_write_config16(MCH_DEV, D0F0_GGC, tmp | HYBRID_GRAPHICS_INT_CLAIM_VGA);
+
+ /* Enable secondary VGA controller */
+ tmp = pci_read_config16(MCH_DEV, D0F0_DEVEN);
+ pci_write_config16(MCH_DEV, D0F0_DEVEN, tmp | HYBRID_GRAPHICS_SEC_VGA_EN);
+ }
+ else {
+ /* Enable integrated graphics legacy VGA cycles */
+ tmp = pci_read_config16(MCH_DEV, D0F0_GGC);
+ pci_write_config16(MCH_DEV, D0F0_GGC, tmp & ~HYBRID_GRAPHICS_INT_CLAIM_VGA);
+
+ /* Disable secondary VGA controller */
+ tmp = pci_read_config16(MCH_DEV, D0F0_DEVEN);
+ pci_write_config16(MCH_DEV, D0F0_DEVEN, tmp & ~HYBRID_GRAPHICS_SEC_VGA_EN);
+ }
+}
+
+static void hybrid_graphics_set_up_gpio(void)
+{
+ uint32_t tmp;
+
+ /* Enable hybrid graphics GPIO lines */
+ tmp = inl(DEFAULT_GPIOBASE + GP_IO_USE_SEL);
+ tmp = tmp | HYBRID_GRAPHICS_GP_LVL_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_IO_USE_SEL);
+
+ tmp = inl(DEFAULT_GPIOBASE + GP_IO_USE_SEL2);
+ tmp = tmp | HYBRID_GRAPHICS_GP_LVL2_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_IO_USE_SEL2);
+
+ /* Set hybrid graphics control GPIO lines to output */
+ tmp = inl(DEFAULT_GPIOBASE + GP_IO_SEL);
+ tmp = tmp & ~HYBRID_GRAPHICS_GP_LVL_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_IO_SEL);
+
+ tmp = inl(DEFAULT_GPIOBASE + GP_IO_SEL2);
+ tmp = tmp & ~HYBRID_GRAPHICS_GP_LVL2_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_IO_SEL2);
+
+ /* Set hybrid graphics detect GPIO lines to input */
+ tmp = inl(DEFAULT_GPIOBASE + GP_IO_SEL);
+ tmp = tmp | HYBRID_GRAPHICS_DETECT_GP_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_IO_SEL);
+}
+
+static bool hybrid_graphics_installed(void)
+{
+ if (inl(DEFAULT_GPIOBASE + GP_LVL) & HYBRID_GRAPHICS_DETECT_GP_BITS)
+ return false;
+ else
+ return true;
+}
+
+static void hybrid_graphics_switch_to_integrated_graphics(void)
+{
+ uint32_t tmp;
+
+ /* Disable switchable graphics */
+ hybrid_graphics_configure_switchable_graphics(false);
+
+ /* Configure muxes */
+ tmp = inl(DEFAULT_GPIOBASE + GP_LVL);
+ tmp = tmp & ~HYBRID_GRAPHICS_GP_LVL_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_LVL);
+
+ tmp = inl(DEFAULT_GPIOBASE + GP_LVL2);
+ tmp = tmp & ~HYBRID_GRAPHICS_GP_LVL2_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_LVL2);
+}
+
+static void hybrid_graphics_switch_to_discrete_graphics(void)
+{
+ uint32_t tmp;
+
+ /* Disable switchable graphics */
+ hybrid_graphics_configure_switchable_graphics(false);
+
+ /* Configure muxes */
+ tmp = inl(DEFAULT_GPIOBASE + GP_LVL);
+ tmp = tmp | HYBRID_GRAPHICS_GP_LVL_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_LVL);
+
+ tmp = inl(DEFAULT_GPIOBASE + GP_LVL2);
+ tmp = tmp | HYBRID_GRAPHICS_GP_LVL2_BITS;
+ outl(tmp, DEFAULT_GPIOBASE + GP_LVL2);
+}
+
+static void hybrid_graphics_switch_to_dual_graphics(void)
+{
+ /* Enable switchable graphics */
+ hybrid_graphics_configure_switchable_graphics(true);
+}
+
static void default_southbridge_gpio_setup(void)
{
outl(0x197e23fe, DEFAULT_GPIOBASE + GP_IO_USE_SEL);
@@ -94,6 +207,31 @@ void main(unsigned long bist)
default_southbridge_gpio_setup();
+ uint8_t hybrid_graphics_mode = HYBRID_GRAPHICS_INTEGRATED_ONLY;
+ get_option(&hybrid_graphics_mode, "hybrid_graphics_mode");
+
+ /* Set up hybrid graphics */
+ hybrid_graphics_set_up_gpio();
+ if (hybrid_graphics_installed()) {
+ /* Select appropriate hybrid graphics device */
+ printk(BIOS_DEBUG, "Hybrid graphics available, setting mode %d\n", hybrid_graphics_mode);
+ if (hybrid_graphics_mode == HYBRID_GRAPHICS_INTEGRATED_ONLY)
+ hybrid_graphics_switch_to_integrated_graphics();
+ else if (hybrid_graphics_mode == HYBRID_GRAPHICS_DISCRETE_ONLY)
+ hybrid_graphics_switch_to_discrete_graphics();
+ else if (hybrid_graphics_mode == HYBRID_GRAPHICS_SWITCHABLE)
+ hybrid_graphics_switch_to_integrated_graphics();
+ /* Switchable graphics are fully enabled after raminit */
+ /* FIXME
+ * Enabling switchable graphics prevents bootup!
+ * Debug and fix appropriately...
+ */
+ }
+ else {
+ printk(BIOS_DEBUG, "Hybrid graphics not installed\n");
+ hybrid_graphics_switch_to_integrated_graphics();
+ }
+
/* ASPM related setting, set early by original BIOS. */
DMIBAR16(0x204) &= ~(3 << 10);
@@ -173,6 +311,11 @@ void main(unsigned long bist)
outl(inl(DEFAULT_GPIOBASE + 0x38) & ~0x400, DEFAULT_GPIOBASE + 0x38);
cbmem_initted = !cbmem_recovery(s3resume);
+
+ if (hybrid_graphics_installed())
+ if (hybrid_graphics_mode == HYBRID_GRAPHICS_SWITCHABLE)
+ hybrid_graphics_switch_to_dual_graphics();
+
#if CONFIG_HAVE_ACPI_RESUME
/* If there is no high memory area, we didn't boot before, so
* this is not a resume. In that case we just create the cbmem toc.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 05:13:33 +0000