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| author | Patrick Rudolph <siro@das-labor.org> | 2015-10-15 15:35:12 +0200 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2015-10-29 17:08:48 +0100 |
| commit | e11f6c3be168b1efde7fa1b5fd8754b9b8057dc9 (patch) | |
| tree | 9f33dc619e1717f95f51cc00c72bea954929011d /src/northbridge/intel | |
| parent | 114a9489ed688403e202ada5eb22fc171a769594 (diff) | |
| download | coreboot-e11f6c3be168b1efde7fa1b5fd8754b9b8057dc9.tar.xz | |
nb/intel/sandybridge/gma: add disable function
Issue observed:
In a multi GPU setup (IGD and PEG) the system still uses the IGD.
CONFIG_ONBOARD_VGA_IS_PRIMARY has no effect on Sandy/Ivy Bridge.
Test system:
* Gigabyte GA-B75M-D3H
* Intel Pentium CPU G2130
* ATI Radeon HD4780
Problem description:
The GMA is missing a disable function.
Problem solution:
Add a GMA disable function. Deactivate PCI device until remaining multi
GPU issues are resolved. Do not claim VGA decode any more.
Final testing results:
The system is able to boot using the PEG device as primary VGA
device.
Change-Id: I52af32df41ca22f808b119f3a4099849c74068b3
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: http://review.coreboot.org/11919
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/northbridge/intel')
| -rw-r--r-- | src/northbridge/intel/sandybridge/gma.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/northbridge/intel/sandybridge/gma.c b/src/northbridge/intel/sandybridge/gma.c index d1779db8da..bf340e9f61 100644 --- a/src/northbridge/intel/sandybridge/gma.c +++ b/src/northbridge/intel/sandybridge/gma.c @@ -634,6 +634,19 @@ static void gma_ssdt(device_t device) drivers_intel_gma_displays_ssdt_generate(gfx); } +/* called by pci set_vga_bridge function */ +static void gma_func0_disable(struct device *dev) +{ + u16 reg16; + device_t dev_host = dev_find_slot(0, PCI_DEVFN(0,0)); + + reg16 = pci_read_config16(dev_host, GGC); + reg16 |= (1 << 1); /* disable VGA decode */ + pci_write_config16(dev_host, GGC, reg16); + + dev->enabled = 0; +} + static struct pci_operations gma_pci_ops = { .set_subsystem = gma_set_subsystem, }; @@ -646,6 +659,7 @@ static struct device_operations gma_func0_ops = { .init = gma_func0_init, .scan_bus = 0, .enable = 0, + .disable = gma_func0_disable, .ops_pci = &gma_pci_ops, }; |