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nb/intel/sandybridge/gma: add disable function

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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>
This commit is contained in:
Patrick Rudolph 2015-10-15 15:35:12 +02:00 • committed by Martin Roth
parent 114a9489ed
commit e11f6c3be1
1 changed files with 14 additions and 0 deletions
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14
src/northbridge/intel/sandybridge/gma.c
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@ -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,
};