i945: Disable IGD if plugin VGA is preferred

It's shut down, but UMA memory is not reclaimed. A later extension
could optionally do the magic register dance that allows initialization
of IGD as secondary graphics device.

Change-Id: I2a92bb71755005b886a8e1825325c678a9991bf2
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1252
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Patrick Georgi 2012-07-20 12:37:06 +02:00 committed by Patrick Georgi
parent a555e55d15
commit ce6e9fed2e
1 changed files with 18 additions and 0 deletions

View File

@ -23,6 +23,7 @@
#include <device/pci.h>
#include <device/pci_ids.h>
#include <pc80/mc146818rtc.h>
#include "i945.h"
#define GDRST 0xc0
@ -44,6 +45,22 @@ static void gma_func0_init(struct device *dev)
pci_dev_init(dev);
}
/* This doesn't reclaim stolen UMA memory, but IGD could still
be reenabled later. */
static void gma_func0_disable(struct device *dev)
{
struct device *dev_host = dev_find_slot(0, PCI_DEVFN(0x0, 0));
pci_write_config16(dev, GCFC, 0xa00);
pci_write_config16(dev_host, GGC, (1 << 1));
unsigned int reg32 = pci_read_config32(dev_host, DEVEN);
reg32 &= ~(DEVEN_D2F0 | DEVEN_D2F1);
pci_write_config32(dev_host, DEVEN, reg32);
dev->enabled = 0;
}
static void gma_func1_init(struct device *dev)
{
u32 reg32;
@ -82,6 +99,7 @@ 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,
};