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>
diff --git a/src/northbridge/intel/i945/gma.c b/src/northbridge/intel/i945/gma.c
index b703a80..bf381b8 100644
--- a/src/northbridge/intel/i945/gma.c
+++ b/src/northbridge/intel/i945/gma.c
@@ -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 @@
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 @@
.init = gma_func0_init,
.scan_bus = 0,
.enable = 0,
+ .disable = gma_func0_disable,
.ops_pci = &gma_pci_ops,
};