New patch to review for coreboot: nb/x4x/gma.c: Add disable function.

[Arthur Heymans]

Arthur Heymans ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/18504

-gerrit

commit bb2a6fe97daba58971b6e02fdb956b552fbd2384
Author: Arthur Heymans 
Date:   Sun Feb 26 23:04:51 2017 +0100

nb/x4x/gma.c: Add disable function.

This should allow set_vga_bridge_bits() in device.c to disable the
    integrated GPU when an external GPU is detected.

UNTESTED

Change-Id: I74890918feb0f1ff6b971c4aaa96f1f7b75266ac
    Signed-off-by: Arthur Heymans 
---
 src/northbridge/intel/x4x/gma.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/northbridge/intel/x4x/gma.c b/src/northbridge/intel/x4x/gma.c
index 74250fe..0d41afe 100644
--- a/src/northbridge/intel/x4x/gma.c
+++ b/src/northbridge/intel/x4x/gma.c
@@ -376,6 +376,19 @@ static void gma_func0_init(struct device *dev)
    	pci_dev_init(dev);
 }

+static void gma_func0_disable(struct device *dev)
+{
+	struct device *dev_host = dev_find_slot(0, PCI_DEVFN(0x0, 0));
+
+	pci_write_config16(dev_host, D0F0_GGC, (1 << 1));
+
+	unsigned int reg32 = pci_read_config32(dev_host, D0F0_DEVEN);
+	reg32 &= ~(IGD0EN | IGD1EN);
+	pci_write_config32(dev_host, D0F0_DEVEN, reg32);
+
+	dev->enabled = 0;
+}
+
 static void gma_set_subsystem(device_t dev, unsigned vendor, unsigned device)
 {
    if (!vendor || !device) {
@@ -420,6 +433,7 @@ static struct device_operations gma_func0_ops = {
    .acpi_fill_ssdt_generator = gma_ssdt,
    .init = gma_func0_init,
    .ops_pci = &gma_pci_ops,
+	.disable = gma_func0_disable,
 };

static const unsigned short pci_device_ids[] =