New patch to review for coreboot: 14dc66b haswell: mark graphics memory write-combining.

[Aaron Durbin]

Aaron Durbin ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2893

-gerrit

commit 14dc66b92c7b8bc3d959ada57ba5fa5b937603da
Author: Aaron Durbin 
Date:   Fri Mar 22 22:23:05 2013 -0500

haswell: mark graphics memory write-combining.

The graphics memory can be accessed in a faster manner by
    setting it to write-combing mode.

Change-Id: I797fcd9f0dfb074f9e45476773acbfe614eb4b0a
    Signed-off-by: Aaron Durbin 
---
 src/northbridge/intel/haswell/gma.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/northbridge/intel/haswell/gma.c b/src/northbridge/intel/haswell/gma.c
index d085066..f7b0ab9 100644
--- a/src/northbridge/intel/haswell/gma.c
+++ b/src/northbridge/intel/haswell/gma.c
@@ -217,12 +217,27 @@ static void gma_set_subsystem(device_t dev, unsigned vendor, unsigned device)
    }
 }

+static void gma_read_resources(struct device *dev)
+{
+	struct resource *res;
+
+	pci_dev_read_resources(dev);
+
+	/* Set the graphics memory to write combining. */
+	res = find_resource(dev, PCI_BASE_ADDRESS_2);
+	if (res == NULL) {
+		printk(BIOS_DEBUG, "gma: memory resource not found.\n");
+		return;
+	}
+	res->flags |= IORESOURCE_WRCOMB;
+}
+
 static struct pci_operations gma_pci_ops = {
    .set_subsystem    = gma_set_subsystem,
 };

static struct device_operations gma_func0_ops = {
-	.read_resources		= pci_dev_read_resources,
+	.read_resources		= gma_read_resources,
    .set_resources		= pci_dev_set_resources,
    .enable_resources	= pci_dev_enable_resources,
    .init			= gma_func0_init,