[U-Boot] [PATCH 15/22] x86: ivybridge: Set up an MTRR for the video frame buffer

[Simon Glass]

Set the frame buffer to write-combining. This makes it faster, although for
scrolling write-through is even faster for U-Boot.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 arch/x86/cpu/ivybridge/gma.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/cpu/ivybridge/gma.c b/arch/x86/cpu/ivybridge/gma.c
index 125021b..03b2ebd 100644
--- a/arch/x86/cpu/ivybridge/gma.c
+++ b/arch/x86/cpu/ivybridge/gma.c
@@ -12,6 +12,7 @@
 #include <fdtdec.h>
 #include <pci_rom.h>
 #include <asm/io.h>
+#include <asm/mtrr.h>
 #include <asm/pci.h>
 #include <asm/arch/pch.h>
 #include <asm/arch/sandybridge.h>
@@ -738,6 +739,8 @@ int gma_func0_init(pci_dev_t dev, struct pci_controller *hose,
 		   const void *blob, int node)
 {
 	void *gtt_bar;
+	ulong start;
+	ulong base;
 	u32 reg32;
 	int ret;
 
@@ -746,6 +749,11 @@ int gma_func0_init(pci_dev_t dev, struct pci_controller *hose,
 	reg32 |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
 	pci_write_config32(dev, PCI_COMMAND, reg32);
 
+	/* Use write-combining for the graphics memory, 256MB */
+	base = pci_read_bar32(hose, dev, 2);
+	mtrr_add_request(MTRR_TYPE_WRCOMB, base, 256 << 20);
+	mtrr_commit(true);
+
 	gtt_bar = (void *)pci_read_bar32(pci_bus_to_hose(0), dev, 0);
 	debug("GT bar %p\n", gtt_bar);
 	ret = gma_pm_init_pre_vbios(gtt_bar);
-- 
2.2.0.rc0.207.ga3a616c