x86: ivybridge: Set up an MTRR for the video frame buffer

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@chromium.org>

diff --git a/arch/x86/cpu/ivybridge/gma.c b/arch/x86/cpu/ivybridge/gma.c
index cf4f87c..6cf9654 100644 (file)
--- 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>
@@ -735,6 +736,7 @@ int gma_func0_init(pci_dev_t dev, struct pci_controller *hose,
        ulong start;
 #endif
        void *gtt_bar;
+       ulong base;
        u32 reg32;
        int ret;
 
@@ -743,6 +745,11 @@ 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);