[coreboot-gerrit] Patch set updated for coreboot: nb/i945/gma.c: Set the MSAC register correctly

[Arthur Heymans (arthur@aheymans.xyz)]

Arthur Heymans (arthur at aheymans.xyz) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17094

-gerrit

commit 764fb28a6b1c62699821e731c3cde6013f924403
Author: Arthur Heymans <arthur at aheymans.xyz>
Date:   Sat Oct 22 14:16:48 2016 +0200

    nb/i945/gma.c: Set the MSAC register correctly
    
    This fixes an instability on 945gc where the IGD completely locks
    up the system, when for instance tasked to do something with
    compositing (like GNOME or GDM).
    
    TESTED on ga-945gcm-s2l and d945gclf
    TEST: launch GDM (gnome display manager)
    
    Change-Id: Iec49bccf3e3164df9dc1e0b54460a616fe92e04d
    Signed-off-by: Arthur Heymans <arthur at aheymans.xyz>
---
 src/northbridge/intel/i945/gma.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/northbridge/intel/i945/gma.c b/src/northbridge/intel/i945/gma.c
index 4baed80..a0c5864 100644
--- a/src/northbridge/intel/i945/gma.c
+++ b/src/northbridge/intel/i945/gma.c
@@ -32,6 +32,7 @@
 #include "chip.h"
 
 #define GDRST 0xc0
+#define MSAC 0x62 /* Multi Size Aperture Control */
 
 #define  LVDS_CLOCK_A_POWERUP_ALL	(3 << 8)
 #define  LVDS_CLOCK_B_POWERUP_ALL	(3 << 4)
@@ -580,6 +581,7 @@ static int probe_edid(u8 *pmmio, u8 slave)
 
 static void gma_func0_init(struct device *dev)
 {
+	u8 reg8;
 	u32 reg32;
 
 	/* Unconditionally reset graphics */
@@ -594,6 +596,12 @@ static void gma_func0_init(struct device *dev)
 	pci_write_config32(dev, PCI_COMMAND, reg32 | PCI_COMMAND_MASTER
 		 | PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
 
+	/* Set Untrusted Aperture Size to 256mb */
+	reg8 = pci_read_config8(dev, MSAC);
+	reg8 &= ~0x3;
+	reg8 |= 0x2;
+	pci_write_config8(dev, MSAC, reg8);
+
 	if (IS_ENABLED(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT)) {
 		/* PCI Init, will run VBIOS */
 		pci_dev_init(dev);