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UPSTREAM: nb/i945/gma.c: Set the MSAC register correctly

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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)

BUG=None
BRANCH=None
TEST=None

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/17094
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins)

Change-Id: Iec49bccf3e3164df9dc1e0b54460a616fe92e04d
Reviewed-on: https://chromium-review.googlesource.com/403839
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Arthur Heymans 2016-10-22 14:16:48 +02:00 • committed by chrome-bot
commit ed80202e0e
1 changed files with 15 additions and 1 deletions
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16
src/northbridge/intel/i945/gma.c
View file

@ -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)
@ -707,12 +708,25 @@ static void gma_ssdt(device_t device)
drivers_intel_gma_displays_ssdt_generate(gfx);
}
static void gma_func0_read_resources(device_t dev)
{
u8 reg8;
/* Set Untrusted Aperture Size to 256mb */
reg8 = pci_read_config8(dev, MSAC);
reg8 &= ~0x3;
reg8 |= 0x2;
pci_write_config8(dev, MSAC, reg8);
pci_dev_read_resources(dev);
}
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_func0_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = gma_func0_init,