New patch to review for coreboot: 42026b6 ASRock IMB_A180: fix Ubuntu HDMI audio issue

[Siyuan Wang]

Siyuan Wang ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3937

-gerrit

commit 42026b6b4f9ab2a642e482ef21ff38f4061a94e6
Author: WANG Siyuan 
Date:   Mon Sep 23 15:12:56 2013 +0800

ASRock IMB_A180: fix Ubuntu HDMI audio issue

Ubuntu's HDMI audio has noise and echo. Disable NoSnoopEnable can
    resolve this issue.
    I have tested on Ubuntu 13.04 with latest graphic driver.

Change-Id: I09c19b8925eedee03cfb1d8c0831a84e8aeeba4f
    Signed-off-by: WANG Siyuan 
    Signed-off-by: WANG Siyuan 
---
 src/mainboard/asrock/imb-a180/get_bus_conf.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/mainboard/asrock/imb-a180/get_bus_conf.c b/src/mainboard/asrock/imb-a180/get_bus_conf.c
index 0d379d5..892471a 100644
--- a/src/mainboard/asrock/imb-a180/get_bus_conf.c
+++ b/src/mainboard/asrock/imb-a180/get_bus_conf.c
@@ -54,6 +54,7 @@ void get_bus_conf(void)
 {
    u32 apicid_base;
    u32 status;
+	u32 value;

device_t dev;
    int i, j;
@@ -98,6 +99,12 @@ void get_bus_conf(void)
    pci_write_config32(dev, 0xF8, 0);
    pci_write_config32(dev, 0xFC, 5); /* TODO: move it to dsdt.asl */

+	/* disable No Snoop */
+	dev = dev_find_slot(0, PCI_DEVFN(1, 1));
+	value = pci_read_config32(dev, 0x60);
+	value &= ~(1 << 11);
+	pci_write_config32(dev, 0x60, value);
+
    sbdn_yangtze = 0;

for (i = 0; i < 3; i++) {