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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 <SiYuan.Wang@amd.com>
Signed-off-by: WANG Siyuan <wangsiyuanbuaa@gmail.com>
Reviewed-on: http://review.coreboot.org/3937
Tested-by: build bot (Jenkins)
Reviewed-by: Dave Frodin <dave.frodin@se-eng.com>
This commit is contained in:
WANG Siyuan 2013-09-23 15:12:56 +08:00 committed by Bruce Griffith
parent f38145e81c
commit 2c86fc4343
1 changed files with 7 additions and 0 deletions
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7
src/mainboard/asrock/imb-a180/get_bus_conf.c
View File

@ -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;
memset(bus_yangtze, 0, sizeof(bus_yangtze));