Siyuan Wang (wangsiyuanbuaa@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3934
-gerrit
commit 2605d98575e1e90ac4b2797bc90ec9adffceab4a Author: WANG Siyuan wangsiyuanbuaa@gmail.com Date: Sun Sep 22 15:20:37 2013 +0800
AMD Olive Hill: Disable NoSnoopEnable to fix HDMI audio corruptions with Ubuntu
Ubuntu's HDMI audio has noise and echo. Disable NoSnoopEnable can resolve this issue. I have tested on Ubuntu 13.04 with AMD Catalyst 13.4 Proprietary Linux Display Driver[1].
[1]. http://support.amd.com/us/gpudownload/linux/Pages/radeon_linux.aspx
Change-Id: I5d2dddb1b7469d56cd64e3c1e0f4c6c6f095b4ab Signed-off-by: WANG Siyuan SiYuan.Wang@amd.com Signed-off-by: WANG Siyuan wangsiyuanbuaa@gmail.com --- src/mainboard/amd/olivehill/get_bus_conf.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/src/mainboard/amd/olivehill/get_bus_conf.c b/src/mainboard/amd/olivehill/get_bus_conf.c index 0d379d5..892471a 100644 --- a/src/mainboard/amd/olivehill/get_bus_conf.c +++ b/src/mainboard/amd/olivehill/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++) {