diff options
Diffstat (limited to 'src/southbridge/amd/sb700/early_setup.c')
| -rw-r--r-- | src/southbridge/amd/sb700/early_setup.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/src/southbridge/amd/sb700/early_setup.c b/src/southbridge/amd/sb700/early_setup.c index 57fda78077..f109896ea3 100644 --- a/src/southbridge/amd/sb700/early_setup.c +++ b/src/southbridge/amd/sb700/early_setup.c @@ -268,10 +268,6 @@ void enable_fid_change_on_sb(u32 sbbusn, u32 sbdn) byte &= ~(1<<6); pmio_write(0x8d, byte); - byte = pmio_read(0x61); - byte &= ~0x04; - pmio_write(0x61, byte); - byte = pmio_read(0x42); byte &= ~0x04; pmio_write(0x42, byte); @@ -583,6 +579,13 @@ static void sb700_devices_por_init(void) static void sb700_pmio_por_init(void) { u8 byte; + uint8_t enable_c_states; + + enable_c_states = 0; +#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES) + if (get_option(&byte, "cpu_c_states") == CB_SUCCESS) + enable_c_states = !!byte; +#endif printk(BIOS_INFO, "sb700_pmio_por_init()\n"); /* K8KbRstEn, KB_RST# control for K8 system. */ @@ -644,6 +647,14 @@ static void sb700_pmio_por_init(void) byte |= 1 << 0; pmio_write(0xB2, byte); + /* Set up IOAPIC and BM_STS monitoring */ + byte = pmio_read(0x61); + if (enable_c_states) + byte |= 0x4; + else + byte &= ~0x04; + pmio_write(0x61, byte); + /* NOTE: Enabling automatic C1e state switch caused failures when initializing processors */ /* Enable precision HPET clock and automatic C state switch */ |