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-rw-r--r--src/northbridge/amd/amdfam10/misc_control.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/src/northbridge/amd/amdfam10/misc_control.c b/src/northbridge/amd/amdfam10/misc_control.c
index 24c422d67e..847b599b33 100644
--- a/src/northbridge/amd/amdfam10/misc_control.c
+++ b/src/northbridge/amd/amdfam10/misc_control.c
@@ -120,16 +120,32 @@ static void mcf3_set_resources(device_t dev)
static void misc_control_init(struct device *dev)
{
- u32 cmd;
+ uint32_t dword;
+ uint8_t nvram;
+ uint8_t boost_limit;
+ uint8_t current_boost;
printk(BIOS_DEBUG, "NB: Function 3 Misc Control.. ");
/* Disable Machine checks from Invalid Locations.
* This is needed for PC backwards compatibility.
*/
- cmd = pci_read_config32(dev, 0x44);
- cmd |= (1<<6) | (1<<25);
- pci_write_config32(dev, 0x44, cmd );
+ dword = pci_read_config32(dev, 0x44);
+ dword |= (1<<6) | (1<<25);
+ pci_write_config32(dev, 0x44, dword);
+
+ boost_limit = 0xf;
+ if (get_option(&nvram, "maximum_p_state_limit") == CB_SUCCESS)
+ boost_limit = nvram & 0xf;
+
+ /* Set P-state maximum value */
+ dword = pci_read_config32(dev, 0xdc);
+ current_boost = (dword >> 8) & 0x7;
+ if (boost_limit > current_boost)
+ boost_limit = current_boost;
+ dword &= ~(0x7 << 8);
+ dword |= (boost_limit & 0x7) << 8;
+ pci_write_config32(dev, 0xdc, dword);
printk(BIOS_DEBUG, "done.\n");
}