Timothy Pearson (tpearson@raptorengineeringinc.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/10142
-gerrit
commit a137a1e4f934e97dc729ab73e8848205ae32f7ee Author: Timothy Pearson tpearson@raptorengineeringinc.com Date: Fri May 8 00:32:47 2015 -0500
cpu/amd/model_10xxx: Add missing ACPI _PSD object
The ACPI power state generator for AMD 10xxx CPUs did not generate the _PSD object required for reliable PowerNow! operation. Without a correct _PSD object PowerNow! does not know the required core clock relationships, potentially causing unstable system operation.
Generate the _PSD object in accordance with the BKDG Rev. 3.62.
Change-Id: I255a4837ab29ff1b0874daf189ffb61798645795 Signed-off-by: Timothy Pearson tpearson@raptorengineeringinc.com --- src/cpu/amd/model_10xxx/powernow_acpi.c | 38 +++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-)
diff --git a/src/cpu/amd/model_10xxx/powernow_acpi.c b/src/cpu/amd/model_10xxx/powernow_acpi.c index bf97099..6c8ed9d 100644 --- a/src/cpu/amd/model_10xxx/powernow_acpi.c +++ b/src/cpu/amd/model_10xxx/powernow_acpi.c @@ -37,9 +37,11 @@ static void write_pstates_for_core(u8 pstate_num, u16 *pstate_feq, u32 *pstate_power, u32 *pstate_latency, u32 *pstate_control, u32 *pstate_status, int coreID, - u32 pcontrol_blk, u8 plen, u8 onlyBSP) + u32 pcontrol_blk, u8 plen, u8 onlyBSP, + uint8_t single_link) { int i; + struct cpuid_result cpuid1;
if ((onlyBSP) && (coreID != 0)) { plen = 0; @@ -64,7 +66,34 @@ static void write_pstates_for_core(u8 pstate_num, u16 *pstate_feq, u32 *pstate_p /* update the package size */ acpigen_pop_len();
+ /* Write PPC object */ acpigen_write_PPC(pstate_num); + + /* Write PSD indicating coordination type */ + if ((single_link) && (mctGetLogicalCPUID(0) & AMD_DR_GT_Bx)) { + /* Revision C or greater single-link processor */ + cpuid1 = cpuid(0x80000008); + acpigen_write_PSD_package(0, (cpuid1.ecx & 0xff) + 1, SW_ALL); + } + else { + /* Find the local APIC ID for the specified core ID */ + struct device* cpu; + int cpu_index = 0; + for (cpu = all_devices; cpu; cpu = cpu->next) { + if ((cpu->path.type != DEVICE_PATH_APIC) || + (cpu->bus->dev->path.type != DEVICE_PATH_CPU_CLUSTER)) + continue; + if (!cpu->enabled) + continue; + if (cpu_index == coreID) + break; + cpu_index++; + } + + if (cpu) + acpigen_write_PSD_package(cpu->path.apic.apic_id, 1, SW_ANY); + } + /* patch the whole Processor token length */ acpigen_pop_len(); } @@ -160,6 +189,11 @@ void amd_generate_powernow(u32 pcontrol_blk, u8 plen, u8 onlyBSP) uint32_t core_power; uint32_t core_latency; uint32_t core_voltage; /* multiplied by 10000 */ + uint8_t single_link; + + /* Determine if this is a single-link system */ + dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 0)), 0x80); + single_link = !!(((dtemp & 0xff00) >> 8) == 0);
/* Determine if this is a PVI or SVI system */ dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 3)), 0xA0); @@ -266,6 +300,6 @@ void amd_generate_powernow(u32 pcontrol_blk, u8 plen, u8 onlyBSP) for (index = 0; index < cmp_cap; index++) write_pstates_for_core(Pstate_num, Pstate_feq, Pstate_power, Pstate_latency, Pstate_control, Pstate_status, - index, pcontrol_blk, plen, onlyBSP); + index, pcontrol_blk, plen, onlyBSP, single_link); acpigen_pop_len(); }