ACPI: Add fixups for AMD P-state figures
Some AMD systems may round the frequencies in ACPI tables to 100MHz boundaries. We can obtain the real frequencies from MSRs, so add a quirk to fix these frequencies up on AMD systems. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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@ -248,6 +248,7 @@
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#define MSR_IA32_PERF_STATUS 0x00000198
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#define MSR_IA32_PERF_STATUS 0x00000198
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#define MSR_IA32_PERF_CTL 0x00000199
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#define MSR_IA32_PERF_CTL 0x00000199
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#define MSR_AMD_PSTATE_DEF_BASE 0xc0010064
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#define MSR_AMD_PERF_STATUS 0xc0010063
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#define MSR_AMD_PERF_STATUS 0xc0010063
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#define MSR_AMD_PERF_CTL 0xc0010062
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#define MSR_AMD_PERF_CTL 0xc0010062
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@ -324,6 +324,34 @@ static int acpi_processor_get_performance_control(struct acpi_processor *pr)
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return result;
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return result;
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}
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}
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#ifdef CONFIG_X86
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/*
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* Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
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* in their ACPI data. Calculate the real values and fix up the _PSS data.
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*/
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static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
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{
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u32 hi, lo, fid, did;
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int index = px->control & 0x00000007;
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if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
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return;
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if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
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|| boot_cpu_data.x86 == 0x11) {
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rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
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fid = lo & 0x3f;
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did = (lo >> 6) & 7;
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if (boot_cpu_data.x86 == 0x10)
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px->core_frequency = (100 * (fid + 0x10)) >> did;
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else
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px->core_frequency = (100 * (fid + 8)) >> did;
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}
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}
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#else
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static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
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#endif
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static int acpi_processor_get_performance_states(struct acpi_processor *pr)
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static int acpi_processor_get_performance_states(struct acpi_processor *pr)
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{
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{
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int result = 0;
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int result = 0;
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@ -379,6 +407,8 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr)
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goto end;
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goto end;
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}
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}
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amd_fixup_frequency(px, i);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
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"State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
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i,
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i,
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