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authorHuang Rui <ray.huang@amd.com>2021-04-25 15:34:51 +0800
committerIngo Molnar <mingo@kernel.org>2021-05-13 12:10:24 +0200
commit3743d55b289c203d8f77b7cd47c24926b9d186ae (patch)
tree8a9f28d591c88bc7a014d2464096409237a0867e /drivers/cpufreq/acpi-cpufreq.c
parent02dbb7246c5bbbbe1607ebdc546ba5c454a664b1 (diff)
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x86, sched: Fix the AMD CPPC maximum performance value on certain AMD Ryzen generations
Some AMD Ryzen generations has different calculation method on maximum performance. 255 is not for all ASICs, some specific generations should use 166 as the maximum performance. Otherwise, it will report incorrect frequency value like below: ~ → lscpu | grep MHz CPU MHz: 3400.000 CPU max MHz: 7228.3198 CPU min MHz: 2200.0000 [ mingo: Tidied up whitespace use. ] [ Alexander Monakov <amonakov@ispras.ru>: fix 225 -> 255 typo. ] Fixes: 41ea667227ba ("x86, sched: Calculate frequency invariance for AMD systems") Fixes: 3c55e94c0ade ("cpufreq: ACPI: Extend frequency tables to cover boost frequencies") Reported-by: Jason Bagavatsingham <jason.bagavatsingham@gmail.com> Fixed-by: Alexander Monakov <amonakov@ispras.ru> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Jason Bagavatsingham <jason.bagavatsingham@gmail.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210425073451.2557394-1-ray.huang@amd.com Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=211791 Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/cpufreq/acpi-cpufreq.c')
-rw-r--r--drivers/cpufreq/acpi-cpufreq.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index d1bbc16fba4b..7e7450453714 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -646,7 +646,11 @@ static u64 get_max_boost_ratio(unsigned int cpu)
return 0;
}
- highest_perf = perf_caps.highest_perf;
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ highest_perf = amd_get_highest_perf();
+ else
+ highest_perf = perf_caps.highest_perf;
+
nominal_perf = perf_caps.nominal_perf;
if (!highest_perf || !nominal_perf) {