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    Subject[PATCH 3.11 018/121] intel_pstate: Correct calculation of min pstate value
    Date
    3.11.10.5 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Dirk Brandewie <dirk.j.brandewie@intel.com>

    commit 7244cb62d96e735847dc9d08f870550df896898c upstream.

    The minimum pstate is supposed to be a percentage of the maximum P
    state available. Calculate min using max pstate and not the
    current max which may have been limited by the user

    Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Cc: Zhang, Xiong Y <xiong.y.zhang@intel.com>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    drivers/cpufreq/intel_pstate.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
    index 50392ac..e52e542 100644
    --- a/drivers/cpufreq/intel_pstate.c
    +++ b/drivers/cpufreq/intel_pstate.c
    @@ -366,12 +366,13 @@ static int intel_pstate_turbo_pstate(void)
    static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
    {
    int max_perf = cpu->pstate.turbo_pstate;
    + int max_perf_adj;
    int min_perf;
    if (limits.no_turbo)
    max_perf = cpu->pstate.max_pstate;

    - max_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf));
    - *max = clamp_t(int, max_perf,
    + max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf));
    + *max = clamp_t(int, max_perf_adj,
    cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);

    min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf));
    --
    1.9.0


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