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    Subject[PATCH 3/6] cpufreq: Add roll back non-sampling_window
    Date

    When sampling window is set to default sampling rate, the sampling window will
    roll back to orignal behaviour. The up_threshold and down_differential also set
    to original ones.


    Signed-off-by: Youquan Song <youquan.song@intel.com>
    ---
    drivers/cpufreq/cpufreq_ondemand.c | 20 +++++++++++++++++---
    1 files changed, 17 insertions(+), 3 deletions(-)

    diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
    index 87aec7f..5242d24 100644
    --- a/drivers/cpufreq/cpufreq_ondemand.c
    +++ b/drivers/cpufreq/cpufreq_ondemand.c
    @@ -469,11 +469,24 @@ static ssize_t store_sampling_window(struct kobject *a, struct attribute *b,
    if (input > 1000000)
    input = 1000000;

    - if (input < 10000)
    - input = 10000;
    + if (input < dbs_tuners_ins.sampling_rate)
    + input = dbs_tuners_ins.sampling_rate;

    mutex_lock(&dbs_mutex);
    dbs_tuners_ins.sampling_window = input;
    + /* User set sampling window equal default sampling rate,
    + * It means that user want disable sampling window, so
    + * return to legacy sampling mode
    + * */
    + if (input == dbs_tuners_ins.sampling_rate) {
    + dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
    + dbs_tuners_ins.down_differential =
    + MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
    + } else {
    + dbs_tuners_ins.up_threshold = SAMPLING_WINDOW_UP_THRESHOLD;
    + dbs_tuners_ins.down_differential =
    + SAMPLING_WINDOW_DOWN_DIFFERENTIAL;
    + }
    mutex_unlock(&dbs_mutex);

    return count;
    @@ -720,7 +733,8 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
    }
    }

    - if (sampling_window_enable)
    + if (sampling_window_enable && (dbs_tuners_ins.sampling_window !=
    + dbs_tuners_ins.sampling_rate))
    /* Get the average load in the lastest sampling window */
    max_load_freq = get_load_freq_during_sampling_window(
    this_dbs_info, max_load_freq,
    --
    1.6.4.2


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