git.openwrt.org Git - openwrt/staging/neocturne.git/blob

   1 From 05723e71234b60a1a47313ea1a889797ec648f1c Mon Sep 17 00:00:00 2001
   2 From: Chanwoo Choi <cw00.choi@samsung.com>
   3 Date: Tue, 2 Mar 2021 17:22:50 +0900
   4 Subject: [PATCH 3/5] PM / devfreq: passive: Reduce duplicate code when
   5  passive_devfreq case
   6
   7 In order to keep the consistent coding style between passive_devfreq
   8 and passive_cpufreq, use common code for handling required opp property.
   9 Also remove the unneed conditional statement and unify the comment
  10 of both passive_devfreq and passive_cpufreq when getting the target frequency.
  11
  12 Tested-by: Chen-Yu Tsai <wenst@chromium.org>
  13 Tested-by: Johnson Wang <johnson.wang@mediatek.com>
  14 Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
  15 ---
  16  drivers/devfreq/governor_passive.c | 66 ++++--------------------------
  17  1 file changed, 8 insertions(+), 58 deletions(-)
  18
  19 --- a/drivers/devfreq/governor_passive.c
  20 +++ b/drivers/devfreq/governor_passive.c
  21 @@ -93,65 +93,16 @@ static int get_target_freq_with_devfreq(
  22                         = (struct devfreq_passive_data *)devfreq->data;
  23         struct devfreq *parent_devfreq = (struct devfreq *)p_data->parent;
  24         unsigned long child_freq = ULONG_MAX;
  25 -       struct dev_pm_opp *opp, *p_opp;
  26         int i, count;
  27
  28 -       /*
  29 -        * If the devfreq device with passive governor has the specific method
  30 -        * to determine the next frequency, should use the get_target_freq()
  31 -        * of struct devfreq_passive_data.
  32 -        */
  33 -       if (p_data->get_target_freq)
  34 -               return p_data->get_target_freq(devfreq, freq);
  35 -
  36 -       /*
  37 -        * If the parent and passive devfreq device uses the OPP table,
  38 -        * get the next frequency by using the OPP table.
  39 -        */
  40 -
  41 -       /*
  42 -        * - parent devfreq device uses the governors except for passive.
  43 -        * - passive devfreq device uses the passive governor.
  44 -        *
  45 -        * Each devfreq has the OPP table. After deciding the new frequency
  46 -        * from the governor of parent devfreq device, the passive governor
  47 -        * need to get the index of new frequency on OPP table of parent
  48 -        * device. And then the index is used for getting the suitable
  49 -        * new frequency for passive devfreq device.
  50 -        */
  51 -       if (!devfreq->profile || !devfreq->profile->freq_table
  52 -               || devfreq->profile->max_state <= 0)
  53 -               return -EINVAL;
  54 -
  55 -       /*
  56 -        * The passive governor have to get the correct frequency from OPP
  57 -        * list of parent device. Because in this case, *freq is temporary
  58 -        * value which is decided by ondemand governor.
  59 -        */
  60 -       if (devfreq->opp_table && parent_devfreq->opp_table) {
  61 -               p_opp = devfreq_recommended_opp(parent_devfreq->dev.parent,
  62 -                                               freq, 0);
  63 -               if (IS_ERR(p_opp))
  64 -                       return PTR_ERR(p_opp);
  65 -
  66 -               opp = dev_pm_opp_xlate_required_opp(parent_devfreq->opp_table,
  67 -                                                   devfreq->opp_table, p_opp);
  68 -               dev_pm_opp_put(p_opp);
  69 -
  70 -               if (IS_ERR(opp))
  71 -                       goto no_required_opp;
  72 -
  73 -               *freq = dev_pm_opp_get_freq(opp);
  74 -               dev_pm_opp_put(opp);
  75 -
  76 -               return 0;
  77 -       }
  78 +       /* Get target freq via required opps */
  79 +       child_freq = get_target_freq_by_required_opp(parent_devfreq->dev.parent,
  80 +                                               parent_devfreq->opp_table,
  81 +                                               devfreq->opp_table, freq);
  82 +       if (child_freq)
  83 +               goto out;
  84
  85 -no_required_opp:
  86 -       /*
  87 -        * Get the OPP table's index of decided frequency by governor
  88 -        * of parent device.
  89 -        */
  90 +       /* Use interpolation if required opps is not available */
  91         for (i = 0; i < parent_devfreq->profile->max_state; i++)
  92                 if (parent_devfreq->profile->freq_table[i] == *freq)
  93                         break;
  94 @@ -159,7 +110,6 @@ no_required_opp:
  95         if (i == parent_devfreq->profile->max_state)
  96                 return -EINVAL;
  97
  98 -       /* Get the suitable frequency by using index of parent device. */
  99         if (i < devfreq->profile->max_state) {
 100                 child_freq = devfreq->profile->freq_table[i];
 101         } else {
 102 @@ -167,7 +117,7 @@ no_required_opp:
 103                 child_freq = devfreq->profile->freq_table[count - 1];
 104         }
 105
 106 -       /* Return the suitable frequency for passive device. */
 107 +out:
 108         *freq = child_freq;
 109
 110         return 0;