target/linux/ipq806x/patches-4.19/0052-PM-OPP-Update-the-voltage-tolerance-when-adjusting-t.patch

   1 From 4533c285c2aedce6d4434d7b877066de3b1ecb33 Mon Sep 17 00:00:00 2001
   2 From: Georgi Djakov <georgi.djakov@linaro.org>
   3 Date: Thu, 25 Aug 2016 18:43:35 +0300
   4 Subject: [PATCH 52/69] PM / OPP: Update the voltage tolerance when adjusting
   5  the OPP
   6
   7 When the voltage is adjusted, the voltage tolerance is not updated.
   8 This can lead to situations where the voltage min value is greater
   9 than the voltage max value. The final result is triggering a BUG()
  10 in the regulator core.
  11 Fix this by updating the voltage tolerance values too.
  12
  13 Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
  14 ---
  15  drivers/opp/core.c | 5 +++++
  16  1 file changed, 5 insertions(+)
  17
  18 --- a/drivers/opp/core.c
  19 +++ b/drivers/opp/core.c
  20 @@ -1669,6 +1669,7 @@ int dev_pm_opp_adjust_voltage(struct dev
  21         struct opp_table *opp_table;
  22         struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
  23         int r = 0;
  24 +       unsigned long tol;
  25
  26         /* Find the opp_table */
  27         opp_table = _find_opp_table(dev);
  28 @@ -1698,8 +1699,17 @@ int dev_pm_opp_adjust_voltage(struct dev
  29                 goto adjust_unlock;
  30
  31         opp->supplies->u_volt = u_volt;
  32 -       opp->supplies->u_volt_min = u_volt_min;
  33 -       opp->supplies->u_volt_max = u_volt_max;
  34 +
  35 +       tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
  36 +       if ( u_volt_min == u_volt )
  37 +               opp->supplies->u_volt_min = u_volt - tol;
  38 +       else
  39 +               opp->supplies->u_volt_min = u_volt_min;
  40 +
  41 +       if ( u_volt_max == u_volt )
  42 +               opp->supplies->u_volt_max = u_volt + tol;
  43 +       else
  44 +               opp->supplies->u_volt_max = u_volt_max;
  45
  46         dev_pm_opp_get(opp);
  47         mutex_unlock(&opp_table->lock);