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

   1 From d4dd09968cab3249e6148e1c3fccb51824edb411 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?N=C3=ADcolas=20F=2E=20R=2E=20A=2E=20Prado?=
   3  <nfraprado@collabora.com>
   4 Date: Thu, 6 Jul 2023 11:37:37 -0400
   5 Subject: [PATCH 30/42] thermal/drivers/mediatek/lvts_thermal: Manage threshold
   6  between sensors
   7 MIME-Version: 1.0
   8 Content-Type: text/plain; charset=UTF-8
   9 Content-Transfer-Encoding: 8bit
  10
  11 Each LVTS thermal controller can have up to four sensors, each capable
  12 of triggering its own interrupt when its measured temperature crosses
  13 the configured threshold. The threshold for each sensor is handled
  14 separately by the thermal framework, since each one is registered with
  15 its own thermal zone and trips. However, the temperature thresholds are
  16 configured on the controller, and therefore are shared between all
  17 sensors on that controller.
  18
  19 When the temperature measured by the sensors is different enough to
  20 cause the thermal framework to configure different thresholds for each
  21 one, interrupts start triggering on sensors outside the last threshold
  22 configured.
  23
  24 To address the issue, track the thresholds required by each sensor and
  25 only actually set the highest one in the hardware, and disable
  26 interrupts for all sensors outside the current configured range.
  27
  28 Fixes: f5f633b18234 ("thermal/drivers/mediatek: Add the Low Voltage Thermal Sensor driver")
  29 Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
  30 Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
  31 Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
  32 Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
  33 Link: https://lore.kernel.org/r/20230706153823.201943-7-nfraprado@collabora.com
  34 ---
  35  drivers/thermal/mediatek/lvts_thermal.c | 69 +++++++++++++++++++++++++
  36  1 file changed, 69 insertions(+)
  37
  38 --- a/drivers/thermal/mediatek/lvts_thermal.c
  39 +++ b/drivers/thermal/mediatek/lvts_thermal.c
  40 @@ -67,6 +67,11 @@
  41  #define LVTS_CALSCALE_CONF                     0x300
  42  #define LVTS_MONINT_CONF                       0x8300318C
  43
  44 +#define LVTS_MONINT_OFFSET_SENSOR0             0xC
  45 +#define LVTS_MONINT_OFFSET_SENSOR1             0x180
  46 +#define LVTS_MONINT_OFFSET_SENSOR2             0x3000
  47 +#define LVTS_MONINT_OFFSET_SENSOR3             0x3000000
  48 +
  49  #define LVTS_INT_SENSOR0                       0x0009001F
  50  #define LVTS_INT_SENSOR1                       0x001203E0
  51  #define LVTS_INT_SENSOR2                       0x00247C00
  52 @@ -112,6 +117,8 @@ struct lvts_sensor {
  53         void __iomem *base;
  54         int id;
  55         int dt_id;
  56 +       int low_thresh;
  57 +       int high_thresh;
  58  };
  59
  60  struct lvts_ctrl {
  61 @@ -121,6 +128,8 @@ struct lvts_ctrl {
  62         int num_lvts_sensor;
  63         int mode;
  64         void __iomem *base;
  65 +       int low_thresh;
  66 +       int high_thresh;
  67  };
  68
  69  struct lvts_domain {
  70 @@ -292,12 +301,66 @@ static int lvts_get_temp(struct thermal_
  71         return 0;
  72  }
  73
  74 +static void lvts_update_irq_mask(struct lvts_ctrl *lvts_ctrl)
  75 +{
  76 +       u32 masks[] = {
  77 +               LVTS_MONINT_OFFSET_SENSOR0,
  78 +               LVTS_MONINT_OFFSET_SENSOR1,
  79 +               LVTS_MONINT_OFFSET_SENSOR2,
  80 +               LVTS_MONINT_OFFSET_SENSOR3,
  81 +       };
  82 +       u32 value = 0;
  83 +       int i;
  84 +
  85 +       value = readl(LVTS_MONINT(lvts_ctrl->base));
  86 +
  87 +       for (i = 0; i < ARRAY_SIZE(masks); i++) {
  88 +               if (lvts_ctrl->sensors[i].high_thresh == lvts_ctrl->high_thresh
  89 +                   && lvts_ctrl->sensors[i].low_thresh == lvts_ctrl->low_thresh)
  90 +                       value |= masks[i];
  91 +               else
  92 +                       value &= ~masks[i];
  93 +       }
  94 +
  95 +       writel(value, LVTS_MONINT(lvts_ctrl->base));
  96 +}
  97 +
  98 +static bool lvts_should_update_thresh(struct lvts_ctrl *lvts_ctrl, int high)
  99 +{
 100 +       int i;
 101 +
 102 +       if (high > lvts_ctrl->high_thresh)
 103 +               return true;
 104 +
 105 +       for (i = 0; i < lvts_ctrl->num_lvts_sensor; i++)
 106 +               if (lvts_ctrl->sensors[i].high_thresh == lvts_ctrl->high_thresh
 107 +                   && lvts_ctrl->sensors[i].low_thresh == lvts_ctrl->low_thresh)
 108 +                       return false;
 109 +
 110 +       return true;
 111 +}
 112 +
 113  static int lvts_set_trips(struct thermal_zone_device *tz, int low, int high)
 114  {
 115         struct lvts_sensor *lvts_sensor = thermal_zone_device_priv(tz);
 116 +       struct lvts_ctrl *lvts_ctrl = container_of(lvts_sensor, struct lvts_ctrl, sensors[lvts_sensor->id]);
 117         void __iomem *base = lvts_sensor->base;
 118         u32 raw_low = lvts_temp_to_raw(low != -INT_MAX ? low : LVTS_MINIMUM_THRESHOLD);
 119         u32 raw_high = lvts_temp_to_raw(high);
 120 +       bool should_update_thresh;
 121 +
 122 +       lvts_sensor->low_thresh = low;
 123 +       lvts_sensor->high_thresh = high;
 124 +
 125 +       should_update_thresh = lvts_should_update_thresh(lvts_ctrl, high);
 126 +       if (should_update_thresh) {
 127 +               lvts_ctrl->high_thresh = high;
 128 +               lvts_ctrl->low_thresh = low;
 129 +       }
 130 +       lvts_update_irq_mask(lvts_ctrl);
 131 +
 132 +       if (!should_update_thresh)
 133 +               return 0;
 134
 135         /*
 136          * Low offset temperature threshold
 137 @@ -521,6 +584,9 @@ static int lvts_sensor_init(struct devic
 138                  */
 139                 lvts_sensor[i].msr = lvts_ctrl_data->mode == LVTS_MSR_IMMEDIATE_MODE ?
 140                         imm_regs[i] : msr_regs[i];
 141 +
 142 +               lvts_sensor[i].low_thresh = INT_MIN;
 143 +               lvts_sensor[i].high_thresh = INT_MIN;
 144         };
 145
 146         lvts_ctrl->num_lvts_sensor = lvts_ctrl_data->num_lvts_sensor;
 147 @@ -688,6 +754,9 @@ static int lvts_ctrl_init(struct device
 148                  */
 149                 lvts_ctrl[i].hw_tshut_raw_temp =
 150                         lvts_temp_to_raw(lvts_data->lvts_ctrl[i].hw_tshut_temp);
 151 +
 152 +               lvts_ctrl[i].low_thresh = INT_MIN;
 153 +               lvts_ctrl[i].high_thresh = INT_MIN;
 154         }
 155
 156         /*