target/linux/mediatek/patches-6.6/830-v6.4-31-thermal-drivers-mediatek-lvts_thermal-Use-offset-thr.patch

   1 From 93bb11dd19bdcc1fc97c7ceababd0db9fde128ad 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 11:37:34 -0400
   5 Subject: [PATCH 27/42] thermal/drivers/mediatek/lvts_thermal: Use offset
   6  threshold for IRQ
   7 MIME-Version: 1.0
   8 Content-Type: text/plain; charset=UTF-8
   9 Content-Transfer-Encoding: 8bit
  10
  11 There are two kinds of temperature monitoring interrupts available:
  12 * High Offset, Low Offset
  13 * Hot, Hot to normal, Cold
  14
  15 The code currently uses the hot/h2n/cold interrupts, however in a way
  16 that doesn't work: the cold threshold is left uninitialized, which
  17 prevents the other thresholds from ever triggering, and the h2n
  18 interrupt is used as the lower threshold, which prevents the hot
  19 interrupt from triggering again after the thresholds are updated by the
  20 thermal framework, since a hot interrupt can only trigger again after
  21 the hot to normal interrupt has been triggered.
  22
  23 But better yet than addressing those issues, is to use the high/low
  24 offset interrupts instead. This way only two thresholds need to be
  25 managed, which have a simpler state machine, making them a better match
  26 to the thermal framework's high and low thresholds.
  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/20230706153823.201943-4-nfraprado@collabora.com
  34 ---
  35  drivers/thermal/mediatek/lvts_thermal.c | 12 ++++++------
  36  1 file changed, 6 insertions(+), 6 deletions(-)
  37
  38 --- a/drivers/thermal/mediatek/lvts_thermal.c
  39 +++ b/drivers/thermal/mediatek/lvts_thermal.c
  40 @@ -298,9 +298,9 @@ static int lvts_set_trips(struct thermal
  41         u32 raw_high = lvts_temp_to_raw(high);
  42
  43         /*
  44 -        * Hot to normal temperature threshold
  45 +        * Low offset temperature threshold
  46          *
  47 -        * LVTS_H2NTHRE
  48 +        * LVTS_OFFSETL
  49          *
  50          * Bits:
  51          *
  52 @@ -309,13 +309,13 @@ static int lvts_set_trips(struct thermal
  53         if (low != -INT_MAX) {
  54                 pr_debug("%s: Setting low limit temperature interrupt: %d\n",
  55                          thermal_zone_device_type(tz), low);
  56 -               writel(raw_low, LVTS_H2NTHRE(base));
  57 +               writel(raw_low, LVTS_OFFSETL(base));
  58         }
  59
  60         /*
  61 -        * Hot temperature threshold
  62 +        * High offset temperature threshold
  63          *
  64 -        * LVTS_HTHRE
  65 +        * LVTS_OFFSETH
  66          *
  67          * Bits:
  68          *
  69 @@ -323,7 +323,7 @@ static int lvts_set_trips(struct thermal
  70          */
  71         pr_debug("%s: Setting high limit temperature interrupt: %d\n",
  72                  thermal_zone_device_type(tz), high);
  73 -       writel(raw_high, LVTS_HTHRE(base));
  74 +       writel(raw_high, LVTS_OFFSETH(base));
  75
  76         return 0;
  77  }