target/linux/mediatek/patches-6.1/830-v6.4-20-Revert-thermal-drivers-mediatek-Add-delay-after-ther.patch

   1 From 7105a86760bd9e4d107075cefc75016b693a5542 Mon Sep 17 00:00:00 2001
   2 From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
   3 Date: Wed, 19 Apr 2023 08:11:45 +0200
   4 Subject: [PATCH 16/42] Revert "thermal/drivers/mediatek: Add delay after
   5  thermal banks initialization"
   6
   7 Some more testing revealed that this commit introduces a regression on some
   8 MT8173 Chromebooks and at least on one MT6795 Sony Xperia M5 smartphone due
   9 to the delay being apparently variable and machine specific.
  10
  11 Another solution would be to delay for a bit more (~70ms) but this is not
  12 feasible for two reasons: first of all, we're adding an even bigger delay
  13 in a probe function; second, some machines need less, some may need even
  14 more, making the msleep at probe solution highly suboptimal.
  15
  16 This reverts commit 10debf8c2da8011c8009dd4b3f6d0ab85891c81b.
  17
  18 Fixes: 10debf8c2da8 ("thermal/drivers/mediatek: Add delay after thermal banks initialization")
  19 Reported-by: "kernelci.org bot" <bot@kernelci.org>
  20 Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
  21 Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
  22 Link: https://lore.kernel.org/r/20230419061146.22246-2-angelogioacchino.delregno@collabora.com
  23 ---
  24  drivers/thermal/mediatek/auxadc_thermal.c | 11 ++++++++---
  25  1 file changed, 8 insertions(+), 3 deletions(-)
  26
  27 --- a/drivers/thermal/mediatek/auxadc_thermal.c
  28 +++ b/drivers/thermal/mediatek/auxadc_thermal.c
  29 @@ -816,6 +816,14 @@ static int mtk_thermal_bank_temperature(
  30                         mt, conf->bank_data[bank->id].sensors[i], raw);
  31
  32
  33 +               /*
  34 +                * The first read of a sensor often contains very high bogus
  35 +                * temperature value. Filter these out so that the system does
  36 +                * not immediately shut down.
  37 +                */
  38 +               if (temp > 200000)
  39 +                       temp = 0;
  40 +
  41                 if (temp > max)
  42                         max = temp;
  43         }
  44 @@ -1273,9 +1281,6 @@ static int mtk_thermal_probe(struct plat
  45
  46         platform_set_drvdata(pdev, mt);
  47
  48 -       /* Delay for thermal banks to be ready */
  49 -       msleep(30);
  50 -
  51         tzdev = devm_thermal_of_zone_register(&pdev->dev, 0, mt,
  52                                               &mtk_thermal_ops);
  53         if (IS_ERR(tzdev)) {