target/linux/bcm27xx/patches-5.15/950-0516-regulator-rpi-panel-Remove-get_brightness-hook.patch

   1 From 7019ea2a7587700e366729872bdec56d54842c8c Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Tue, 21 Sep 2021 15:32:50 +0100
   4 Subject: [PATCH] regulator: rpi-panel: Remove get_brightness hook
   5
   6 The driver was implementing a get_brightness function that
   7 tried to read back the PWM setting of the display to report
   8 as the current brightness.
   9 The controller on the display does not support that, therefore
  10 we end up reporting a brightness of 0, and that confuses
  11 systemd's backlight service.
  12
  13 Remove the hook so that the framework returns the current
  14 brightness automatically.
  15
  16 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  17 ---
  18  .../regulator/rpi-panel-attiny-regulator.c    | 23 -------------------
  19  1 file changed, 23 deletions(-)
  20
  21 --- a/drivers/regulator/rpi-panel-attiny-regulator.c
  22 +++ b/drivers/regulator/rpi-panel-attiny-regulator.c
  23 @@ -207,31 +207,8 @@ static int attiny_update_status(struct b
  24         return ret;
  25  }
  26
  27 -static int attiny_get_brightness(struct backlight_device *bl)
  28 -{
  29 -       struct attiny_lcd *state = bl_get_data(bl);
  30 -       struct regmap *regmap = state->regmap;
  31 -       int ret, brightness, i;
  32 -
  33 -       mutex_lock(&state->lock);
  34 -
  35 -       for (i = 0; i < 10; i++) {
  36 -               ret = regmap_read(regmap, REG_PWM, &brightness);
  37 -               if (!ret)
  38 -                       break;
  39 -       }
  40 -
  41 -       mutex_unlock(&state->lock);
  42 -
  43 -       if (ret)
  44 -               return ret;
  45 -
  46 -       return brightness;
  47 -}
  48 -
  49  static const struct backlight_ops attiny_bl = {
  50         .update_status  = attiny_update_status,
  51 -       .get_brightness = attiny_get_brightness,
  52  };
  53
  54  static int attiny_gpio_get_direction(struct gpio_chip *gc, unsigned int off)