target/linux/bcm27xx/patches-6.1/950-0527-media-dw9807-vcm-Smooth-the-first-user-movement-of-t.patch

   1 From a701a312ff709f0dcd6862be6e8fcc328379c4d1 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Tue, 3 Jan 2023 16:53:37 +0000
   4 Subject: [PATCH] media: dw9807-vcm: Smooth the first user movement of
   5  the lens
   6
   7 The power up/down sequence is already ramped. Extend this to
   8 the first user movement as well, as this will generally avoid
   9 the "tick" noises due to rapid movements and overshooting.
  10 Subsequent movements are generally smaller and so don't cause
  11 issues.
  12
  13 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  14 ---
  15  drivers/media/i2c/dw9807-vcm.c | 7 ++++++-
  16  1 file changed, 6 insertions(+), 1 deletion(-)
  17
  18 --- a/drivers/media/i2c/dw9807-vcm.c
  19 +++ b/drivers/media/i2c/dw9807-vcm.c
  20 @@ -62,6 +62,7 @@ struct dw9807_device {
  21         u16 idle_pos;
  22         struct regulator *vdd;
  23         struct notifier_block notifier;
  24 +       bool first;
  25  };
  26
  27  static inline struct dw9807_device *sd_to_dw9807_vcm(
  28 @@ -176,6 +177,8 @@ static int dw9807_active(struct dw9807_d
  29                 return ret;
  30         }
  31
  32 +       dw9807_dev->first = true;
  33 +
  34         return dw9807_ramp(client, dw9807_dev->idle_pos, dw9807_dev->current_val);
  35  }
  36
  37 @@ -230,9 +233,11 @@ static int dw9807_set_ctrl(struct v4l2_c
  38
  39         if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) {
  40                 struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);
  41 +               int start = (dev_vcm->first) ? dev_vcm->current_val : ctrl->val;
  42
  43 +               dev_vcm->first = false;
  44                 dev_vcm->current_val = ctrl->val;
  45 -               return dw9807_ramp(client, ctrl->val, ctrl->val);
  46 +               return dw9807_ramp(client, start, ctrl->val);
  47         }
  48
  49         return -EINVAL;