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50 lines
1.5 KiB
Diff
50 lines
1.5 KiB
Diff
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From a701a312ff709f0dcd6862be6e8fcc328379c4d1 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Tue, 3 Jan 2023 16:53:37 +0000
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Subject: [PATCH] media: dw9807-vcm: Smooth the first user movement of
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the lens
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The power up/down sequence is already ramped. Extend this to
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the first user movement as well, as this will generally avoid
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the "tick" noises due to rapid movements and overshooting.
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Subsequent movements are generally smaller and so don't cause
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issues.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/i2c/dw9807-vcm.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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--- a/drivers/media/i2c/dw9807-vcm.c
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+++ b/drivers/media/i2c/dw9807-vcm.c
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@@ -62,6 +62,7 @@ struct dw9807_device {
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u16 idle_pos;
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struct regulator *vdd;
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struct notifier_block notifier;
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+ bool first;
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};
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static inline struct dw9807_device *sd_to_dw9807_vcm(
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@@ -176,6 +177,8 @@ static int dw9807_active(struct dw9807_d
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return ret;
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}
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+ dw9807_dev->first = true;
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+
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return dw9807_ramp(client, dw9807_dev->idle_pos, dw9807_dev->current_val);
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}
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@@ -230,9 +233,11 @@ static int dw9807_set_ctrl(struct v4l2_c
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if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) {
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struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);
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+ int start = (dev_vcm->first) ? dev_vcm->current_val : ctrl->val;
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+ dev_vcm->first = false;
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dev_vcm->current_val = ctrl->val;
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- return dw9807_ramp(client, ctrl->val, ctrl->val);
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+ return dw9807_ramp(client, start, ctrl->val);
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}
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return -EINVAL;
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