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120 lines
4.0 KiB
Diff
120 lines
4.0 KiB
Diff
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From c92b64465d1f6dbfaf189dbf68128ec52fcb0521 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 30 Apr 2020 11:03:00 +0100
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Subject: [PATCH] media: i2c: ov5647: Advertise the correct exposure
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range
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Exposure is clipped by the VTS of the mode, so needs to be updated as
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and when this is changed.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/i2c/ov5647.c | 47 +++++++++++++++++++++++++++++++-------
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1 file changed, 39 insertions(+), 8 deletions(-)
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--- a/drivers/media/i2c/ov5647.c
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+++ b/drivers/media/i2c/ov5647.c
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@@ -84,6 +84,11 @@
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#define OV5647_VBLANK_MIN 4
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#define OV5647_VTS_MAX 32767
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+#define OV5647_EXPOSURE_MIN 4
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+#define OV5647_EXPOSURE_STEP 1
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+#define OV5647_EXPOSURE_DEFAULT 1000
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+#define OV5647_EXPOSURE_MAX 65535
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+
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struct regval_list {
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u16 addr;
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u8 data;
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@@ -117,6 +122,7 @@ struct ov5647 {
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struct v4l2_ctrl *pixel_rate;
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struct v4l2_ctrl *hblank;
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struct v4l2_ctrl *vblank;
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+ struct v4l2_ctrl *exposure;
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bool write_mode_regs;
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};
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@@ -1202,7 +1208,7 @@ static int ov5647_set_fmt(struct v4l2_su
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* If we have changed modes, write the I2C register list on
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* a stream_on().
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*/
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- int hblank;
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+ int exposure_max, exposure_def, hblank;
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if (state->mode != mode)
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state->write_mode_regs = true;
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@@ -1223,6 +1229,15 @@ static int ov5647_set_fmt(struct v4l2_su
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mode->vts_def - mode->format.height);
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__v4l2_ctrl_s_ctrl(state->vblank,
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mode->vts_def - mode->format.height);
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+
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+ exposure_max = mode->vts_def - 4;
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+ exposure_def = (exposure_max < OV5647_EXPOSURE_DEFAULT) ?
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+ exposure_max : OV5647_EXPOSURE_DEFAULT;
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+ __v4l2_ctrl_modify_range(state->exposure,
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+ state->exposure->minimum,
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+ exposure_max,
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+ state->exposure->step,
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+ exposure_def);
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}
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mutex_unlock(&state->lock);
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@@ -1415,6 +1430,19 @@ static int ov5647_s_ctrl(struct v4l2_ctr
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/* v4l2_ctrl_lock() locks our own mutex */
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+ if (ctrl->id == V4L2_CID_VBLANK) {
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+ int exposure_max, exposure_def;
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+
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+ /* Update max exposure while meeting expected vblanking */
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+ exposure_max = state->mode->format.height + ctrl->val - 4;
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+ exposure_def = (exposure_max < OV5647_EXPOSURE_DEFAULT) ?
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+ exposure_max : OV5647_EXPOSURE_DEFAULT;
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+ __v4l2_ctrl_modify_range(state->exposure,
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+ state->exposure->minimum,
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+ exposure_max, state->exposure->step,
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+ exposure_def);
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+ }
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+
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/*
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* If the device is not powered up by the host driver do
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* not apply any controls to H/W at this time. Instead
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@@ -1472,7 +1500,7 @@ static int ov5647_probe(struct i2c_clien
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struct v4l2_subdev *sd;
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struct device_node *np = client->dev.of_node;
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u32 xclk_freq;
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- int hblank;
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+ int hblank, exposure_max, exposure_def;
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sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
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if (!sensor)
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@@ -1525,12 +1553,6 @@ static int ov5647_probe(struct i2c_clien
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0, /* skip_mask */
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V4L2_EXPOSURE_MANUAL); /* default */
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v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
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- V4L2_CID_EXPOSURE,
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- 4, /* min lines */
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- 65535, /* max lines (4+8+4 bits)*/
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- 1, /* step */
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- 1000); /* default number of lines */
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- v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
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V4L2_CID_ANALOGUE_GAIN,
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16, /* min, 16 = 1.0x */
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1023, /* max (10 bits) */
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@@ -1540,6 +1562,15 @@ static int ov5647_probe(struct i2c_clien
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/* Set the default mode before we init the subdev */
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sensor->mode = OV5647_DEFAULT_MODE;
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+ exposure_max = sensor->mode->vts_def - 4;
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+ exposure_def = (exposure_max < OV5647_EXPOSURE_DEFAULT) ?
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+ exposure_max : OV5647_EXPOSURE_DEFAULT;
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+ sensor->exposure = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
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+ V4L2_CID_EXPOSURE,
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+ OV5647_EXPOSURE_MIN, exposure_max,
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+ OV5647_EXPOSURE_STEP,
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+ exposure_def);
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+
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/* By default, PIXEL_RATE is read only, but it does change per mode */
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sensor->pixel_rate = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
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V4L2_CID_PIXEL_RATE,
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