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103 lines
3.1 KiB
Diff
103 lines
3.1 KiB
Diff
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From 321814f1f361336278e9d682492152098b0a0f00 Mon Sep 17 00:00:00 2001
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From: Naushir Patuck <naush@raspberrypi.com>
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Date: Thu, 5 Jan 2023 14:44:48 +0000
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Subject: [PATCH] drivers: media: imx708: Enable long exposure mode
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Enable long exposure modes by using the long exposure shift register setting
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in the imx708 sensor.
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Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
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---
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drivers/media/i2c/imx708.c | 41 +++++++++++++++++++++++++++++++++-----
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1 file changed, 36 insertions(+), 5 deletions(-)
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--- a/drivers/media/i2c/imx708.c
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+++ b/drivers/media/i2c/imx708.c
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@@ -44,6 +44,10 @@
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#define IMX708_REG_FRAME_LENGTH 0x0340
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#define IMX708_FRAME_LENGTH_MAX 0xffff
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+/* Long exposure multiplier */
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+#define IMX708_LONG_EXP_SHIFT_MAX 7
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+#define IMX708_LONG_EXP_SHIFT_REG 0x3100
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+
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/* Exposure control */
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#define IMX708_REG_EXPOSURE 0x0202
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#define IMX708_EXPOSURE_OFFSET 48
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@@ -806,6 +810,9 @@ struct imx708 {
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/* Rewrite common registers on stream on? */
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bool common_regs_written;
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+
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+ /* Current long exposure factor in use. Set through V4L2_CID_VBLANK */
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+ unsigned int long_exp_shift;
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};
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static inline struct imx708 *to_imx708(struct v4l2_subdev *_sd)
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@@ -994,7 +1001,8 @@ static int imx708_set_exposure(struct im
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* will automatically divide the medium and short ones by 4,16.
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*/
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ret = imx708_write_reg(imx708, IMX708_REG_EXPOSURE,
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- IMX708_REG_VALUE_16BIT, val);
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+ IMX708_REG_VALUE_16BIT,
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+ val >> imx708->long_exp_shift);
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return ret;
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}
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@@ -1027,18 +1035,42 @@ static int imx708_set_analogue_gain(stru
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return ret;
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}
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+static int imx708_set_frame_length(struct imx708 *imx708, unsigned int val)
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+{
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+ int ret = 0;
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+
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+ imx708->long_exp_shift = 0;
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+
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+ while (val > IMX708_FRAME_LENGTH_MAX) {
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+ imx708->long_exp_shift++;
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+ val >>= 1;
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+ }
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+
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+ ret = imx708_write_reg(imx708, IMX708_REG_FRAME_LENGTH,
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+ IMX708_REG_VALUE_16BIT, val);
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+ if (ret)
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+ return ret;
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+
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+ return imx708_write_reg(imx708, IMX708_LONG_EXP_SHIFT_REG,
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+ IMX708_REG_VALUE_08BIT, imx708->long_exp_shift);
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+}
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+
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static void imx708_set_framing_limits(struct imx708 *imx708)
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{
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unsigned int hblank;
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const struct imx708_mode *mode = imx708->mode;
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+ /* Default to no long exposure multiplier */
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+ imx708->long_exp_shift = 0;
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+
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__v4l2_ctrl_modify_range(imx708->pixel_rate,
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mode->pixel_rate, mode->pixel_rate,
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1, mode->pixel_rate);
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/* Update limits and set FPS to default */
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__v4l2_ctrl_modify_range(imx708->vblank, mode->vblank_min,
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- IMX708_FRAME_LENGTH_MAX - mode->height,
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+ ((1 << IMX708_LONG_EXP_SHIFT_MAX) *
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+ IMX708_FRAME_LENGTH_MAX) - mode->height,
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1, mode->vblank_default);
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/*
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@@ -1112,9 +1144,8 @@ static int imx708_set_ctrl(struct v4l2_c
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imx708->vflip->val << 1);
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break;
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case V4L2_CID_VBLANK:
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- ret = imx708_write_reg(imx708, IMX708_REG_FRAME_LENGTH,
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- IMX708_REG_VALUE_16BIT,
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- imx708->mode->height + ctrl->val);
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+ ret = imx708_set_frame_length(imx708,
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+ imx708->mode->height + ctrl->val);
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break;
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case V4L2_CID_NOTIFY_GAINS:
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ret = imx708_write_reg(imx708, IMX708_REG_COLOUR_BALANCE_BLUE,
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