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101 lines
3.1 KiB
Diff
101 lines
3.1 KiB
Diff
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From 4721f56a81e13353f6900a7346bebf330d3d560b Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 31 Mar 2022 16:45:36 +0100
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Subject: [PATCH] media: i2c: imx258: Add support for long exposure
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modes
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The sensor has a register CIT_LSHIFT which extends the exposure
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and frame times by the specified power of 2 for longer
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exposure times.
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Add support for this by configuring this register via V4L2_CID_VBLANK
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and extending the V4L2_CID_EXPOSURE range accordingly.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/i2c/imx258.c | 38 ++++++++++++++++++++++++++++++++------
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1 file changed, 32 insertions(+), 6 deletions(-)
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--- a/drivers/media/i2c/imx258.c
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+++ b/drivers/media/i2c/imx258.c
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@@ -69,6 +69,10 @@
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#define IMX258_HDR_RATIO_STEP 1
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#define IMX258_HDR_RATIO_DEFAULT 0x0
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+/* Long exposure multiplier */
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+#define IMX258_LONG_EXP_SHIFT_MAX 7
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+#define IMX258_LONG_EXP_SHIFT_REG 0x3002
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+
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/* Test Pattern Control */
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#define IMX258_REG_TEST_PATTERN 0x0600
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@@ -843,6 +847,8 @@ struct imx258 {
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struct v4l2_ctrl *exposure;
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struct v4l2_ctrl *hflip;
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struct v4l2_ctrl *vflip;
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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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/* Current mode */
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const struct imx258_mode *cur_mode;
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@@ -1020,6 +1026,26 @@ static void imx258_adjust_exposure_range
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exposure_def);
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}
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+static int imx258_set_frame_length(struct imx258 *imx258, unsigned int val)
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+{
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+ int ret;
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+
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+ imx258->long_exp_shift = 0;
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+
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+ while (val > IMX258_VTS_MAX) {
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+ imx258->long_exp_shift++;
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+ val >>= 1;
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+ }
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+
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+ ret = imx258_write_reg(imx258, IMX258_REG_VTS,
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+ IMX258_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 imx258_write_reg(imx258, IMX258_LONG_EXP_SHIFT_REG,
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+ IMX258_REG_VALUE_08BIT, imx258->long_exp_shift);
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+}
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+
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static int imx258_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct imx258 *imx258 =
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@@ -1050,7 +1076,7 @@ static int imx258_set_ctrl(struct v4l2_c
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case V4L2_CID_EXPOSURE:
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ret = imx258_write_reg(imx258, IMX258_REG_EXPOSURE,
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IMX258_REG_VALUE_16BIT,
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- ctrl->val);
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+ ctrl->val >> imx258->long_exp_shift);
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break;
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case V4L2_CID_DIGITAL_GAIN:
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ret = imx258_update_digital_gain(imx258, IMX258_REG_VALUE_16BIT,
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@@ -1078,9 +1104,8 @@ static int imx258_set_ctrl(struct v4l2_c
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}
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break;
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case V4L2_CID_VBLANK:
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- ret = imx258_write_reg(imx258, IMX258_REG_VTS,
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- IMX258_REG_VALUE_16BIT,
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- imx258->cur_mode->height + ctrl->val);
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+ ret = imx258_set_frame_length(imx258,
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+ imx258->cur_mode->height + ctrl->val);
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break;
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case V4L2_CID_VFLIP:
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case V4L2_CID_HFLIP:
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@@ -1218,8 +1243,9 @@ static int imx258_set_pad_format(struct
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imx258->cur_mode->height;
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__v4l2_ctrl_modify_range(
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imx258->vblank, vblank_min,
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- IMX258_VTS_MAX - imx258->cur_mode->height, 1,
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- vblank_def);
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+ ((1 << IMX258_LONG_EXP_SHIFT_MAX) * IMX258_VTS_MAX) -
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+ imx258->cur_mode->height,
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+ 1, vblank_def);
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__v4l2_ctrl_s_ctrl(imx258->vblank, vblank_def);
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h_blank =
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imx258->link_freq_configs[mode->link_freq_index].pixels_per_line
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