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104 lines
3.0 KiB
Diff
104 lines
3.0 KiB
Diff
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From f6523a46d1ad95d1f269a691ddb7998c86b9264f Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Wed, 16 Jun 2021 17:19:17 +0100
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Subject: [PATCH] media: i2c: imx258: Follow normal V4L2 behaviours for
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clipping exposure
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V4L2 sensor drivers are expected are expected to clip the supported
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exposure range based on the VBLANK configured.
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IMX258 wasn't doing that as register 0x350 (FRM_LENGTH_CTL)
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switches it to a mode where frame length tracks coarse exposure time.
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Disable this mode and clip the range for V4L2_CID_EXPOSURE appropriately
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based on V4L2_CID_VBLANK.
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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 | 35 ++++++++++++++++++++++++++++-------
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1 file changed, 28 insertions(+), 7 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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@@ -32,15 +32,16 @@
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#define IMX258_REG_VTS 0x0340
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-/* HBLANK control - read only */
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-#define IMX258_PPL_DEFAULT 5352
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-
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/* Exposure control */
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#define IMX258_REG_EXPOSURE 0x0202
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+#define IMX258_EXPOSURE_OFFSET 10
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#define IMX258_EXPOSURE_MIN 4
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#define IMX258_EXPOSURE_STEP 1
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#define IMX258_EXPOSURE_DEFAULT 0x640
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-#define IMX258_EXPOSURE_MAX 65535
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+#define IMX258_EXPOSURE_MAX (IMX258_VTS_MAX - IMX258_EXPOSURE_OFFSET)
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+
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+/* HBLANK control - read only */
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+#define IMX258_PPL_DEFAULT 5352
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/* Analog gain control */
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#define IMX258_REG_ANALOG_GAIN 0x0204
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@@ -377,7 +378,7 @@ static const struct imx258_reg mode_4208
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{ 0x034D, 0x70 },
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{ 0x034E, 0x0C },
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{ 0x034F, 0x30 },
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- { 0x0350, 0x01 },
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+ { 0x0350, 0x00 },
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{ 0x0204, 0x00 },
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{ 0x0205, 0x00 },
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{ 0x020E, 0x01 },
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@@ -489,7 +490,7 @@ static const struct imx258_reg mode_2104
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{ 0x034D, 0x38 },
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{ 0x034E, 0x06 },
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{ 0x034F, 0x18 },
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- { 0x0350, 0x01 },
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+ { 0x0350, 0x00 },
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{ 0x0204, 0x00 },
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{ 0x0205, 0x00 },
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{ 0x020E, 0x01 },
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@@ -601,7 +602,7 @@ static const struct imx258_reg mode_1048
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{ 0x034D, 0x18 },
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{ 0x034E, 0x03 },
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{ 0x034F, 0x0C },
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- { 0x0350, 0x01 },
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+ { 0x0350, 0x00 },
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{ 0x0204, 0x00 },
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{ 0x0205, 0x00 },
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{ 0x020E, 0x01 },
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@@ -966,6 +967,19 @@ static int imx258_update_digital_gain(st
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return 0;
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}
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+static void imx258_adjust_exposure_range(struct imx258 *imx258)
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+{
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+ int exposure_max, exposure_def;
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+
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+ /* Honour the VBLANK limits when setting exposure. */
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+ exposure_max = imx258->cur_mode->height + imx258->vblank->val -
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+ IMX258_EXPOSURE_OFFSET;
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+ exposure_def = min(exposure_max, imx258->exposure->val);
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+ __v4l2_ctrl_modify_range(imx258->exposure, imx258->exposure->minimum,
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+ exposure_max, imx258->exposure->step,
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+ exposure_def);
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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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@@ -974,6 +988,13 @@ static int imx258_set_ctrl(struct v4l2_c
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int ret = 0;
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/*
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+ * The VBLANK control may change the limits of usable exposure, so check
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+ * and adjust if necessary.
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+ */
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+ if (ctrl->id == V4L2_CID_VBLANK)
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+ imx258_adjust_exposure_range(imx258);
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+
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+ /*
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* Applying V4L2 control value only happens
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* when power is up for streaming
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*/
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