104 lines
3.0 KiB
Diff
104 lines
3.0 KiB
Diff
From f6523a46d1ad95d1f269a691ddb7998c86b9264f Mon Sep 17 00:00:00 2001
|
|
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
|
|
Date: Wed, 16 Jun 2021 17:19:17 +0100
|
|
Subject: [PATCH] media: i2c: imx258: Follow normal V4L2 behaviours for
|
|
clipping exposure
|
|
|
|
V4L2 sensor drivers are expected are expected to clip the supported
|
|
exposure range based on the VBLANK configured.
|
|
IMX258 wasn't doing that as register 0x350 (FRM_LENGTH_CTL)
|
|
switches it to a mode where frame length tracks coarse exposure time.
|
|
|
|
Disable this mode and clip the range for V4L2_CID_EXPOSURE appropriately
|
|
based on V4L2_CID_VBLANK.
|
|
|
|
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
|
|
---
|
|
drivers/media/i2c/imx258.c | 35 ++++++++++++++++++++++++++++-------
|
|
1 file changed, 28 insertions(+), 7 deletions(-)
|
|
|
|
--- a/drivers/media/i2c/imx258.c
|
|
+++ b/drivers/media/i2c/imx258.c
|
|
@@ -32,15 +32,16 @@
|
|
|
|
#define IMX258_REG_VTS 0x0340
|
|
|
|
-/* HBLANK control - read only */
|
|
-#define IMX258_PPL_DEFAULT 5352
|
|
-
|
|
/* Exposure control */
|
|
#define IMX258_REG_EXPOSURE 0x0202
|
|
+#define IMX258_EXPOSURE_OFFSET 10
|
|
#define IMX258_EXPOSURE_MIN 4
|
|
#define IMX258_EXPOSURE_STEP 1
|
|
#define IMX258_EXPOSURE_DEFAULT 0x640
|
|
-#define IMX258_EXPOSURE_MAX 65535
|
|
+#define IMX258_EXPOSURE_MAX (IMX258_VTS_MAX - IMX258_EXPOSURE_OFFSET)
|
|
+
|
|
+/* HBLANK control - read only */
|
|
+#define IMX258_PPL_DEFAULT 5352
|
|
|
|
/* Analog gain control */
|
|
#define IMX258_REG_ANALOG_GAIN 0x0204
|
|
@@ -377,7 +378,7 @@ static const struct imx258_reg mode_4208
|
|
{ 0x034D, 0x70 },
|
|
{ 0x034E, 0x0C },
|
|
{ 0x034F, 0x30 },
|
|
- { 0x0350, 0x01 },
|
|
+ { 0x0350, 0x00 },
|
|
{ 0x0204, 0x00 },
|
|
{ 0x0205, 0x00 },
|
|
{ 0x020E, 0x01 },
|
|
@@ -489,7 +490,7 @@ static const struct imx258_reg mode_2104
|
|
{ 0x034D, 0x38 },
|
|
{ 0x034E, 0x06 },
|
|
{ 0x034F, 0x18 },
|
|
- { 0x0350, 0x01 },
|
|
+ { 0x0350, 0x00 },
|
|
{ 0x0204, 0x00 },
|
|
{ 0x0205, 0x00 },
|
|
{ 0x020E, 0x01 },
|
|
@@ -601,7 +602,7 @@ static const struct imx258_reg mode_1048
|
|
{ 0x034D, 0x18 },
|
|
{ 0x034E, 0x03 },
|
|
{ 0x034F, 0x0C },
|
|
- { 0x0350, 0x01 },
|
|
+ { 0x0350, 0x00 },
|
|
{ 0x0204, 0x00 },
|
|
{ 0x0205, 0x00 },
|
|
{ 0x020E, 0x01 },
|
|
@@ -966,6 +967,19 @@ static int imx258_update_digital_gain(st
|
|
return 0;
|
|
}
|
|
|
|
+static void imx258_adjust_exposure_range(struct imx258 *imx258)
|
|
+{
|
|
+ int exposure_max, exposure_def;
|
|
+
|
|
+ /* Honour the VBLANK limits when setting exposure. */
|
|
+ exposure_max = imx258->cur_mode->height + imx258->vblank->val -
|
|
+ IMX258_EXPOSURE_OFFSET;
|
|
+ exposure_def = min(exposure_max, imx258->exposure->val);
|
|
+ __v4l2_ctrl_modify_range(imx258->exposure, imx258->exposure->minimum,
|
|
+ exposure_max, imx258->exposure->step,
|
|
+ exposure_def);
|
|
+}
|
|
+
|
|
static int imx258_set_ctrl(struct v4l2_ctrl *ctrl)
|
|
{
|
|
struct imx258 *imx258 =
|
|
@@ -974,6 +988,13 @@ static int imx258_set_ctrl(struct v4l2_c
|
|
int ret = 0;
|
|
|
|
/*
|
|
+ * The VBLANK control may change the limits of usable exposure, so check
|
|
+ * and adjust if necessary.
|
|
+ */
|
|
+ if (ctrl->id == V4L2_CID_VBLANK)
|
|
+ imx258_adjust_exposure_range(imx258);
|
|
+
|
|
+ /*
|
|
* Applying V4L2 control value only happens
|
|
* when power is up for streaming
|
|
*/
|