mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 06:08:08 +00:00
8299d1f057
Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted patches, wireless patches and defconfig patches. bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 4B v1.1 4G bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
183 lines
6.2 KiB
Diff
183 lines
6.2 KiB
Diff
From bb77f5ad580f08b0b60579370ad176a23960364a Mon Sep 17 00:00:00 2001
|
|
From: Naushir Patuck <naush@raspberrypi.com>
|
|
Date: Fri, 8 May 2020 09:41:17 +0100
|
|
Subject: [PATCH] media: i2c: imx477: Add support for adaptive frame
|
|
control
|
|
|
|
Use V4L2_CID_EXPOSURE_AUTO_PRIORITY to control if the driver should
|
|
automatically adjust the sensor frame length based on exposure time,
|
|
allowing variable frame rates and longer exposures.
|
|
|
|
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
|
|
---
|
|
drivers/media/i2c/imx477.c | 113 +++++++++++++++++++++++++++++--------
|
|
1 file changed, 91 insertions(+), 22 deletions(-)
|
|
|
|
--- a/drivers/media/i2c/imx477.c
|
|
+++ b/drivers/media/i2c/imx477.c
|
|
@@ -1082,6 +1082,8 @@ struct imx477 {
|
|
struct v4l2_ctrl *hflip;
|
|
struct v4l2_ctrl *vblank;
|
|
struct v4l2_ctrl *hblank;
|
|
+ /* This ctrl allows automatic variable framerate */
|
|
+ struct v4l2_ctrl *exposure_auto;
|
|
|
|
/* Current mode */
|
|
const struct imx477_mode *mode;
|
|
@@ -1278,6 +1280,72 @@ static int imx477_open(struct v4l2_subde
|
|
return 0;
|
|
}
|
|
|
|
+static int imx477_set_exposure(struct imx477 *imx477, unsigned int val)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ ret = imx477_write_reg(imx477, IMX477_REG_EXPOSURE,
|
|
+ IMX477_REG_VALUE_16BIT, val);
|
|
+
|
|
+ /* Setup the frame length in the case of auto framerate mode. */
|
|
+ if (imx477->exposure_auto->val) {
|
|
+ unsigned int frame_length, frame_length_max, frame_length_min;
|
|
+
|
|
+ frame_length_min = imx477->vblank->minimum +
|
|
+ imx477->mode->height;
|
|
+ frame_length_max = imx477->vblank->maximum +
|
|
+ imx477->mode->height;
|
|
+ frame_length = max(frame_length_min,
|
|
+ val + IMX477_EXPOSURE_OFFSET);
|
|
+ frame_length = min(frame_length_max, frame_length);
|
|
+ ret += imx477_write_reg(imx477, IMX477_REG_FRAME_LENGTH,
|
|
+ IMX477_REG_VALUE_16BIT, frame_length);
|
|
+ }
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static void imx477_adjust_exposure_range(struct imx477 *imx477,
|
|
+ struct v4l2_ctrl *ctrl)
|
|
+{
|
|
+ int exposure_max, exposure_def;
|
|
+
|
|
+ if (ctrl->id == V4L2_CID_VBLANK || !ctrl->val) {
|
|
+ /*
|
|
+ * Either VBLANK has been changed or auto framerate
|
|
+ * adjusting has been disabled. Honour the VBLANK limits
|
|
+ * when setting exposure.
|
|
+ */
|
|
+ exposure_max = imx477->mode->height + imx477->vblank->val -
|
|
+ IMX477_EXPOSURE_OFFSET;
|
|
+
|
|
+ if (ctrl->id == V4L2_CID_EXPOSURE_AUTO_PRIORITY) {
|
|
+ /*
|
|
+ * Allow VBLANK adjustments since the driver is not
|
|
+ * handling frame length control automatically.
|
|
+ */
|
|
+ __v4l2_ctrl_grab(imx477->vblank, false);
|
|
+ }
|
|
+ } else {
|
|
+ /*
|
|
+ * Auto framerate adjusting has been enabled. VBLANK
|
|
+ * ctrl has been disabled and exposure can ramp up
|
|
+ * to the maximum allowable value.
|
|
+ */
|
|
+ exposure_max = IMX477_EXPOSURE_MAX;
|
|
+ /*
|
|
+ * Do not allow VBLANK adjustments if the driver is
|
|
+ * handling it frame length control automatically.
|
|
+ */
|
|
+ __v4l2_ctrl_grab(imx477->vblank, true);
|
|
+ }
|
|
+
|
|
+ exposure_def = min(exposure_max, imx477->exposure->val);
|
|
+ __v4l2_ctrl_modify_range(imx477->exposure, imx477->exposure->minimum,
|
|
+ exposure_max, imx477->exposure->step,
|
|
+ exposure_def);
|
|
+}
|
|
+
|
|
static int imx477_set_ctrl(struct v4l2_ctrl *ctrl)
|
|
{
|
|
struct imx477 *imx477 =
|
|
@@ -1285,17 +1353,13 @@ static int imx477_set_ctrl(struct v4l2_c
|
|
struct i2c_client *client = v4l2_get_subdevdata(&imx477->sd);
|
|
int ret = 0;
|
|
|
|
- if (ctrl->id == V4L2_CID_VBLANK) {
|
|
- int exposure_max, exposure_def;
|
|
-
|
|
- /* Update max exposure while meeting expected vblanking */
|
|
- exposure_max = imx477->mode->height + ctrl->val -
|
|
- IMX477_EXPOSURE_OFFSET;
|
|
- exposure_def = min(exposure_max, imx477->exposure->val);
|
|
- __v4l2_ctrl_modify_range(imx477->exposure,
|
|
- imx477->exposure->minimum,
|
|
- exposure_max, imx477->exposure->step,
|
|
- exposure_def);
|
|
+ if (ctrl->id == V4L2_CID_VBLANK ||
|
|
+ ctrl->id == V4L2_CID_EXPOSURE_AUTO_PRIORITY) {
|
|
+ /*
|
|
+ * These controls may change the limits of usable exposure,
|
|
+ * so check and adjust if necessary.
|
|
+ */
|
|
+ imx477_adjust_exposure_range(imx477, ctrl);
|
|
}
|
|
|
|
/*
|
|
@@ -1311,8 +1375,14 @@ static int imx477_set_ctrl(struct v4l2_c
|
|
IMX477_REG_VALUE_16BIT, ctrl->val);
|
|
break;
|
|
case V4L2_CID_EXPOSURE:
|
|
- ret = imx477_write_reg(imx477, IMX477_REG_EXPOSURE,
|
|
- IMX477_REG_VALUE_16BIT, ctrl->val);
|
|
+ ret = imx477_set_exposure(imx477, ctrl->val);
|
|
+ break;
|
|
+ case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
|
|
+ /*
|
|
+ * imx477_set_exposure() will recalculate the frame length
|
|
+ * to adjust the framerate to match the exposure.
|
|
+ */
|
|
+ ret = imx477_set_exposure(imx477, imx477->exposure->val);
|
|
break;
|
|
case V4L2_CID_DIGITAL_GAIN:
|
|
ret = imx477_write_reg(imx477, IMX477_REG_DIGITAL_GAIN,
|
|
@@ -1510,9 +1580,8 @@ unsigned int imx477_get_frame_length(con
|
|
|
|
static void imx477_set_framing_limits(struct imx477 *imx477)
|
|
{
|
|
+ unsigned int frm_length_min, frm_length_default, hblank;
|
|
const struct imx477_mode *mode = imx477->mode;
|
|
- unsigned int frm_length_min, frm_length_default;
|
|
- unsigned int exposure_max, exposure_def, hblank;
|
|
|
|
frm_length_min = imx477_get_frame_length(mode, &mode->timeperframe_min);
|
|
frm_length_default =
|
|
@@ -1522,15 +1591,10 @@ static void imx477_set_framing_limits(st
|
|
__v4l2_ctrl_modify_range(imx477->vblank, frm_length_min - mode->height,
|
|
IMX477_FRAME_LENGTH_MAX - mode->height,
|
|
1, frm_length_default - mode->height);
|
|
+
|
|
+ /* Setting this will adjust the exposure limits as well. */
|
|
__v4l2_ctrl_s_ctrl(imx477->vblank, frm_length_default - mode->height);
|
|
|
|
- /* Update max exposure while meeting expected vblanking */
|
|
- exposure_max = IMX477_FRAME_LENGTH_MAX - IMX477_EXPOSURE_OFFSET;
|
|
- exposure_def = frm_length_default - mode->height -
|
|
- IMX477_EXPOSURE_OFFSET;
|
|
- __v4l2_ctrl_modify_range(imx477->exposure, imx477->exposure->minimum,
|
|
- exposure_max, imx477->exposure->step,
|
|
- exposure_def);
|
|
/*
|
|
* Currently PPL is fixed to the mode specified value, so hblank
|
|
* depends on mode->width only, and is not changeable in any
|
|
@@ -1939,6 +2003,11 @@ static int imx477_init_controls(struct i
|
|
IMX477_DGTL_GAIN_MIN, IMX477_DGTL_GAIN_MAX,
|
|
IMX477_DGTL_GAIN_STEP, IMX477_DGTL_GAIN_DEFAULT);
|
|
|
|
+ imx477->exposure_auto =
|
|
+ v4l2_ctrl_new_std(ctrl_hdlr, &imx477_ctrl_ops,
|
|
+ V4L2_CID_EXPOSURE_AUTO_PRIORITY,
|
|
+ 0, 1, 1, 0);
|
|
+
|
|
imx477->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx477_ctrl_ops,
|
|
V4L2_CID_HFLIP, 0, 1, 1, 0);
|
|
if (imx477->hflip)
|