diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0725-media-i2c-imx477-Add-support-for-adaptive-frame-cont.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0725-media-i2c-imx477-Add-support-for-adaptive-frame-cont.patch | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0725-media-i2c-imx477-Add-support-for-adaptive-frame-cont.patch b/target/linux/bcm27xx/patches-5.4/950-0725-media-i2c-imx477-Add-support-for-adaptive-frame-cont.patch new file mode 100644 index 0000000000..1da5dea326 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0725-media-i2c-imx477-Add-support-for-adaptive-frame-cont.patch @@ -0,0 +1,182 @@ +From 69f1022fc3c155f8cd5cf7dacaf283b1778835f3 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) |