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Message-ID: <CAPybu_1qO9ZJSO3EQwb_ggtTysZpqg6gQXABYW8ekH-UwUp8bQ@mail.gmail.com>
Date: Wed, 30 Oct 2024 12:57:10 +0100
From: Ricardo Ribalda Delgado <ribalda@...nel.org>
To: git@...tzsch.eu
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, Sakari Ailus <sakari.ailus@...ux.intel.com>,
~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH v2 08/13] media: i2c: imx214: Add vblank and hblank controls
On Mon, Oct 21, 2024 at 12:14 AM André Apitzsch via B4 Relay
<devnull+git.apitzsch.eu@...nel.org> wrote:
>
> From: André Apitzsch <git@...tzsch.eu>
>
> Add vblank control to allow changing the framerate /
> higher exposure values.
>
> The vblank and hblank controls are needed for libcamera support.
>
> While at it, fix the minimal exposure time according to the datasheet.
>
> Signed-off-by: André Apitzsch <git@...tzsch.eu>
> ---
> drivers/media/i2c/imx214.c | 119 ++++++++++++++++++++++++++++++++++++---------
> 1 file changed, 97 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
> index 497baad616ad7374a92a3da2b7c1096b1d72a0c7..cb443d8bee6fe72dc9378b2c2d3caae09f8642c5 100644
> --- a/drivers/media/i2c/imx214.c
> +++ b/drivers/media/i2c/imx214.c
> @@ -34,11 +34,18 @@
>
> /* V-TIMING internal */
> #define IMX214_REG_FRM_LENGTH_LINES CCI_REG16(0x0340)
> +#define IMX214_VTS_MAX 0xffff
> +
> +#define IMX214_VBLANK_MIN 890
> +
> +/* HBLANK control - read only */
> +#define IMX214_PPL_DEFAULT 5008
>
> /* Exposure control */
> #define IMX214_REG_EXPOSURE CCI_REG16(0x0202)
> -#define IMX214_EXPOSURE_MIN 0
> -#define IMX214_EXPOSURE_MAX 3184
> +#define IMX214_EXPOSURE_OFFSET 10
> +#define IMX214_EXPOSURE_MIN 1
> +#define IMX214_EXPOSURE_MAX (IMX214_VTS_MAX - IMX214_EXPOSURE_OFFSET)
this definition is never used
> #define IMX214_EXPOSURE_STEP 1
> #define IMX214_EXPOSURE_DEFAULT 3184
> #define IMX214_REG_EXPOSURE_RATIO CCI_REG8(0x0222)
> @@ -187,6 +194,8 @@ struct imx214 {
> struct v4l2_ctrl_handler ctrls;
> struct v4l2_ctrl *pixel_rate;
> struct v4l2_ctrl *link_freq;
> + struct v4l2_ctrl *vblank;
> + struct v4l2_ctrl *hblank;
> struct v4l2_ctrl *exposure;
> struct v4l2_ctrl *unit_size;
>
> @@ -202,8 +211,6 @@ static const struct cci_reg_sequence mode_4096x2304[] = {
> { IMX214_REG_HDR_MODE, IMX214_HDR_MODE_OFF },
> { IMX214_REG_HDR_RES_REDUCTION, IMX214_HDR_RES_REDU_THROUGH },
> { IMX214_REG_EXPOSURE_RATIO, 1 },
> - { IMX214_REG_FRM_LENGTH_LINES, 3194 },
> - { IMX214_REG_LINE_LENGTH_PCK, 5008 },
> { IMX214_REG_X_ADD_STA, 56 },
> { IMX214_REG_Y_ADD_STA, 408 },
> { IMX214_REG_X_ADD_END, 4151 },
> @@ -274,8 +281,6 @@ static const struct cci_reg_sequence mode_1920x1080[] = {
> { IMX214_REG_HDR_MODE, IMX214_HDR_MODE_OFF },
> { IMX214_REG_HDR_RES_REDUCTION, IMX214_HDR_RES_REDU_THROUGH },
> { IMX214_REG_EXPOSURE_RATIO, 1 },
> - { IMX214_REG_FRM_LENGTH_LINES, 3194 },
> - { IMX214_REG_LINE_LENGTH_PCK, 5008 },
> { IMX214_REG_X_ADD_STA, 1144 },
> { IMX214_REG_Y_ADD_STA, 1020 },
> { IMX214_REG_X_ADD_END, 3063 },
> @@ -359,6 +364,7 @@ static const struct cci_reg_sequence mode_table_common[] = {
> { IMX214_REG_ORIENTATION, 0 },
> { IMX214_REG_MASK_CORR_FRAMES, IMX214_CORR_FRAMES_MASK },
> { IMX214_REG_FAST_STANDBY_CTRL, 1 },
> + { IMX214_REG_LINE_LENGTH_PCK, IMX214_PPL_DEFAULT },
> { CCI_REG8(0x4550), 0x02 },
> { CCI_REG8(0x4601), 0x00 },
> { CCI_REG8(0x4642), 0x05 },
> @@ -462,18 +468,24 @@ static const struct cci_reg_sequence mode_table_common[] = {
> static const struct imx214_mode {
> u32 width;
> u32 height;
> +
> + /* V-timing */
> + unsigned int vts_def;
> +
> unsigned int num_of_regs;
> const struct cci_reg_sequence *reg_table;
> } imx214_modes[] = {
> {
> .width = 4096,
> .height = 2304,
> + .vts_def = 3194,
> .num_of_regs = ARRAY_SIZE(mode_4096x2304),
> .reg_table = mode_4096x2304,
> },
> {
> .width = 1920,
> .height = 1080,
> + .vts_def = 3194,
> .num_of_regs = ARRAY_SIZE(mode_1920x1080),
> .reg_table = mode_1920x1080,
> },
> @@ -629,9 +641,39 @@ static int imx214_set_format(struct v4l2_subdev *sd,
> __crop->width = mode->width;
> __crop->height = mode->height;
>
> - if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> + int exposure_max;
> + int exposure_def;
> + int hblank;
> +
> imx214->cur_mode = mode;
>
> + /* Update limits and set FPS to default */
> + __v4l2_ctrl_modify_range(imx214->vblank, IMX214_VBLANK_MIN,
> + IMX214_VTS_MAX - mode->height, 2,
> + mode->vts_def - mode->height);
> + __v4l2_ctrl_s_ctrl(imx214->vblank,
> + mode->vts_def - mode->height);
Do we need to set FPS to default?
> +
> + /* Update max exposure while meeting expected vblanking */
> + exposure_max = mode->vts_def - IMX214_EXPOSURE_OFFSET;
> + exposure_def = (exposure_max < IMX214_EXPOSURE_DEFAULT) ?
> + exposure_max : IMX214_EXPOSURE_DEFAULT;
exposure_def = min(exposure_max, IMX214_EXPOSURE_DEFAULT);
> + __v4l2_ctrl_modify_range(imx214->exposure,
> + imx214->exposure->minimum,
> + exposure_max, imx214->exposure->step,
> + exposure_def);
> +
> + /*
> + * Currently PPL is fixed to IMX214_PPL_DEFAULT, so hblank
> + * depends on mode->width only, and is not changeble in any
> + * way other than changing the mode.
> + */
> + hblank = IMX214_PPL_DEFAULT - mode->width;
> + __v4l2_ctrl_modify_range(imx214->hblank, hblank, hblank, 1,
> + hblank);
> + }
> +
> return 0;
> }
>
> @@ -681,8 +723,25 @@ static int imx214_set_ctrl(struct v4l2_ctrl *ctrl)
> {
> struct imx214 *imx214 = container_of(ctrl->handler,
> struct imx214, ctrls);
> + const struct v4l2_mbus_framefmt *format;
> + struct v4l2_subdev_state *state;
> int ret;
>
> + state = v4l2_subdev_get_locked_active_state(&imx214->sd);
> + format = v4l2_subdev_state_get_format(state, 0);
> +
> + if (ctrl->id == V4L2_CID_VBLANK) {
> + int exposure_max, exposure_def;
Not sure if the compiler will like it, but have you tried to set state
and format under this if?
> +
> + /* Update max exposure while meeting expected vblanking */
> + exposure_max = format->height + ctrl->val - IMX214_EXPOSURE_OFFSET;
> + exposure_def = min(exposure_max, IMX214_EXPOSURE_DEFAULT);
> + __v4l2_ctrl_modify_range(imx214->exposure,
> + imx214->exposure->minimum,
> + exposure_max, imx214->exposure->step,
> + exposure_def);
> + }
> +
> /*
> * Applying V4L2 control value only happens
> * when power is up for streaming
> @@ -694,7 +753,10 @@ static int imx214_set_ctrl(struct v4l2_ctrl *ctrl)
> case V4L2_CID_EXPOSURE:
> cci_write(imx214->regmap, IMX214_REG_EXPOSURE, ctrl->val, &ret);
> break;
> -
> + case V4L2_CID_VBLANK:
> + cci_write(imx214->regmap, IMX214_REG_FRM_LENGTH_LINES,
> + format->height + ctrl->val, &ret);
> + break;
> default:
> ret = -EINVAL;
> }
> @@ -717,8 +779,11 @@ static int imx214_ctrls_init(struct imx214 *imx214)
> .width = 1120,
> .height = 1120,
> };
> + const struct imx214_mode *mode = &imx214_modes[0];
> struct v4l2_fwnode_device_properties props;
> struct v4l2_ctrl_handler *ctrl_hdlr;
> + int exposure_max, exposure_def;
> + int hblank;
> int ret;
>
> ret = v4l2_fwnode_device_parse(imx214->dev, &props);
> @@ -726,7 +791,7 @@ static int imx214_ctrls_init(struct imx214 *imx214)
> return ret;
>
> ctrl_hdlr = &imx214->ctrls;
> - ret = v4l2_ctrl_handler_init(&imx214->ctrls, 6);
> + ret = v4l2_ctrl_handler_init(&imx214->ctrls, 8);
> if (ret)
> return ret;
>
> @@ -742,22 +807,26 @@ static int imx214_ctrls_init(struct imx214 *imx214)
> if (imx214->link_freq)
> imx214->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
>
> - /*
> - * WARNING!
> - * Values obtained reverse engineering blobs and/or devices.
> - * Ranges and functionality might be wrong.
> - *
> - * Sony, please release some register set documentation for the
> - * device.
> - *
> - * Yours sincerely, Ricardo.
> - */
Please keep my message ;)
> + /* Initial vblank/hblank/exposure parameters based on current mode */
> + imx214->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx214_ctrl_ops,
> + V4L2_CID_VBLANK, IMX214_VBLANK_MIN,
> + IMX214_VTS_MAX - mode->height, 2,
> + mode->vts_def - mode->height);
> +
> + hblank = IMX214_PPL_DEFAULT - mode->width;
> + imx214->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx214_ctrl_ops,
> + V4L2_CID_HBLANK, hblank, hblank,
> + 1, hblank);
> + if (imx214->hblank)
> + imx214->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> + exposure_max = mode->vts_def - IMX214_EXPOSURE_OFFSET;
> + exposure_def = min(exposure_max, IMX214_EXPOSURE_DEFAULT);
> imx214->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &imx214_ctrl_ops,
> V4L2_CID_EXPOSURE,
> - IMX214_EXPOSURE_MIN,
> - IMX214_EXPOSURE_MAX,
> + IMX214_EXPOSURE_MIN, exposure_max,
> IMX214_EXPOSURE_STEP,
> - IMX214_EXPOSURE_DEFAULT);
> + exposure_def);
>
> imx214->unit_size = v4l2_ctrl_new_std_compound(ctrl_hdlr,
> NULL,
> @@ -879,6 +948,12 @@ static int imx214_get_frame_interval(struct v4l2_subdev *subdev,
> return 0;
> }
>
> +/*
> + * Raw sensors should be using the VBLANK and HBLANK controls to determine
> + * the frame rate. However this driver was initially added using the
> + * [S|G|ENUM]_FRAME_INTERVAL ioctls with a fixed rate of 30fps.
> + * Retain the frame_interval ops for backwards compatibility, but they do nothing.
> + */
> static int imx214_enum_frame_interval(struct v4l2_subdev *subdev,
> struct v4l2_subdev_state *sd_state,
> struct v4l2_subdev_frame_interval_enum *fie)
>
> --
> 2.47.0
>
>
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