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Message-ID: <CAPybu_0Nk+p1rikH_t_zpEHx=KGnXfG+npr-XEnwtA4EnfJjuQ@mail.gmail.com>
Date: Sun, 8 Dec 2024 22:19:51 +0100
From: Ricardo Ribalda Delgado <ribalda@...nel.org>
To: git@...tzsch.eu
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>, ~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>,
Vincent Knecht <vincent.knecht@...loo.org>
Subject: Re: [PATCH v3 07/12] media: i2c: imx214: Add vblank and hblank controls
On Sun, Dec 8, 2024 at 9:59 PM Ricardo Ribalda Delgado
<ribalda@...nel.org> wrote:
>
> In general it looks good to me (besides the comments, ignore the nits
> if you want to).
>
> I'd recommend that you test with lockdep to make sure that we are not
> missing anything, and I'd like to hear back from Sakari regarding the
> get_locked_active
>
> Thanks!
>
> On Sat, Dec 7, 2024 at 9:48 PM 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 | 106 ++++++++++++++++++++++++++++++++++++++++-----
> > 1 file changed, 94 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
> > index f1c72db0775eaf4810f762e8798d301c5ad9923c..a7f49dbafe0f54af3c02f5534460fdee88a22fe2 100644
> > --- a/drivers/media/i2c/imx214.c
> > +++ b/drivers/media/i2c/imx214.c
> > @@ -34,11 +34,17 @@
> >
> > /* 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_STEP 1
> > #define IMX214_EXPOSURE_DEFAULT 3184
> > #define IMX214_REG_EXPOSURE_RATIO CCI_REG8(0x0222)
> > @@ -187,6 +193,8 @@ 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 +210,6 @@ 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 +280,6 @@ 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 +363,7 @@ 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 +467,24 @@ 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,
> > },
> > @@ -626,9 +637,36 @@ 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 FPS limits */
> nit: Update blank limits
> > + __v4l2_ctrl_modify_range(imx214->vblank, IMX214_VBLANK_MIN,
> > + IMX214_VTS_MAX - mode->height, 2,
> > + mode->vts_def - mode->height);
>
> Is the handler->lock held when we call this function? Can you try
> running the code with lockdep?
> > +
> > + /* Update max exposure while meeting expected vblanking */
> > + exposure_max = mode->vts_def - 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);
> > +
> > + /*
> > + * Currently PPL is fixed to IMX214_PPL_DEFAULT, so hblank
> > + * depends on mode->width only, and is not changeable 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;
> > }
> >
> > @@ -678,8 +716,25 @@ 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;
> >
> > + if (ctrl->id == V4L2_CID_VBLANK) {
> > + int exposure_max, exposure_def;
> > +
> > + state = v4l2_subdev_get_locked_active_state(&imx214->sd);
>
> Sakari, I see that other drivers assume that the active is locked in
> set_ctrl. Is this correct?
imx214->sd.state_lock = imx214->ctrls.lock;
So I guess it is fine :)
>
> > + format = v4l2_subdev_state_get_format(state, 0);
> > +
> > + /* 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
> > @@ -691,7 +746,10 @@ 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:
> No need to read the format here?
> format = v4l2_subdev_state_get_format(state, 0);
> > + cci_write(imx214->regmap, IMX214_REG_FRM_LENGTH_LINES,
> > + format->height + ctrl->val, &ret);
> > + break;
> > default:
> > ret = -EINVAL;
> > }
> > @@ -714,8 +772,11 @@ 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);
> > @@ -723,7 +784,7 @@ 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;
> >
> > @@ -749,12 +810,27 @@ static int imx214_ctrls_init(struct imx214 *imx214)
> > *
> > * Yours sincerely, Ricardo.
> > */
> > +
> > + /* 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,
> nit: I think it looks nicer with exposure_max in the next line, but
> ignore if you prefer this way :)
> > IMX214_EXPOSURE_STEP,
> > - IMX214_EXPOSURE_DEFAULT);
> > + exposure_def);
> >
> > imx214->unit_size = v4l2_ctrl_new_std_compound(ctrl_hdlr,
> > NULL,
> > @@ -876,6 +952,12 @@ 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.
> > + */
>
> Now that these controls are useless... maybe we can do a dev_warn_once
> when the user calls it to leave some output in dmesg?
> > static int imx214_enum_frame_interval(struct v4l2_subdev *subdev,
> > struct v4l2_subdev_state *sd_state,
> > struct v4l2_subdev_frame_interval_enum *fie)
> >
> > --
> > 2.47.1
> >
> >
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