From 421e9f60f24504de605c7bc4ba98e51b73b2aa6d Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Thu, 16 Feb 2023 00:29:58 +0200 Subject: [PATCH] media: i2c: imx290: Convert V4L2_CID_VBLANK to read/write Should be upstream commit 97792a11021b The driver exposed V4L2_CID_VBLANK as a read only control to allow for exposure calculations and determination of the frame rate. Convert to a read/write control so that the frame rate can be controlled. V4L2_CID_VBLANK also sets the limits for the exposure control, therefore exposure ranges have to be updated when vblank changes (either via s_ctrl, or via changing mode). Signed-off-by: Dave Stevenson Reviewed-by: Laurent Pinchart Signed-off-by: Laurent Pinchart Acked-by: Alexander Stein Signed-off-by: Sakari Ailus --- drivers/media/i2c/imx290.c | 58 +++++++++++++++++++++++++++++++------- 1 file changed, 48 insertions(+), 10 deletions(-) --- a/drivers/media/i2c/imx290.c +++ b/drivers/media/i2c/imx290.c @@ -49,6 +49,7 @@ #define IMX290_BLKLEVEL IMX290_REG_16BIT(0x300a) #define IMX290_GAIN IMX290_REG_8BIT(0x3014) #define IMX290_VMAX IMX290_REG_24BIT(0x3018) +#define IMX290_VMAX_MAX 0x3ffff #define IMX290_HMAX IMX290_REG_16BIT(0x301c) #define IMX290_HMAX_MAX 0xffff #define IMX290_SHS1 IMX290_REG_24BIT(0x3020) @@ -109,6 +110,9 @@ #define IMX290_PGCTRL_THRU BIT(1) #define IMX290_PGCTRL_MODE(n) ((n) << 4) +/* Number of lines by which exposure must be less than VMAX */ +#define IMX290_EXPOSURE_OFFSET 2 + #define IMX290_VMAX_DEFAULT 1125 #define IMX290_PIXEL_RATE 148500000 @@ -225,6 +229,7 @@ struct imx290 { struct v4l2_ctrl *link_freq; struct v4l2_ctrl *hblank; struct v4l2_ctrl *vblank; + struct v4l2_ctrl *exposure; }; static inline struct imx290 *to_imx290(struct v4l2_subdev *_sd) @@ -238,7 +243,6 @@ static inline struct imx290 *to_imx290(s static const struct imx290_regval imx290_global_init_settings[] = { { IMX290_CTRL_07, IMX290_WINMODE_1080P }, - { IMX290_VMAX, IMX290_VMAX_DEFAULT }, { IMX290_EXTCK_FREQ, 0x2520 }, { IMX290_WINWV_OB, 12 }, { IMX290_WINPH, 0 }, @@ -664,6 +668,16 @@ static int imx290_setup_format(struct im /* ---------------------------------------------------------------------------- * Controls */ +static void imx290_exposure_update(struct imx290 *imx290, + const struct imx290_mode *mode) +{ + unsigned int exposure_max; + + exposure_max = imx290->vblank->val + mode->height - + IMX290_EXPOSURE_OFFSET; + __v4l2_ctrl_modify_range(imx290->exposure, 1, exposure_max, 1, + exposure_max); +} static int imx290_set_ctrl(struct v4l2_ctrl *ctrl) { @@ -671,7 +685,7 @@ static int imx290_set_ctrl(struct v4l2_c struct imx290, ctrls); const struct v4l2_mbus_framefmt *format; struct v4l2_subdev_state *state; - int ret = 0; + int ret = 0, vmax; /* * Return immediately for controls that don't need to be applied to the @@ -680,6 +694,11 @@ static int imx290_set_ctrl(struct v4l2_c if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY) return 0; + if (ctrl->id == V4L2_CID_VBLANK) { + /* Changing vblank changes the allowed range for exposure. */ + imx290_exposure_update(imx290, imx290->current_mode); + } + /* V4L2 controls values will be applied only when power is already up */ if (!pm_runtime_get_if_in_use(imx290->dev)) return 0; @@ -692,9 +711,23 @@ static int imx290_set_ctrl(struct v4l2_c ret = imx290_write(imx290, IMX290_GAIN, ctrl->val, NULL); break; + case V4L2_CID_VBLANK: + ret = imx290_write(imx290, IMX290_VMAX, + ctrl->val + imx290->current_mode->height, + NULL); + /* + * Due to the way that exposure is programmed in this sensor in + * relation to VMAX, we have to reprogramme it whenever VMAX is + * changed. + * Update ctrl so that the V4L2_CID_EXPOSURE case can refer to + * it. + */ + ctrl = imx290->exposure; + fallthrough; case V4L2_CID_EXPOSURE: + vmax = imx290->vblank->val + imx290->current_mode->height; ret = imx290_write(imx290, IMX290_SHS1, - IMX290_VMAX_DEFAULT - ctrl->val - 1, NULL); + vmax - ctrl->val - 1, NULL); break; case V4L2_CID_TEST_PATTERN: @@ -751,13 +784,15 @@ static void imx290_ctrl_update(struct im { unsigned int hblank_min = mode->hmax_min - mode->width; unsigned int hblank_max = IMX290_HMAX_MAX - mode->width; - unsigned int vblank = IMX290_VMAX_DEFAULT - mode->height; + unsigned int vblank_min = IMX290_VMAX_DEFAULT - mode->height; + unsigned int vblank_max = IMX290_VMAX_MAX - mode->height; __v4l2_ctrl_s_ctrl(imx290->link_freq, mode->link_freq_index); __v4l2_ctrl_modify_range(imx290->hblank, hblank_min, hblank_max, 1, hblank_min); - __v4l2_ctrl_modify_range(imx290->vblank, vblank, vblank, 1, vblank); + __v4l2_ctrl_modify_range(imx290->vblank, vblank_min, vblank_max, 1, + vblank_min); } static int imx290_ctrl_init(struct imx290 *imx290) @@ -787,9 +822,13 @@ static int imx290_ctrl_init(struct imx29 v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops, V4L2_CID_ANALOGUE_GAIN, 0, 100, 1, 0); - v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops, - V4L2_CID_EXPOSURE, 1, IMX290_VMAX_DEFAULT - 2, 1, - IMX290_VMAX_DEFAULT - 2); + /* + * Correct range will be determined through imx290_ctrl_update setting + * V4L2_CID_VBLANK. + */ + imx290->exposure = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops, + V4L2_CID_EXPOSURE, 1, 65535, 1, + 65535); /* * Set the link frequency, pixel rate, horizontal blanking and vertical @@ -821,8 +860,6 @@ static int imx290_ctrl_init(struct imx29 imx290->vblank = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops, V4L2_CID_VBLANK, 1, 1, 1, 1); - if (imx290->vblank) - imx290->vblank->flags |= V4L2_CTRL_FLAG_READ_ONLY; v4l2_ctrl_new_fwnode_properties(&imx290->ctrls, &imx290_ctrl_ops, &props); @@ -1008,6 +1045,7 @@ static int imx290_set_fmt(struct v4l2_su imx290->current_mode = mode; imx290_ctrl_update(imx290, &fmt->format, mode); + imx290_exposure_update(imx290, mode); } *format = fmt->format;