Hi Jai
On Tue, Nov 18, 2025 at 05:33:09PM +0530, Jai Luthra wrote:
> From: Dave Stevenson <dave.stevenson@raspberrypi.com>
>
> The link frequency can vary between modes, so add it as a
> control.
>
> Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
> Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com>
> ---
> drivers/media/i2c/ov5647.c | 24 +++++++++++++++++++++++-
> 1 file changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
> index 71107d74f2900b39233a52b29a229282bd087963..de27e76b487957bfa0a072359f28194425950eaf 100644
> --- a/drivers/media/i2c/ov5647.c
> +++ b/drivers/media/i2c/ov5647.c
> @@ -97,6 +97,13 @@ static const char * const ov5647_supply_names[] = {
>
> #define OV5647_NUM_SUPPLIES ARRAY_SIZE(ov5647_supply_names)
>
> +#define FREQ_INDEX_FULL 0
> +#define FREQ_INDEX_VGA 1
> +static const s64 ov5647_link_freqs[] = {
> + [FREQ_INDEX_FULL] = 218750000,
> + [FREQ_INDEX_VGA] = 208333000,
> +};
> +
> struct regval_list {
> u16 addr;
> u8 data;
> @@ -106,6 +113,7 @@ struct ov5647_mode {
> struct v4l2_mbus_framefmt format;
> struct v4l2_rect crop;
> u64 pixel_rate;
> + unsigned int link_freq_index;
> int hts;
> int vts;
> const struct regval_list *reg_list;
> @@ -128,6 +136,7 @@ struct ov5647 {
> struct v4l2_ctrl *exposure;
> struct v4l2_ctrl *hflip;
> struct v4l2_ctrl *vflip;
> + struct v4l2_ctrl *link_freq;
> };
>
> static inline struct ov5647 *to_sensor(struct v4l2_subdev *sd)
> @@ -376,6 +385,7 @@ static const struct ov5647_mode ov5647_modes[] = {
> .height = 1944
> },
> .pixel_rate = 87500000,
> + .link_freq_index = FREQ_INDEX_FULL,
> .hts = 2844,
> .vts = 0x7b0,
> .reg_list = ov5647_2592x1944_10bpp,
> @@ -397,6 +407,7 @@ static const struct ov5647_mode ov5647_modes[] = {
> .height = 1080,
> },
> .pixel_rate = 87500000,
> + .link_freq_index = FREQ_INDEX_FULL,
> .hts = 2416,
> .vts = 0x450,
> .reg_list = ov5647_1080p30_10bpp,
> @@ -418,6 +429,7 @@ static const struct ov5647_mode ov5647_modes[] = {
> .height = 1944,
> },
> .pixel_rate = 87500000,
> + .link_freq_index = FREQ_INDEX_FULL,
> .hts = 1896,
> .vts = 0x59b,
> .reg_list = ov5647_2x2binned_10bpp,
> @@ -439,6 +451,7 @@ static const struct ov5647_mode ov5647_modes[] = {
> .height = 1920,
> },
> .pixel_rate = 55000000,
I now read again v1 13/13 and this mode seems to have a different pixel
rate and a lower link freq ?
> + .link_freq_index = FREQ_INDEX_VGA,
> .hts = 1852,
> .vts = 0x1f8,
> .reg_list = ov5647_640x480_10bpp,
> @@ -927,6 +940,8 @@ static int ov5647_set_pad_fmt(struct v4l2_subdev *sd,
> sensor->exposure->minimum,
> exposure_max, sensor->exposure->step,
> exposure_def);
> +
> + __v4l2_ctrl_s_ctrl(sensor->link_freq, mode->link_freq_index);
> }
> *fmt = mode->format;
> /* The code we pass back must reflect the current h/vflips. */
> @@ -1236,7 +1251,7 @@ static int ov5647_init_controls(struct ov5647 *sensor)
> int hblank, exposure_max, exposure_def;
> struct device *dev = &client->dev;
>
> - v4l2_ctrl_handler_init(&sensor->ctrls, 13);
> + v4l2_ctrl_handler_init(&sensor->ctrls, 14);
>
> v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
> V4L2_CID_AUTOGAIN, 0, 1, 1, 0);
> @@ -1292,6 +1307,13 @@ static int ov5647_init_controls(struct ov5647 *sensor)
> sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
> V4L2_CID_VFLIP, 0, 1, 1, 0);
>
> + sensor->link_freq =
> + v4l2_ctrl_new_int_menu(&sensor->ctrls, NULL, V4L2_CID_LINK_FREQ,
> + ARRAY_SIZE(ov5647_link_freqs) - 1, 0,
The default control value should follow the default mode.
You can use mode->link_req_index to retrieve it
> + ov5647_link_freqs);
> + if (sensor->link_freq)
> + sensor->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> v4l2_fwnode_device_parse(dev, &props);
>
> v4l2_ctrl_new_fwnode_properties(&sensor->ctrls, &ov5647_ctrl_ops,
>
> --
> 2.51.1
>