Hi Jacopo
On Sat, 22 Oct 2022 at 11:20, Jacopo Mondi <jacopo@xxxxxxxxxx> wrote:
>
> Adjust the control limits for V4L2_CID_VBLANK, V4L2_CID_HBLANK and
> V4L2_CID_EXPOSURE when a new format is applied to the sensor.
>
> Also update the exposure control when a new blanking value is applied.
>
> Also change the controls initialization to use valid values for the
> default format.
>
> Signed-off-by: Jacopo Mondi <jacopo@xxxxxxxxxx>
> ---
> drivers/media/i2c/ar0521.c | 79 ++++++++++++++++++++++++++++----------
> 1 file changed, 59 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/media/i2c/ar0521.c b/drivers/media/i2c/ar0521.c
> index 2310346f11d5..854f4ccd9c3d 100644
> --- a/drivers/media/i2c/ar0521.c
> +++ b/drivers/media/i2c/ar0521.c
> @@ -40,7 +40,8 @@
>
> #define AR0521_WIDTH_BLANKING_MIN 572u
> #define AR0521_HEIGHT_BLANKING_MIN 38u /* must be even */
> -#define AR0521_TOTAL_WIDTH_MIN 2968u
> +#define AR0521_TOTAL_HEIGHT_MAX 65535u /* max_frame_lenght_lines */
s/max_frame_lenght_lines/max_frame_length_lines
> +#define AR0521_TOTAL_WIDTH_MAX 65532u /* max_line_lenght_pck */
s/max_line_lenght_pck /max_line_length_pck
>
> #define AR0521_ANA_GAIN_MIN 0x00
> #define AR0521_ANA_GAIN_MAX 0x3f
> @@ -125,8 +126,6 @@ struct ar0521_dev {
> struct v4l2_mbus_framefmt fmt;
> struct ar0521_ctrls ctrls;
> unsigned int lane_count;
> - u16 total_width;
> - u16 total_height;
> struct {
> u16 pre;
> u16 mult;
> @@ -483,7 +482,8 @@ static int ar0521_set_fmt(struct v4l2_subdev *sd,
> struct v4l2_subdev_format *format)
> {
> struct ar0521_dev *sensor = to_ar0521_dev(sd);
> - int ret = 0;
> + int exposure_max, exposure_val;
> + int max_vblank, max_hblank;
>
> ar0521_adj_fmt(&format->format);
>
> @@ -494,33 +494,64 @@ static int ar0521_set_fmt(struct v4l2_subdev *sd,
>
> fmt = v4l2_subdev_get_try_format(sd, sd_state, 0 /* pad */);
> *fmt = format->format;
> - } else {
> - sensor->fmt = format->format;
> - ar0521_calc_mode(sensor);
> +
> + mutex_unlock(&sensor->lock);
> +
> + return 0;
> }
>
> + sensor->fmt = format->format;
> + ar0521_calc_mode(sensor);
> +
> + /*
> + * Update the exposure and blankings limits. Blankings are also reset
> + * to the minimum.
> + */
> + max_hblank = AR0521_TOTAL_WIDTH_MAX - sensor->fmt.width;
> + __v4l2_ctrl_modify_range(sensor->ctrls.hblank,
> + sensor->ctrls.hblank->minimum,
> + max_hblank, sensor->ctrls.hblank->step,
> + sensor->ctrls.hblank->minimum);
__v4l2_ctrl_modify_range does return an error code. Is there any value
in checking it?
The only time I've really seen it return an error is when the code is
messed up and the default provided is out of range, but that would be
a driver bug and not something caused by userspace.
It looks like the rest of the code is correct, but I haven't had time
to follow it completely. I'll try and do that tomorrow.
Dave
> + __v4l2_ctrl_s_ctrl(sensor->ctrls.vblank, sensor->ctrls.hblank->minimum);
> +
> + max_vblank = AR0521_TOTAL_HEIGHT_MAX - sensor->fmt.height;
> + __v4l2_ctrl_modify_range(sensor->ctrls.vblank,
> + sensor->ctrls.vblank->minimum,
> + max_vblank, sensor->ctrls.vblank->step,
> + sensor->ctrls.vblank->minimum);
> + __v4l2_ctrl_s_ctrl(sensor->ctrls.vblank, sensor->ctrls.vblank->minimum);
> +
> + exposure_max = sensor->fmt.height + AR0521_HEIGHT_BLANKING_MIN - 4;
> + exposure_val = min(sensor->ctrls.exposure->val, exposure_max);
> + __v4l2_ctrl_modify_range(sensor->ctrls.exposure,
> + sensor->ctrls.exposure->minimum,
> + exposure_max, sensor->ctrls.exposure->step,
> + exposure_val);
> + __v4l2_ctrl_s_ctrl(sensor->ctrls.exposure, exposure_val);
> +
> mutex_unlock(&sensor->lock);
> - return ret;
> +
> + return 0;
> }
>
> static int ar0521_s_ctrl(struct v4l2_ctrl *ctrl)
> {
> struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
> struct ar0521_dev *sensor = to_ar0521_dev(sd);
> + int exp_max;
> + int exp_val;
> int ret;
>
> /* v4l2_ctrl_lock() locks our own mutex */
>
> switch (ctrl->id) {
> - case V4L2_CID_HBLANK:
> case V4L2_CID_VBLANK:
> - sensor->total_width = sensor->fmt.width +
> - sensor->ctrls.hblank->val;
> - sensor->total_height = sensor->fmt.width +
> - sensor->ctrls.vblank->val;
> - break;
> - default:
> - ret = -EINVAL;
> + exp_max = sensor->fmt.height + ctrl->val - 4;
> + exp_val = min(sensor->ctrls.exposure->val, exp_max);
> + __v4l2_ctrl_modify_range(sensor->ctrls.exposure,
> + sensor->ctrls.exposure->minimum,
> + exp_max, sensor->ctrls.exposure->step,
> + exp_val);
> break;
> }
>
> @@ -584,6 +615,7 @@ static int ar0521_init_controls(struct ar0521_dev *sensor)
> const struct v4l2_ctrl_ops *ops = &ar0521_ctrl_ops;
> struct ar0521_ctrls *ctrls = &sensor->ctrls;
> struct v4l2_ctrl_handler *hdl = &ctrls->handler;
> + int max_vblank, max_hblank, exposure_max;
> int ret;
>
> v4l2_ctrl_handler_init(hdl, 32);
> @@ -604,11 +636,17 @@ static int ar0521_init_controls(struct ar0521_dev *sensor)
> -512, 511, 1, 0);
> v4l2_ctrl_cluster(3, &ctrls->gain);
>
> + /* Initialize blanking limits using the default 2592x1944 format. */
> + max_hblank = AR0521_TOTAL_WIDTH_MAX - AR0521_WIDTH_MAX;
> ctrls->hblank = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HBLANK,
> - AR0521_WIDTH_BLANKING_MIN, 4094, 1,
> + AR0521_WIDTH_BLANKING_MIN,
> + max_hblank, 1,
> AR0521_WIDTH_BLANKING_MIN);
> +
> + max_vblank = AR0521_TOTAL_HEIGHT_MAX - AR0521_HEIGHT_MAX;
> ctrls->vblank = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VBLANK,
> - AR0521_HEIGHT_BLANKING_MIN, 4094, 2,
> + AR0521_HEIGHT_BLANKING_MIN,
> + max_vblank, 2,
> AR0521_HEIGHT_BLANKING_MIN);
> v4l2_ctrl_cluster(2, &ctrls->hblank);
>
> @@ -618,9 +656,10 @@ static int ar0521_init_controls(struct ar0521_dev *sensor)
> AR0521_PIXEL_CLOCK_MAX, 1,
> AR0521_PIXEL_CLOCK_RATE);
>
> - /* Manual exposure time */
> + /* Manual exposure time: max exposure time = visible + blank - 4 */
> + exposure_max = AR0521_HEIGHT_MAX + AR0521_HEIGHT_BLANKING_MIN - 4;
> ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE, 0,
> - 65535, 1, 360);
> + exposure_max, 1, 360);
>
> v4l2_ctrl_new_int_menu(hdl, ops, V4L2_CID_LINK_FREQ,
> ARRAY_SIZE(ar0521_link_frequencies) - 1,
> --
> 2.37.3
>
