media: ov5640: add PIXEL_RATE control

Add v4l2 controls to report the pixel rates of each mode. This is
needed by some CSI2 receiver in order to perform proper DPHY
configuration.

Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 500d9bbff10b5038cd4350432402db58e94c11d8..b93b61baace5163008441cf8ba1352f2b4918f39 100644 (file)
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -193,6 +193,7 @@ struct ov5640_mode_info {
 
 struct ov5640_ctrls {
        struct v4l2_ctrl_handler handler;
+       struct v4l2_ctrl *pixel_rate;
        struct {
                struct v4l2_ctrl *auto_exp;
                struct v4l2_ctrl *exposure;
@@ -1614,6 +1615,16 @@ ov5640_find_mode(struct ov5640_dev *sensor, enum ov5640_frame_rate fr,
        return mode;
 }
 
+static u64 ov5640_calc_pixel_rate(struct ov5640_dev *sensor)
+{
+       u64 rate;
+
+       rate = sensor->current_mode->vtot * sensor->current_mode->htot;
+       rate *= ov5640_framerates[sensor->current_fr];
+
+       return rate;
+}
+
 /*
  * sensor changes between scaling and subsampling, go through
  * exposure calculation
@@ -1818,8 +1829,7 @@ static int ov5640_set_mode(struct ov5640_dev *sensor)
         * All the formats we support have 16 bits per pixel, seems to require
         * the same rate than YUV, so we can just use 16 bpp all the time.
         */
-       rate = mode->vtot * mode->htot * 16;
-       rate *= ov5640_framerates[sensor->current_fr];
+       rate = ov5640_calc_pixel_rate(sensor) * 16;
        if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
                rate = rate / sensor->ep.bus.mipi_csi2.num_data_lanes;
                ret = ov5640_set_mipi_pclk(sensor, rate);
@@ -2233,6 +2243,8 @@ static int ov5640_set_fmt(struct v4l2_subdev *sd,
        if (mbus_fmt->code != sensor->fmt.code)
                sensor->pending_fmt_change = true;
 
+       __v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate,
+                                ov5640_calc_pixel_rate(sensor));
 out:
        mutex_unlock(&sensor->lock);
        return ret;
@@ -2657,6 +2669,11 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
        /* we can use our own mutex for the ctrl lock */
        hdl->lock = &sensor->lock;
 
+       /* Clock related controls */
+       ctrls->pixel_rate = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE,
+                                             0, INT_MAX, 1,
+                                             ov5640_calc_pixel_rate(sensor));
+
        /* Auto/manual white balance */
        ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
                                           V4L2_CID_AUTO_WHITE_BALANCE,
@@ -2704,6 +2721,7 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
                goto free_ctrls;
        }
 
+       ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
        ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
        ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
 
@@ -2816,6 +2834,9 @@ static int ov5640_s_frame_interval(struct v4l2_subdev *sd,
                sensor->frame_interval = fi->interval;
                sensor->current_mode = mode;
                sensor->pending_mode_change = true;
+
+               __v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate,
+                                        ov5640_calc_pixel_rate(sensor));
        }
 out:
        mutex_unlock(&sensor->lock);