git.openwrt.org Git - openwrt/staging/jow.git/blob

   1 From c92b64465d1f6dbfaf189dbf68128ec52fcb0521 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Thu, 30 Apr 2020 11:03:00 +0100
   4 Subject: [PATCH] media: i2c: ov5647: Advertise the correct exposure
   5  range
   6
   7 Exposure is clipped by the VTS of the mode, so needs to be updated as
   8 and when this is changed.
   9
  10 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  11 ---
  12  drivers/media/i2c/ov5647.c | 47 +++++++++++++++++++++++++++++++-------
  13  1 file changed, 39 insertions(+), 8 deletions(-)
  14
  15 --- a/drivers/media/i2c/ov5647.c
  16 +++ b/drivers/media/i2c/ov5647.c
  17 @@ -84,6 +84,11 @@
  18  #define OV5647_VBLANK_MIN              4
  19  #define OV5647_VTS_MAX                 32767
  20
  21 +#define OV5647_EXPOSURE_MIN            4
  22 +#define OV5647_EXPOSURE_STEP           1
  23 +#define OV5647_EXPOSURE_DEFAULT                1000
  24 +#define OV5647_EXPOSURE_MAX            65535
  25 +
  26  struct regval_list {
  27         u16 addr;
  28         u8 data;
  29 @@ -117,6 +122,7 @@ struct ov5647 {
  30         struct v4l2_ctrl                *pixel_rate;
  31         struct v4l2_ctrl                *hblank;
  32         struct v4l2_ctrl                *vblank;
  33 +       struct v4l2_ctrl                *exposure;
  34         bool                            write_mode_regs;
  35  };
  36
  37 @@ -1202,7 +1208,7 @@ static int ov5647_set_fmt(struct v4l2_su
  38                  * If we have changed modes, write the I2C register list on
  39                  * a stream_on().
  40                  */
  41 -               int hblank;
  42 +               int exposure_max, exposure_def, hblank;
  43
  44                 if (state->mode != mode)
  45                         state->write_mode_regs = true;
  46 @@ -1223,6 +1229,15 @@ static int ov5647_set_fmt(struct v4l2_su
  47                                          mode->vts_def - mode->format.height);
  48                 __v4l2_ctrl_s_ctrl(state->vblank,
  49                                    mode->vts_def - mode->format.height);
  50 +
  51 +               exposure_max = mode->vts_def - 4;
  52 +               exposure_def = (exposure_max < OV5647_EXPOSURE_DEFAULT) ?
  53 +                                       exposure_max : OV5647_EXPOSURE_DEFAULT;
  54 +               __v4l2_ctrl_modify_range(state->exposure,
  55 +                                        state->exposure->minimum,
  56 +                                        exposure_max,
  57 +                                        state->exposure->step,
  58 +                                        exposure_def);
  59         }
  60
  61         mutex_unlock(&state->lock);
  62 @@ -1415,6 +1430,19 @@ static int ov5647_s_ctrl(struct v4l2_ctr
  63
  64         /* v4l2_ctrl_lock() locks our own mutex */
  65
  66 +       if (ctrl->id == V4L2_CID_VBLANK) {
  67 +               int exposure_max, exposure_def;
  68 +
  69 +               /* Update max exposure while meeting expected vblanking */
  70 +               exposure_max = state->mode->format.height + ctrl->val - 4;
  71 +               exposure_def = (exposure_max < OV5647_EXPOSURE_DEFAULT) ?
  72 +                       exposure_max : OV5647_EXPOSURE_DEFAULT;
  73 +               __v4l2_ctrl_modify_range(state->exposure,
  74 +                                        state->exposure->minimum,
  75 +                                        exposure_max, state->exposure->step,
  76 +                                        exposure_def);
  77 +       }
  78 +
  79         /*
  80          * If the device is not powered up by the host driver do
  81          * not apply any controls to H/W at this time. Instead
  82 @@ -1472,7 +1500,7 @@ static int ov5647_probe(struct i2c_clien
  83         struct v4l2_subdev *sd;
  84         struct device_node *np = client->dev.of_node;
  85         u32 xclk_freq;
  86 -       int hblank;
  87 +       int hblank, exposure_max, exposure_def;
  88
  89         sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
  90         if (!sensor)
  91 @@ -1525,12 +1553,6 @@ static int ov5647_probe(struct i2c_clien
  92                                0,                     /* skip_mask */
  93                                V4L2_EXPOSURE_MANUAL); /* default */
  94         v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
  95 -                         V4L2_CID_EXPOSURE,
  96 -                         4,     /* min lines */
  97 -                         65535, /* max lines (4+8+4 bits)*/
  98 -                         1,     /* step */
  99 -                         1000); /* default number of lines */
 100 -       v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
 101                           V4L2_CID_ANALOGUE_GAIN,
 102                           16,   /* min, 16 = 1.0x */
 103                           1023, /* max (10 bits) */
 104 @@ -1540,6 +1562,15 @@ static int ov5647_probe(struct i2c_clien
 105         /* Set the default mode before we init the subdev */
 106         sensor->mode = OV5647_DEFAULT_MODE;
 107
 108 +       exposure_max = sensor->mode->vts_def - 4;
 109 +       exposure_def = (exposure_max < OV5647_EXPOSURE_DEFAULT) ?
 110 +               exposure_max : OV5647_EXPOSURE_DEFAULT;
 111 +       sensor->exposure = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
 112 +                                            V4L2_CID_EXPOSURE,
 113 +                                            OV5647_EXPOSURE_MIN, exposure_max,
 114 +                                            OV5647_EXPOSURE_STEP,
 115 +                                            exposure_def);
 116 +
 117         /* By default, PIXEL_RATE is read only, but it does change per mode */
 118         sensor->pixel_rate = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
 119                                                V4L2_CID_PIXEL_RATE,