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

   1 From d5517d71c77ba67cb9dc1985a649ff11017eca0e Mon Sep 17 00:00:00 2001
   2 From: Naushir Patuck <naush@raspberrypi.com>
   3 Date: Wed, 10 Feb 2021 10:18:53 +0000
   4 Subject: [PATCH] media: i2c: imx477: Remove auto frame length
   5  adjusting
   6
   7 The V4L2_CID_EXPOSURE_AUTO_PRIORITY was used to let the sensor control
   8 frame length (effectively framerate) based on the requested exposure
   9 time requested. Remove this feature as it is never used, and goes
  10 against how V4L2 likes to handle exposure and vblank controls.
  11
  12 Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
  13 ---
  14  drivers/media/i2c/imx477.c | 83 +++-----------------------------------
  15  1 file changed, 6 insertions(+), 77 deletions(-)
  16
  17 --- a/drivers/media/i2c/imx477.c
  18 +++ b/drivers/media/i2c/imx477.c
  19 @@ -1082,8 +1082,6 @@ struct imx477 {
  20         struct v4l2_ctrl *hflip;
  21         struct v4l2_ctrl *vblank;
  22         struct v4l2_ctrl *hblank;
  23 -       /* This ctrl allows automatic variable framerate */
  24 -       struct v4l2_ctrl *exposure_auto;
  25
  26         /* Current mode */
  27         const struct imx477_mode *mode;
  28 @@ -1280,66 +1278,14 @@ static int imx477_open(struct v4l2_subde
  29         return 0;
  30  }
  31
  32 -static int imx477_set_exposure(struct imx477 *imx477, unsigned int val)
  33 -{
  34 -       int ret;
  35 -
  36 -       ret = imx477_write_reg(imx477, IMX477_REG_EXPOSURE,
  37 -                              IMX477_REG_VALUE_16BIT, val);
  38 -
  39 -       /* Setup the frame length in the case of auto framerate mode. */
  40 -       if (imx477->exposure_auto->val) {
  41 -               unsigned int frame_length, frame_length_max, frame_length_min;
  42 -
  43 -               frame_length_min = imx477->vblank->minimum +
  44 -                                  imx477->mode->height;
  45 -               frame_length_max = imx477->vblank->maximum +
  46 -                                  imx477->mode->height;
  47 -               frame_length = max(frame_length_min,
  48 -                                  val + IMX477_EXPOSURE_OFFSET);
  49 -               frame_length = min(frame_length_max, frame_length);
  50 -               ret += imx477_write_reg(imx477, IMX477_REG_FRAME_LENGTH,
  51 -                                       IMX477_REG_VALUE_16BIT, frame_length);
  52 -       }
  53 -
  54 -       return ret;
  55 -}
  56 -
  57  static void imx477_adjust_exposure_range(struct imx477 *imx477,
  58                                          struct v4l2_ctrl *ctrl)
  59  {
  60         int exposure_max, exposure_def;
  61
  62 -       if (ctrl->id == V4L2_CID_VBLANK || !ctrl->val) {
  63 -               /*
  64 -                * Either VBLANK has been changed or auto framerate
  65 -                * adjusting has been disabled. Honour the VBLANK limits
  66 -                * when setting exposure.
  67 -                */
  68 -               exposure_max = imx477->mode->height + imx477->vblank->val -
  69 -                                                     IMX477_EXPOSURE_OFFSET;
  70 -
  71 -               if (ctrl->id == V4L2_CID_EXPOSURE_AUTO_PRIORITY) {
  72 -                       /*
  73 -                        * Allow VBLANK adjustments since the driver is not
  74 -                        * handling frame length control automatically.
  75 -                        */
  76 -                       __v4l2_ctrl_grab(imx477->vblank, false);
  77 -               }
  78 -       } else {
  79 -               /*
  80 -                * Auto framerate adjusting has been enabled. VBLANK
  81 -                * ctrl has been disabled and exposure can ramp up
  82 -                * to the maximum allowable value.
  83 -                */
  84 -               exposure_max = IMX477_EXPOSURE_MAX;
  85 -               /*
  86 -                * Do not allow VBLANK adjustments if the driver is
  87 -                * handling it frame length control automatically.
  88 -                */
  89 -               __v4l2_ctrl_grab(imx477->vblank, true);
  90 -       }
  91 -
  92 +       /* Honour the VBLANK limits when setting exposure. */
  93 +       exposure_max = imx477->mode->height + imx477->vblank->val -
  94 +                                               IMX477_EXPOSURE_OFFSET;
  95         exposure_def = min(exposure_max, imx477->exposure->val);
  96         __v4l2_ctrl_modify_range(imx477->exposure, imx477->exposure->minimum,
  97                                  exposure_max, imx477->exposure->step,
  98 @@ -1353,14 +1299,8 @@ static int imx477_set_ctrl(struct v4l2_c
  99         struct i2c_client *client = v4l2_get_subdevdata(&imx477->sd);
 100         int ret = 0;
 101
 102 -       if (ctrl->id == V4L2_CID_VBLANK ||
 103 -           ctrl->id == V4L2_CID_EXPOSURE_AUTO_PRIORITY) {
 104 -               /*
 105 -                * These controls may change the limits of usable exposure,
 106 -                * so check and adjust if necessary.
 107 -                */
 108 +       if (ctrl->id == V4L2_CID_VBLANK)
 109                 imx477_adjust_exposure_range(imx477, ctrl);
 110 -       }
 111
 112         /*
 113          * Applying V4L2 control value only happens
 114 @@ -1375,14 +1315,8 @@ static int imx477_set_ctrl(struct v4l2_c
 115                                        IMX477_REG_VALUE_16BIT, ctrl->val);
 116                 break;
 117         case V4L2_CID_EXPOSURE:
 118 -               ret = imx477_set_exposure(imx477, ctrl->val);
 119 -               break;
 120 -       case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
 121 -               /*
 122 -                * imx477_set_exposure() will recalculate the frame length
 123 -                * to adjust the framerate to match the exposure.
 124 -                */
 125 -               ret = imx477_set_exposure(imx477, imx477->exposure->val);
 126 +               ret = imx477_write_reg(imx477, IMX477_REG_EXPOSURE,
 127 +                                      IMX477_REG_VALUE_16BIT, ctrl->val);
 128                 break;
 129         case V4L2_CID_DIGITAL_GAIN:
 130                 ret = imx477_write_reg(imx477, IMX477_REG_DIGITAL_GAIN,
 131 @@ -2005,11 +1939,6 @@ static int imx477_init_controls(struct i
 132                           IMX477_DGTL_GAIN_MIN, IMX477_DGTL_GAIN_MAX,
 133                           IMX477_DGTL_GAIN_STEP, IMX477_DGTL_GAIN_DEFAULT);
 134
 135 -       imx477->exposure_auto =
 136 -                       v4l2_ctrl_new_std(ctrl_hdlr, &imx477_ctrl_ops,
 137 -                                         V4L2_CID_EXPOSURE_AUTO_PRIORITY,
 138 -                                         0, 1, 1, 0);
 139 -
 140         imx477->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx477_ctrl_ops,
 141                                           V4L2_CID_HFLIP, 0, 1, 1, 0);
 142         if (imx477->hflip)