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

   1 From e5390cad270d49f3b0dc0a03eccfef63ffa7520f Mon Sep 17 00:00:00 2001
   2 From: Naushir Patuck <naush@raspberrypi.com>
   3 Date: Tue, 8 Feb 2022 13:49:11 +0000
   4 Subject: [PATCH] media: i2c: imx219: Scale the pixel clock rate for
   5  the 640x480 mode
   6
   7 The 640x480 mode uses a special binning mode for high framerate operation where
   8 the pixel rate is effectively doubled. Account for this when setting up the
   9 pixel clock rate, and applying the vblank and exposure controls.
  10
  11 Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
  12 ---
  13  drivers/media/i2c/imx219.c | 33 ++++++++++++++++++++++++++-------
  14  1 file changed, 26 insertions(+), 7 deletions(-)
  15
  16 --- a/drivers/media/i2c/imx219.c
  17 +++ b/drivers/media/i2c/imx219.c
  18 @@ -164,6 +164,9 @@ struct imx219_mode {
  19
  20         /* 2x2 binning is used */
  21         bool binning;
  22 +
  23 +       /* Relative pixel clock rate factor for the mode. */
  24 +       unsigned int rate_factor;
  25  };
  26
  27  static const struct imx219_reg imx219_common_regs[] = {
  28 @@ -402,6 +405,7 @@ static const struct imx219_mode supporte
  29                         .regs = mode_3280x2464_regs,
  30                 },
  31                 .binning = false,
  32 +               .rate_factor = 1,
  33         },
  34         {
  35                 /* 1080P 30fps cropped */
  36 @@ -419,6 +423,7 @@ static const struct imx219_mode supporte
  37                         .regs = mode_1920_1080_regs,
  38                 },
  39                 .binning = false,
  40 +               .rate_factor = 1,
  41         },
  42         {
  43                 /* 2x2 binned 30fps mode */
  44 @@ -436,6 +441,7 @@ static const struct imx219_mode supporte
  45                         .regs = mode_1640_1232_regs,
  46                 },
  47                 .binning = true,
  48 +               .rate_factor = 1,
  49         },
  50         {
  51                 /* 640x480 30fps mode */
  52 @@ -453,6 +459,11 @@ static const struct imx219_mode supporte
  53                         .regs = mode_640_480_regs,
  54                 },
  55                 .binning = true,
  56 +               /*
  57 +                * This mode uses a special 2x2 binning that doubles the
  58 +                * internal pixel clock rate.
  59 +                */
  60 +               .rate_factor = 2,
  61         },
  62  };
  63
  64 @@ -675,7 +686,8 @@ static int imx219_set_ctrl(struct v4l2_c
  65                 break;
  66         case V4L2_CID_EXPOSURE:
  67                 ret = imx219_write_reg(imx219, IMX219_REG_EXPOSURE,
  68 -                                      IMX219_REG_VALUE_16BIT, ctrl->val);
  69 +                                      IMX219_REG_VALUE_16BIT,
  70 +                                      ctrl->val / imx219->mode->rate_factor);
  71                 break;
  72         case V4L2_CID_DIGITAL_GAIN:
  73                 ret = imx219_write_reg(imx219, IMX219_REG_DIGITAL_GAIN,
  74 @@ -695,7 +707,8 @@ static int imx219_set_ctrl(struct v4l2_c
  75         case V4L2_CID_VBLANK:
  76                 ret = imx219_write_reg(imx219, IMX219_REG_VTS,
  77                                        IMX219_REG_VALUE_16BIT,
  78 -                                      imx219->mode->height + ctrl->val);
  79 +                                      (imx219->mode->height + ctrl->val) /
  80 +                                               imx219->mode->rate_factor);
  81                 break;
  82         case V4L2_CID_HBLANK:
  83                 ret = imx219_write_reg(imx219, IMX219_REG_HTS,
  84 @@ -877,7 +890,7 @@ static int imx219_set_pad_format(struct
  85         struct imx219 *imx219 = to_imx219(sd);
  86         const struct imx219_mode *mode;
  87         struct v4l2_mbus_framefmt *framefmt;
  88 -       int exposure_max, exposure_def, hblank;
  89 +       int exposure_max, exposure_def, hblank, pixel_rate;
  90         unsigned int i;
  91
  92         if (fmt->pad >= NUM_PADS)
  93 @@ -942,6 +955,12 @@ static int imx219_set_pad_format(struct
  94                                                  1,
  95                                                  IMX219_PPL_MIN - mode->width);
  96                         __v4l2_ctrl_s_ctrl(imx219->hblank, hblank);
  97 +
  98 +                       /* Scale the pixel rate based on the mode specific factor */
  99 +                       pixel_rate =
 100 +                               IMX219_PIXEL_RATE * imx219->mode->rate_factor;
 101 +                       __v4l2_ctrl_modify_range(imx219->pixel_rate, pixel_rate,
 102 +                                                pixel_rate, 1, pixel_rate);
 103                 }
 104         } else {
 105                 if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
 106 @@ -1323,7 +1342,7 @@ static int imx219_init_controls(struct i
 107         struct v4l2_ctrl_handler *ctrl_hdlr;
 108         unsigned int height = imx219->mode->height;
 109         struct v4l2_fwnode_device_properties props;
 110 -       int exposure_max, exposure_def, hblank;
 111 +       int exposure_max, exposure_def, hblank, pixel_rate;
 112         int i, ret;
 113
 114         ctrl_hdlr = &imx219->ctrl_handler;
 115 @@ -1335,11 +1354,11 @@ static int imx219_init_controls(struct i
 116         ctrl_hdlr->lock = &imx219->mutex;
 117
 118         /* By default, PIXEL_RATE is read only */
 119 +       pixel_rate = IMX219_PIXEL_RATE * imx219->mode->rate_factor;
 120         imx219->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
 121                                                V4L2_CID_PIXEL_RATE,
 122 -                                              IMX219_PIXEL_RATE,
 123 -                                              IMX219_PIXEL_RATE, 1,
 124 -                                              IMX219_PIXEL_RATE);
 125 +                                              pixel_rate, pixel_rate,
 126 +                                              1, pixel_rate);
 127
 128         imx219->link_freq =
 129                 v4l2_ctrl_new_int_menu(ctrl_hdlr, &imx219_ctrl_ops,