target/linux/bcm27xx/patches-5.4/950-0654-media-i2c-imx219-Fix-power-sequence.patch

   1 From 0fec1c81707f5335d0b04b5e97d2ddd0b902377b Mon Sep 17 00:00:00 2001
   2 From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
   3 Date: Tue, 10 Mar 2020 14:17:07 +0100
   4 Subject: [PATCH] media: i2c: imx219: Fix power sequence
   5
   6 Commit ca45448a56659c6df6e0436188e97f6cc65dea8a upstream.
   7
   8 When supporting Rpi Camera v2 Module on the RZ/G2E, found the driver had
   9 some issues with rcar mipi-csi driver. The sensor never entered into LP-11
  10 state.
  11
  12 The powerup sequence in the datasheet[1] shows the sensor entering into
  13 LP-11 in streaming mode, so to fix this issue transitions are performed
  14 from "streaming -> standby" in the probe() after power up.
  15
  16 With this commit the sensor is able to enter LP-11 mode during power up,
  17 as expected by some CSI-2 controllers.
  18
  19 [1] https://publiclab.org/system/images/photos/000/023/294/original/
  20 RASPBERRY_PI_CAMERA_V2_DATASHEET_IMX219PQH5_7.0.0_Datasheet_XXX.PDF
  21
  22 Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
  23 Acked-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  24 Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
  25 Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
  26 ---
  27  drivers/media/i2c/imx219.c | 17 +++++++++++++++++
  28  1 file changed, 17 insertions(+)
  29
  30 --- a/drivers/media/i2c/imx219.c
  31 +++ b/drivers/media/i2c/imx219.c
  32 @@ -1224,6 +1224,23 @@ static int imx219_probe(struct i2c_clien
  33         /* Set default mode to max resolution */
  34         imx219->mode = &supported_modes[0];
  35
  36 +       /* sensor doesn't enter LP-11 state upon power up until and unless
  37 +        * streaming is started, so upon power up switch the modes to:
  38 +        * streaming -> standby
  39 +        */
  40 +       ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
  41 +                              IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
  42 +       if (ret < 0)
  43 +               goto error_power_off;
  44 +       usleep_range(100, 110);
  45 +
  46 +       /* put sensor back to standby mode */
  47 +       ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
  48 +                              IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY);
  49 +       if (ret < 0)
  50 +               goto error_power_off;
  51 +       usleep_range(100, 110);
  52 +
  53         ret = imx219_init_controls(imx219);
  54         if (ret)
  55                 goto error_power_off;