target/linux/brcm2708/patches-4.19/950-0189-media-ov5647-Add-support-for-non-continuous-clock-mo.patch

   1 From db4060811ce6f11c7765201104292907d2e7a709 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Wed, 31 Oct 2018 14:56:47 +0000
   4 Subject: [PATCH 189/773] media: ov5647: Add support for non-continuous clock
   5  mode
   6
   7 The driver was only supporting continuous clock mode
   8 although this was not stated anywhere.
   9 Non-continuous clock saves a small amount of power and
  10 on some SoCs is easier to interface with.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  13 ---
  14  drivers/media/i2c/ov5647.c | 17 ++++++++++++++---
  15  1 file changed, 14 insertions(+), 3 deletions(-)
  16
  17 --- a/drivers/media/i2c/ov5647.c
  18 +++ b/drivers/media/i2c/ov5647.c
  19 @@ -44,6 +44,7 @@
  20  #define PWDN_ACTIVE_DELAY_MS   20
  21
  22  #define MIPI_CTRL00_CLOCK_LANE_GATE            BIT(5)
  23 +#define MIPI_CTRL00_LINE_SYNC_ENABLE           BIT(4)
  24  #define MIPI_CTRL00_BUS_IDLE                   BIT(2)
  25  #define MIPI_CTRL00_CLOCK_LANE_DISABLE         BIT(0)
  26
  27 @@ -95,6 +96,7 @@ struct ov5647 {
  28         int                             power_count;
  29         struct clk                      *xclk;
  30         struct gpio_desc                *pwdn;
  31 +       unsigned int                    flags;
  32  };
  33
  34  static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
  35 @@ -269,9 +271,15 @@ static int ov5647_set_virtual_channel(st
  36
  37  static int ov5647_stream_on(struct v4l2_subdev *sd)
  38  {
  39 +       struct ov5647 *ov5647 = to_state(sd);
  40 +       u8 val = MIPI_CTRL00_BUS_IDLE;
  41         int ret;
  42
  43 -       ret = ov5647_write(sd, OV5647_REG_MIPI_CTRL00, MIPI_CTRL00_BUS_IDLE);
  44 +       if (ov5647->flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK)
  45 +               val |= MIPI_CTRL00_CLOCK_LANE_GATE |
  46 +                      MIPI_CTRL00_LINE_SYNC_ENABLE;
  47 +
  48 +       ret = ov5647_write(sd, OV5647_REG_MIPI_CTRL00, val);
  49         if (ret < 0)
  50                 return ret;
  51
  52 @@ -568,7 +576,7 @@ static const struct v4l2_subdev_internal
  53         .open = ov5647_open,
  54  };
  55
  56 -static int ov5647_parse_dt(struct device_node *np)
  57 +static int ov5647_parse_dt(struct device_node *np, struct ov5647 *sensor)
  58  {
  59         struct v4l2_fwnode_endpoint bus_cfg;
  60         struct device_node *ep;
  61 @@ -581,6 +589,9 @@ static int ov5647_parse_dt(struct device
  62
  63         ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &bus_cfg);
  64
  65 +       if (!ret)
  66 +               sensor->flags = bus_cfg.bus.mipi_csi2.flags;
  67 +
  68         of_node_put(ep);
  69         return ret;
  70  }
  71 @@ -600,7 +611,7 @@ static int ov5647_probe(struct i2c_clien
  72                 return -ENOMEM;
  73
  74         if (IS_ENABLED(CONFIG_OF) && np) {
  75 -               ret = ov5647_parse_dt(np);
  76 +               ret = ov5647_parse_dt(np, sensor);
  77                 if (ret) {
  78                         dev_err(dev, "DT parsing error: %d\n", ret);
  79                         return ret;