Re: [PATCH v3 2/2] media: i2c: add support for OV4689

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Le 28/09/2022 à 00:21, Mikhail Rudenko a écrit :
Add a V4L2 sub-device driver for OmniVision OV4689 image sensor. This
is a 4 Mpx image sensor using the I2C bus for control and the CSI-2
bus for data.

This driver supports following features:
- manual exposure and analog gain control support
- test pattern support
- media controller support
- runtime PM support
- support following resolutions:
   + 2688x1520 at 30 fps

The driver provides all mandatory V4L2 controls for compatibility with
libcamera. The sensor supports 1/2/4-lane CSI-2 modes, but the driver
implements 4 lane mode only at this moment.

Hi,

a few nitpick below.

CJ


Signed-off-by: Mikhail Rudenko <mike.rudenko-Re5JQEeQqe8AvxtiuMwx3w@xxxxxxxxxxxxxxxx>
---

[...]

+static int ov4689_check_sensor_id(struct ov4689 *ov4689,
+				  struct i2c_client *client)
+{
+	struct device *dev = &ov4689->client->dev;
+	u32 id = 0;
+	int ret;
+
+	ret = ov4689_read_reg(client, OV4689_REG_CHIP_ID,
+			      OV4689_REG_VALUE_16BIT, &id);
+	if (id != CHIP_ID) {
+		dev_err(dev, "Unexpected sensor id(%06x), ret(%d)\n", id, ret);
+		return -ENODEV;

return ret?
(otherwise what is the point of -EINVAL and -EIO in ov4689_read_reg()?)

+	}
+
+	dev_info(dev, "Detected OV%06x sensor\n", CHIP_ID);
+
+	return 0;
+}

[...]

+static int ov4689_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct v4l2_subdev *sd;
+	struct ov4689 *ov4689;
+	int ret;
+
+	ret = ov4689_check_hwcfg(dev);
+	if (ret)
+		return ret;
+
+	ov4689 = devm_kzalloc(dev, sizeof(*ov4689), GFP_KERNEL);
+	if (!ov4689)
+		return -ENOMEM;
+
+	ov4689->client = client;
+	ov4689->cur_mode = &supported_modes[OV4689_MODE_2688_1520];
+
+	ov4689->xvclk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(ov4689->xvclk)) {
+		return dev_err_probe(dev, PTR_ERR(ov4689->xvclk),
+				     "Failed to get external clock\n");
+	}
+
+	if (!ov4689->xvclk) {
+		dev_dbg(dev,
+			"No clock provided, using clock-frequency property\n");
+		device_property_read_u32(dev, "clock-frequency", &ov4689->clock_rate);
+	} else {
+		ov4689->clock_rate = clk_get_rate(ov4689->xvclk);
+	}
+
+	if (ov4689->clock_rate != OV4689_XVCLK_FREQ) {
+		dev_err(dev,
+			"External clock rate mismatch: got %d Hz, expected %d Hz\n",
+			ov4689->clock_rate, OV4689_XVCLK_FREQ);
+		return -EINVAL;
+	}
+
+	ov4689->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+						     GPIOD_OUT_LOW);
+	if (IS_ERR(ov4689->reset_gpio)) {
+		dev_err(dev, "Failed to get reset-gpios\n");
+		return PTR_ERR(ov4689->reset_gpio);
+	}
+
+	ov4689->pwdn_gpio = devm_gpiod_get_optional(dev, "pwdn", GPIOD_OUT_LOW);
+	if (IS_ERR(ov4689->pwdn_gpio)) {
+		dev_err(dev, "Failed to get pwdn-gpios\n");
+		return PTR_ERR(ov4689->pwdn_gpio);
+	}
+
+	ret = ov4689_configure_regulators(ov4689);
+	if (ret) {
+		dev_err(dev, "Failed to get power regulators\n");

dev_err_probe()?
I think that devm_regulator_bulk_get() can return -EPROBE_DEFER)

+		return ret;
+	}
+
+	mutex_init(&ov4689->mutex);
+
+	sd = &ov4689->subdev;
+	v4l2_i2c_subdev_init(sd, client, &ov4689_subdev_ops);
+	ret = ov4689_initialize_controls(ov4689);
+	if (ret)
+		goto err_destroy_mutex;
+
+	ret = ov4689_power_on(dev);
+	if (ret)
+		goto err_free_handler;
+
+	ret = ov4689_check_sensor_id(ov4689, client);
+	if (ret)
+		goto err_power_off;
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+	sd->internal_ops = &ov4689_internal_ops;
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+#endif
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	ov4689->pad.flags = MEDIA_PAD_FL_SOURCE;
+	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ret = media_entity_pads_init(&sd->entity, 1, &ov4689->pad);
+	if (ret < 0)
+		goto err_power_off;
+#endif
+
+	ret = v4l2_async_register_subdev_sensor(sd);
+	if (ret) {
+		dev_err(dev, "v4l2 async register subdev failed\n");
+		goto err_clean_entity;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_idle(dev);
+
+	return 0;
+
+err_clean_entity:
+	media_entity_cleanup(&sd->entity);
+err_power_off:
+	ov4689_power_off(dev);
+err_free_handler:
+	v4l2_ctrl_handler_free(&ov4689->ctrl_handler);
+err_destroy_mutex:
+	mutex_destroy(&ov4689->mutex);
+
+	return ret;
+}

[...]




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