From b7e155e16601b0c6f34e3345b9eca6a2efc5bc5d Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sun, 15 Jan 2023 22:03:19 +0100 Subject: media: atomisp: ov2680: Switch over to ACPI powermanagement The DSDT of all Windows BYT / CHT devices which I have seen has proper ACPI powermagement for the clk and regulators used by the sensors. So there is no need for the whole custom atomisp_gmin custom code to disable the ACPI pm and directly poke at the PMIC for this. Replace all the atomisp_gmin usage with using the new atomisp_register_sensor_no_gmin() / atomisp_unregister_subdev() helpers which allow registering a sensor with the atomisp code without using any of the atomisp_gmin power-management code. Note eventually these calls should be replaced by the standard v4l2_async_register_subdev_sensor() mechanism. But this first requires a bunch of work to the atomisp main code to make it set the necessary fwnodes up, similar to how drivers/media/pci/intel/ipu3/cio2-bridge.c does this. This has been tested on: -Trekstor Surftab duo W1 10.1, CHT, AXP288 PMIC, 2x ov2680 sensor -Asus T101HA, CHT, TI PMIC, 1x ov2680 sensor -MPMAN Converter 9, BYT, AXP288 PMIC, ov2680 back, gc0310 front sensor Reviewed-by: Andy Shevchenko Signed-off-by: Hans de Goede Signed-off-by: Mauro Carvalho Chehab --- drivers/staging/media/atomisp/i2c/atomisp-ov2680.c | 231 +++++---------------- drivers/staging/media/atomisp/i2c/ov2680.h | 3 +- 2 files changed, 53 insertions(+), 181 deletions(-) (limited to 'drivers/staging') diff --git a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c index 06df78d46689..aeb38599fe13 100644 --- a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c +++ b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c @@ -17,6 +17,8 @@ #include #include +#include +#include #include #include #include @@ -185,145 +187,6 @@ static int ov2680_init_registers(struct v4l2_subdev *sd) return ret; } -static int power_ctrl(struct v4l2_subdev *sd, bool flag) -{ - int ret = 0; - struct ov2680_device *dev = to_ov2680_sensor(sd); - struct i2c_client *client = v4l2_get_subdevdata(sd); - - if (!dev || !dev->platform_data) - return -ENODEV; - - dev_dbg(&client->dev, "%s: %s", __func__, flag ? "on" : "off"); - - if (flag) { - ret |= dev->platform_data->v1p8_ctrl(sd, 1); - ret |= dev->platform_data->v2p8_ctrl(sd, 1); - usleep_range(10000, 15000); - } - - if (!flag || ret) { - ret |= dev->platform_data->v1p8_ctrl(sd, 0); - ret |= dev->platform_data->v2p8_ctrl(sd, 0); - } - return ret; -} - -static int gpio_ctrl(struct v4l2_subdev *sd, bool flag) -{ - int ret; - struct ov2680_device *dev = to_ov2680_sensor(sd); - - if (!dev || !dev->platform_data) - return -ENODEV; - - /* - * The OV2680 documents only one GPIO input (#XSHUTDN), but - * existing integrations often wire two (reset/power_down) - * because that is the way other sensors work. There is no - * way to tell how it is wired internally, so existing - * firmwares expose both and we drive them symmetrically. - */ - if (flag) { - ret = dev->platform_data->gpio0_ctrl(sd, 1); - usleep_range(10000, 15000); - /* Ignore return from second gpio, it may not be there */ - dev->platform_data->gpio1_ctrl(sd, 1); - usleep_range(10000, 15000); - } else { - dev->platform_data->gpio1_ctrl(sd, 0); - ret = dev->platform_data->gpio0_ctrl(sd, 0); - } - return ret; -} - -static int power_up(struct v4l2_subdev *sd) -{ - struct ov2680_device *dev = to_ov2680_sensor(sd); - struct i2c_client *client = v4l2_get_subdevdata(sd); - int ret; - - if (!dev->platform_data) { - dev_err(&client->dev, - "no camera_sensor_platform_data"); - return -ENODEV; - } - - /* power control */ - ret = power_ctrl(sd, 1); - if (ret) - goto fail_power; - - /* according to DS, at least 5ms is needed between DOVDD and PWDN */ - usleep_range(5000, 6000); - - /* gpio ctrl */ - ret = gpio_ctrl(sd, 1); - if (ret) { - ret = gpio_ctrl(sd, 1); - if (ret) - goto fail_power; - } - - /* flis clock control */ - ret = dev->platform_data->flisclk_ctrl(sd, 1); - if (ret) - goto fail_clk; - - /* according to DS, 20ms is needed between PWDN and i2c access */ - msleep(20); - - ret = ov2680_init_registers(sd); - if (ret) - goto fail_init_registers; - - return 0; - -fail_init_registers: - dev->platform_data->flisclk_ctrl(sd, 0); -fail_clk: - gpio_ctrl(sd, 0); -fail_power: - power_ctrl(sd, 0); - dev_err(&client->dev, "sensor power-up failed\n"); - - return ret; -} - -static int power_down(struct v4l2_subdev *sd) -{ - struct ov2680_device *dev = to_ov2680_sensor(sd); - struct i2c_client *client = v4l2_get_subdevdata(sd); - int ret = 0; - - if (!dev->platform_data) { - dev_err(&client->dev, - "no camera_sensor_platform_data"); - return -ENODEV; - } - - ret = dev->platform_data->flisclk_ctrl(sd, 0); - if (ret) - dev_err(&client->dev, "flisclk failed\n"); - - /* gpio ctrl */ - ret = gpio_ctrl(sd, 0); - if (ret) { - ret = gpio_ctrl(sd, 0); - if (ret) - dev_err(&client->dev, "gpio failed 2\n"); - } - - /* power control */ - ret = power_ctrl(sd, 0); - if (ret) { - dev_err(&client->dev, "vprog failed.\n"); - return ret; - } - - return 0; -} - static struct v4l2_mbus_framefmt * __ov2680_get_pad_format(struct ov2680_device *sensor, struct v4l2_subdev_state *state, @@ -588,20 +451,10 @@ error_unlock: return ret; } -static int ov2680_s_config(struct v4l2_subdev *sd, - int irq, void *platform_data) +static int ov2680_s_config(struct v4l2_subdev *sd) { - struct ov2680_device *sensor = to_ov2680_sensor(sd); struct i2c_client *client = v4l2_get_subdevdata(sd); - int ret = 0; - - if (!platform_data) - return -ENODEV; - - sensor->platform_data = - (struct camera_sensor_platform_data *)platform_data; - - mutex_lock(&sensor->input_lock); + int ret; ret = pm_runtime_get_sync(&client->dev); if (ret < 0) { @@ -609,29 +462,13 @@ static int ov2680_s_config(struct v4l2_subdev *sd, goto fail_power_on; } - ret = sensor->platform_data->csi_cfg(sd, 1); - if (ret) - goto fail_csi_cfg; - /* config & detect sensor */ ret = ov2680_detect(client); - if (ret) { + if (ret) dev_err(&client->dev, "ov2680_detect err s_config.\n"); - goto fail_csi_cfg; - } - /* turn off sensor, after probed */ - pm_runtime_put(&client->dev); - mutex_unlock(&sensor->input_lock); - - return 0; - -fail_csi_cfg: - sensor->platform_data->csi_cfg(sd, 0); fail_power_on: pm_runtime_put(&client->dev); - dev_err(&client->dev, "sensor power-gating failed\n"); - mutex_unlock(&sensor->input_lock); return ret; } @@ -770,20 +607,33 @@ static void ov2680_remove(struct i2c_client *client) dev_dbg(&client->dev, "ov2680_remove...\n"); - sensor->platform_data->csi_cfg(sd, 0); - + atomisp_unregister_subdev(sd); v4l2_device_unregister_subdev(sd); media_entity_cleanup(&sensor->sd.entity); v4l2_ctrl_handler_free(&sensor->ctrls.handler); pm_runtime_disable(&client->dev); } +/* + * Unlike other sensors which have both a rest and powerdown input pins, + * the OV2680 only has a powerdown input. But some ACPI tables still list + * 2 GPIOs for the OV2680 and it is unclear which to use. So try to get + * up to 2 GPIOs (1 mandatory, 1 optional) and control them in sync. + */ +static const struct acpi_gpio_params ov2680_first_gpio = { 0, 0, true }; +static const struct acpi_gpio_params ov2680_second_gpio = { 1, 0, true }; + +static const struct acpi_gpio_mapping ov2680_gpio_mapping[] = { + { "powerdown-gpios", &ov2680_first_gpio, 1 }, + { "powerdown-alt-gpios", &ov2680_second_gpio, 1 }, + { }, +}; + static int ov2680_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct ov2680_device *sensor; int ret; - void *pdata; sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); if (!sensor) @@ -794,18 +644,24 @@ static int ov2680_probe(struct i2c_client *client) sensor->client = client; v4l2_i2c_subdev_init(&sensor->sd, client, &ov2680_ops); - pdata = gmin_camera_platform_data(&sensor->sd, - ATOMISP_INPUT_FORMAT_RAW_10, - atomisp_bayer_order_bggr); - if (!pdata) - return -EINVAL; + ret = devm_acpi_dev_add_driver_gpios(&client->dev, ov2680_gpio_mapping); + if (ret) + return ret; + + sensor->powerdown = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_HIGH); + if (IS_ERR(sensor->powerdown)) + return dev_err_probe(dev, PTR_ERR(sensor->powerdown), "getting powerdown GPIO\n"); + + sensor->powerdown_alt = devm_gpiod_get_optional(dev, "powerdown-alt", GPIOD_OUT_HIGH); + if (IS_ERR(sensor->powerdown_alt)) + return dev_err_probe(dev, PTR_ERR(sensor->powerdown_alt), "getting powerdown-alt GPIO\n"); pm_runtime_set_suspended(dev); pm_runtime_enable(dev); pm_runtime_set_autosuspend_delay(dev, 1000); pm_runtime_use_autosuspend(dev); - ret = ov2680_s_config(&sensor->sd, client->irq, pdata); + ret = ov2680_s_config(&sensor->sd); if (ret) return ret; @@ -827,7 +683,8 @@ static int ov2680_probe(struct i2c_client *client) ov2680_fill_format(sensor, &sensor->mode.fmt, OV2680_NATIVE_WIDTH, OV2680_NATIVE_HEIGHT); - ret = atomisp_register_i2c_module(&sensor->sd, pdata, RAW_CAMERA); + ret = atomisp_register_sensor_no_gmin(&sensor->sd, 1, ATOMISP_INPUT_FORMAT_RAW_10, + atomisp_bayer_order_bggr); if (ret) { ov2680_remove(client); return ret; @@ -839,15 +696,29 @@ static int ov2680_probe(struct i2c_client *client) static int ov2680_suspend(struct device *dev) { struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ov2680_device *sensor = to_ov2680_sensor(sd); - return power_down(sd); + gpiod_set_value_cansleep(sensor->powerdown, 1); + gpiod_set_value_cansleep(sensor->powerdown_alt, 1); + return 0; } static int ov2680_resume(struct device *dev) { struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ov2680_device *sensor = to_ov2680_sensor(sd); - return power_up(sd); + /* according to DS, at least 5ms is needed after DOVDD (enabled by ACPI) */ + usleep_range(5000, 6000); + + gpiod_set_value_cansleep(sensor->powerdown, 0); + gpiod_set_value_cansleep(sensor->powerdown_alt, 0); + + /* according to DS, 20ms is needed between PWDN and i2c access */ + msleep(20); + + ov2680_init_registers(sd); + return 0; } static DEFINE_RUNTIME_DEV_PM_OPS(ov2680_pm_ops, ov2680_suspend, ov2680_resume, NULL); diff --git a/drivers/staging/media/atomisp/i2c/ov2680.h b/drivers/staging/media/atomisp/i2c/ov2680.h index 1403255f7c31..a37af0a74a53 100644 --- a/drivers/staging/media/atomisp/i2c/ov2680.h +++ b/drivers/staging/media/atomisp/i2c/ov2680.h @@ -113,7 +113,8 @@ struct ov2680_device { struct media_pad pad; struct mutex input_lock; struct i2c_client *client; - struct camera_sensor_platform_data *platform_data; + struct gpio_desc *powerdown; + struct gpio_desc *powerdown_alt; bool is_streaming; struct ov2680_mode { -- cgit v1.2.3-58-ga151