Re: [PATCH 2/3] media: i2c: gc0310: use cached client and device pointers

From: Hans de Goede

Date: Wed Apr 01 2026 - 15:11:16 EST

Hi,

On 1-Apr-26 20:16, Sanjay Chitroda wrote:
> From: Sanjay Chitroda <sanjayembeddedse@xxxxxxxxx>
>
> The driver was repeatedly retrieving the i2c_client using
> v4l2_get_subdevdata() only to access the underlying struct device.
>
> Replace this with the cached sensor->client and sensor->dev pointers,
> which are already available in the sensor structure.
>
> This simplifies the code, avoids redundant subdev lookups, and makes
> the driver more consistent with common V4L2 sensor driver patterns.
> No functional change intended.

So now you've grown struct gc0310_device by 16 bytes and
gained nothing much. And again this sound very much AI
generated. Which is not necessarily a bad thing if the changes
are actually useful, but this seems like it is just code-churn
without any benefits.

Regards,

Hans

>
> Signed-off-by: Sanjay Chitroda <sanjayembeddedse@xxxxxxxxx>
> ---
> drivers/media/i2c/gc0310.c | 72 ++++++++++++++++++++------------------
> 1 file changed, 37 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/media/i2c/gc0310.c b/drivers/media/i2c/gc0310.c
> index 72a82ad4118a..e538479fee2e 100644
> --- a/drivers/media/i2c/gc0310.c
> +++ b/drivers/media/i2c/gc0310.c
> @@ -84,6 +84,9 @@
> #define to_gc0310_sensor(x) container_of(x, struct gc0310_device, sd)
>
> struct gc0310_device {
> + struct device *dev;
> + struct i2c_client *client;
> +
> struct v4l2_subdev sd;
> struct media_pad pad;
>
> @@ -409,28 +412,27 @@ static int gc0310_power_on(struct device *dev)
>
> static int gc0310_detect(struct gc0310_device *sensor)
> {
> - struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
> u64 val;
> int ret;
>
> - if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
> + if (!i2c_check_functionality(sensor->client->adapter, I2C_FUNC_I2C))
> return -ENODEV;
>
> ret = cci_read(sensor->regmap, GC0310_SC_CMMN_CHIP_ID_REG, &val, NULL);
> if (ret < 0) {
> - dev_err(&client->dev, "read sensor_id failed: %d\n", ret);
> + dev_err(sensor->dev, "read sensor_id failed: %d\n", ret);
> return -ENODEV;
> }
>
> - dev_dbg(&client->dev, "sensor ID = 0x%llx\n", val);
> + dev_dbg(sensor->dev, "sensor ID = 0x%llx\n", val);
>
> if (val != GC0310_ID) {
> - dev_err(&client->dev, "sensor ID error, read id = 0x%llx, target id = 0x%x\n",
> + dev_err(sensor->dev, "sensor ID error, read id = 0x%llx, target id = 0x%x\n",
> val, GC0310_ID);
> return -ENODEV;
> }
>
> - dev_dbg(&client->dev, "detect gc0310 success\n");
> + dev_dbg(sensor->dev, "detect gc0310 success\n");
>
> return 0;
> }
> @@ -440,10 +442,9 @@ static int gc0310_enable_streams(struct v4l2_subdev *sd,
> u32 pad, u64 streams_mask)
> {
> struct gc0310_device *sensor = to_gc0310_sensor(sd);
> - struct i2c_client *client = v4l2_get_subdevdata(sd);
> int ret;
>
> - ret = pm_runtime_resume_and_get(&client->dev);
> + ret = pm_runtime_resume_and_get(sensor->dev);
> if (ret)
> return ret;
>
> @@ -474,7 +475,7 @@ static int gc0310_enable_streams(struct v4l2_subdev *sd,
>
> error_power_down:
> if (ret)
> - pm_runtime_put(&client->dev);
> + pm_runtime_put(sensor->dev);
>
> return ret;
> }
> @@ -484,7 +485,6 @@ static int gc0310_disable_streams(struct v4l2_subdev *sd,
> u32 pad, u64 streams_mask)
> {
> struct gc0310_device *sensor = to_gc0310_sensor(sd);
> - struct i2c_client *client = v4l2_get_subdevdata(sd);
> int ret = 0;
>
> cci_write(sensor->regmap, GC0310_RESET_RELATED_REG,
> @@ -494,7 +494,7 @@ static int gc0310_disable_streams(struct v4l2_subdev *sd,
> cci_write(sensor->regmap, GC0310_RESET_RELATED_REG,
> GC0310_REGISTER_PAGE_0, &ret);
>
> - pm_runtime_put(&client->dev);
> + pm_runtime_put(sensor->dev);
> return ret;
> }
>
> @@ -559,7 +559,6 @@ static const struct v4l2_subdev_internal_ops gc0310_internal_ops = {
>
> static int gc0310_init_controls(struct gc0310_device *sensor)
> {
> - struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
> struct v4l2_ctrl_handler *hdl = &sensor->ctrls.handler;
> struct v4l2_fwnode_device_properties props;
> int exp_max, ret;
> @@ -597,7 +596,7 @@ static int gc0310_init_controls(struct gc0310_device *sensor)
> GC0310_H_BLANK_DEFAULT, 1,
> GC0310_H_BLANK_DEFAULT);
>
> - ret = v4l2_fwnode_device_parse(&client->dev, &props);
> + ret = v4l2_fwnode_device_parse(sensor->dev, &props);
> if (ret)
> return ret;
>
> @@ -621,10 +620,10 @@ static void gc0310_remove(struct i2c_client *client)
> v4l2_subdev_cleanup(sd);
> media_entity_cleanup(&sensor->sd.entity);
> v4l2_ctrl_handler_free(&sensor->ctrls.handler);
> - pm_runtime_disable(&client->dev);
> - if (!pm_runtime_status_suspended(&client->dev)) {
> - gc0310_power_off(&client->dev);
> - pm_runtime_set_suspended(&client->dev);
> + pm_runtime_disable(sensor->dev);
> + if (!pm_runtime_status_suspended(sensor->dev)) {
> + gc0310_power_off(sensor->dev);
> + pm_runtime_set_suspended(sensor->dev);
> }
> }
>
> @@ -695,15 +694,18 @@ static int gc0310_probe(struct i2c_client *client)
> if (!sensor)
> return -ENOMEM;
>
> - sensor->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
> + sensor->client = client;
> + sensor->dev = &client->dev;
> +
> + sensor->reset = devm_gpiod_get(sensor->dev, "reset", GPIOD_OUT_HIGH);
> if (IS_ERR(sensor->reset)) {
> - return dev_err_probe(&client->dev, PTR_ERR(sensor->reset),
> + return dev_err_probe(sensor->dev, PTR_ERR(sensor->reset),
> "getting reset GPIO\n");
> }
>
> - sensor->powerdown = devm_gpiod_get(&client->dev, "powerdown", GPIOD_OUT_HIGH);
> + sensor->powerdown = devm_gpiod_get(sensor->dev, "powerdown", GPIOD_OUT_HIGH);
> if (IS_ERR(sensor->powerdown)) {
> - return dev_err_probe(&client->dev, PTR_ERR(sensor->powerdown),
> + return dev_err_probe(sensor->dev, PTR_ERR(sensor->powerdown),
> "getting powerdown GPIO\n");
> }
>
> @@ -713,11 +715,11 @@ static int gc0310_probe(struct i2c_client *client)
> if (IS_ERR(sensor->regmap))
> return PTR_ERR(sensor->regmap);
>
> - gc0310_power_on(&client->dev);
> + gc0310_power_on(sensor->dev);
>
> - pm_runtime_set_active(&client->dev);
> - pm_runtime_get_noresume(&client->dev);
> - pm_runtime_enable(&client->dev);
> + pm_runtime_set_active(sensor->dev);
> + pm_runtime_get_noresume(sensor->dev);
> + pm_runtime_enable(sensor->dev);
>
> ret = gc0310_detect(sensor);
> if (ret)
> @@ -734,34 +736,34 @@ static int gc0310_probe(struct i2c_client *client)
>
> ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad);
> if (ret) {
> - dev_err_probe(&client->dev, ret, "failed to init entity pads\n");
> + dev_err_probe(sensor->dev, ret, "failed to init entity pads\n");
> goto error_handler_free;
> }
>
> sensor->sd.state_lock = sensor->ctrls.handler.lock;
> ret = v4l2_subdev_init_finalize(&sensor->sd);
> if (ret) {
> - dev_err_probe(&client->dev, ret, "subdev init error\n");
> + dev_err_probe(sensor->dev, ret, "subdev init error\n");
> goto error_media_entity;
> }
>
> ret = v4l2_async_register_subdev_sensor(&sensor->sd);
> if (ret) {
> - dev_err_probe(&client->dev, ret,
> + dev_err_probe(sensor->dev, ret,
> "failed to register gc0310 sub-device\n");
> goto error_subdev_cleanup;
> }
>
> - pm_runtime_set_autosuspend_delay(&client->dev, 1000);
> - pm_runtime_use_autosuspend(&client->dev);
> - pm_runtime_put_autosuspend(&client->dev);
> + pm_runtime_set_autosuspend_delay(sensor->dev, 1000);
> + pm_runtime_use_autosuspend(sensor->dev);
> + pm_runtime_put_autosuspend(sensor->dev);
>
> return 0;
>
> error_subdev_cleanup:
> v4l2_subdev_cleanup(&sensor->sd);
> - pm_runtime_disable(&client->dev);
> - pm_runtime_set_suspended(&client->dev);
> + pm_runtime_disable(sensor->dev);
> + pm_runtime_set_suspended(sensor->dev);
>
> error_media_entity:
> media_entity_cleanup(&sensor->sd.entity);
> @@ -770,8 +772,8 @@ static int gc0310_probe(struct i2c_client *client)
> v4l2_ctrl_handler_free(&sensor->ctrls.handler);
>
> error_power_off:
> - pm_runtime_put_noidle(&client->dev);
> - gc0310_power_off(&client->dev);
> + pm_runtime_put_noidle(sensor->dev);
> + gc0310_power_off(sensor->dev);
>
> return ret;
> }