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Subject: media: ov2680: Add runtime-pm support
Author: Hans de Goede <hdego...@redhat.com>
Date: Thu Aug 3 11:33:26 2023 +0200
Remove the obsolete s_power() callback and instead use runtime-pm +
autosuspend, powering-on the sensor on s_stream(1) and releasing
the runtime-pm reference on s_stream(0).
This also removes the need for ov2680_mode_restore() instead
ov2680_stream_enable() now takes care of all sensor initalization
after power-on.
This is a preparation patch for adding ACPI support.
Note this also removes putting the clock lane into LP-11 state from
ov2680_power_on() since now streaming will start immediately after
powering on the sensor there is no need to put the clock lane
in a low power state.
Acked-by: Rui Miguel Silva <rmf...@gmail.com>
Reviewed-by: Daniel Scally <dan.sca...@ideasonboard.com>
Signed-off-by: Hans de Goede <hdego...@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>
drivers/media/i2c/ov2680.c | 134 +++++++++++++++++++++------------------------
1 file changed, 61 insertions(+), 73 deletions(-)
---
diff --git a/drivers/media/i2c/ov2680.c b/drivers/media/i2c/ov2680.c
index 9c5f4ac592d8..bc0ca2927370 100644
--- a/drivers/media/i2c/ov2680.c
+++ b/drivers/media/i2c/ov2680.c
@@ -18,6 +18,7 @@
#include <linux/init.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
@@ -99,7 +100,6 @@ struct ov2680_dev {
struct gpio_desc *reset_gpio;
struct mutex lock; /* protect members */
- bool mode_pending_changes;
bool is_enabled;
bool is_streaming;
@@ -282,19 +282,15 @@ static int ov2680_exposure_set(struct ov2680_dev *sensor,
u32 exp)
}
static int ov2680_stream_enable(struct ov2680_dev *sensor)
-{
- return cci_write(sensor->regmap, OV2680_REG_STREAM_CTRL, 1, NULL);
-}
-
-static int ov2680_stream_disable(struct ov2680_dev *sensor)
-{
- return cci_write(sensor->regmap, OV2680_REG_STREAM_CTRL, 0, NULL);
-}
-
-static int ov2680_mode_set(struct ov2680_dev *sensor)
{
int ret;
+ ret = regmap_multi_reg_write(sensor->regmap,
+ ov2680_mode_init_data.reg_data,
+ ov2680_mode_init_data.reg_data_size);
+ if (ret < 0)
+ return ret;
+
ret = regmap_multi_reg_write(sensor->regmap,
sensor->current_mode->reg_data,
sensor->current_mode->reg_data_size);
@@ -306,22 +302,12 @@ static int ov2680_mode_set(struct ov2680_dev *sensor)
if (ret < 0)
return ret;
- sensor->mode_pending_changes = false;
-
- return 0;
+ return cci_write(sensor->regmap, OV2680_REG_STREAM_CTRL, 1, NULL);
}
-static int ov2680_mode_restore(struct ov2680_dev *sensor)
+static int ov2680_stream_disable(struct ov2680_dev *sensor)
{
- int ret;
-
- ret = regmap_multi_reg_write(sensor->regmap,
- ov2680_mode_init_data.reg_data,
- ov2680_mode_init_data.reg_data_size);
- if (ret < 0)
- return ret;
-
- return ov2680_mode_set(sensor);
+ return cci_write(sensor->regmap, OV2680_REG_STREAM_CTRL, 0, NULL);
}
static int ov2680_power_off(struct ov2680_dev *sensor)
@@ -369,11 +355,6 @@ static int ov2680_power_on(struct ov2680_dev *sensor)
sensor->is_enabled = true;
- /* Set clock lane into LP-11 state */
- ov2680_stream_enable(sensor);
- usleep_range(1000, 2000);
- ov2680_stream_disable(sensor);
-
return 0;
err_disable_regulators:
@@ -381,26 +362,6 @@ err_disable_regulators:
return ret;
}
-static int ov2680_s_power(struct v4l2_subdev *sd, int on)
-{
- struct ov2680_dev *sensor = to_ov2680_dev(sd);
- int ret = 0;
-
- mutex_lock(&sensor->lock);
-
- if (on)
- ret = ov2680_power_on(sensor);
- else
- ret = ov2680_power_off(sensor);
-
- if (on && ret == 0)
- ret = ov2680_mode_restore(sensor);
-
- mutex_unlock(&sensor->lock);
-
- return ret;
-}
-
static int ov2680_s_g_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *fi)
{
@@ -423,16 +384,20 @@ static int ov2680_s_stream(struct v4l2_subdev *sd, int
enable)
if (sensor->is_streaming == !!enable)
goto unlock;
- if (enable && sensor->mode_pending_changes) {
- ret = ov2680_mode_set(sensor);
+ if (enable) {
+ ret = pm_runtime_resume_and_get(sensor->sd.dev);
if (ret < 0)
goto unlock;
- }
- if (enable)
ret = ov2680_stream_enable(sensor);
- else
+ if (ret < 0) {
+ pm_runtime_put(sensor->sd.dev);
+ goto unlock;
+ }
+ } else {
ret = ov2680_stream_disable(sensor);
+ pm_runtime_put(sensor->sd.dev);
+ }
sensor->is_streaming = !!enable;
@@ -519,7 +484,6 @@ static int ov2680_set_fmt(struct v4l2_subdev *sd,
sensor->current_mode = mode;
sensor->fmt = format->format;
- sensor->mode_pending_changes = true;
unlock:
mutex_unlock(&sensor->lock);
@@ -603,10 +567,6 @@ static const struct v4l2_ctrl_ops ov2680_ctrl_ops = {
.s_ctrl = ov2680_s_ctrl,
};
-static const struct v4l2_subdev_core_ops ov2680_core_ops = {
- .s_power = ov2680_s_power,
-};
-
static const struct v4l2_subdev_video_ops ov2680_video_ops = {
.g_frame_interval = ov2680_s_g_frame_interval,
.s_frame_interval = ov2680_s_g_frame_interval,
@@ -623,7 +583,6 @@ static const struct v4l2_subdev_pad_ops ov2680_pad_ops = {
};
static const struct v4l2_subdev_ops ov2680_subdev_ops = {
- .core = &ov2680_core_ops,
.video = &ov2680_video_ops,
.pad = &ov2680_pad_ops,
};
@@ -643,8 +602,6 @@ static int ov2680_mode_init(struct ov2680_dev *sensor)
sensor->current_mode = init_mode;
- sensor->mode_pending_changes = true;
-
return 0;
}
@@ -722,8 +679,6 @@ static int ov2680_check_id(struct ov2680_dev *sensor)
u64 chip_id;
int ret;
- ov2680_power_on(sensor);
-
ret = cci_read(sensor->regmap, OV2680_REG_CHIP_ID, &chip_id, NULL);
if (ret < 0) {
dev_err(sensor->dev, "failed to read chip id\n");
@@ -800,18 +755,39 @@ static int ov2680_probe(struct i2c_client *client)
mutex_init(&sensor->lock);
- ret = ov2680_check_id(sensor);
+ /*
+ * Power up and verify the chip now, so that if runtime pm is
+ * disabled the chip is left on and streaming will work.
+ */
+ ret = ov2680_power_on(sensor);
if (ret < 0)
goto lock_destroy;
+ ret = ov2680_check_id(sensor);
+ if (ret < 0)
+ goto err_powerdown;
+
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_get_noresume(&client->dev);
+ pm_runtime_enable(&client->dev);
+
ret = ov2680_v4l2_register(sensor);
if (ret < 0)
- goto lock_destroy;
+ goto err_pm_runtime;
+
+ pm_runtime_set_autosuspend_delay(&client->dev, 1000);
+ pm_runtime_use_autosuspend(&client->dev);
+ pm_runtime_put_autosuspend(&client->dev);
dev_info(dev, "ov2680 init correctly\n");
return 0;
+err_pm_runtime:
+ pm_runtime_disable(&client->dev);
+ pm_runtime_put_noidle(&client->dev);
+err_powerdown:
+ ov2680_power_off(sensor);
lock_destroy:
dev_err(dev, "ov2680 init fail: %d\n", ret);
mutex_destroy(&sensor->lock);
@@ -828,9 +804,18 @@ static void ov2680_remove(struct i2c_client *client)
mutex_destroy(&sensor->lock);
media_entity_cleanup(&sensor->sd.entity);
v4l2_ctrl_handler_free(&sensor->ctrls.handler);
+
+ /*
+ * Disable runtime PM. In case runtime PM is disabled in the kernel,
+ * make sure to turn power off manually.
+ */
+ pm_runtime_disable(&client->dev);
+ if (!pm_runtime_status_suspended(&client->dev))
+ ov2680_power_off(sensor);
+ pm_runtime_set_suspended(&client->dev);
}
-static int __maybe_unused ov2680_suspend(struct device *dev)
+static int ov2680_suspend(struct device *dev)
{
struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct ov2680_dev *sensor = to_ov2680_dev(sd);
@@ -838,15 +823,19 @@ static int __maybe_unused ov2680_suspend(struct device
*dev)
if (sensor->is_streaming)
ov2680_stream_disable(sensor);
- return 0;
+ return ov2680_power_off(sensor);
}
-static int __maybe_unused ov2680_resume(struct device *dev)
+static int ov2680_resume(struct device *dev)
{
struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct ov2680_dev *sensor = to_ov2680_dev(sd);
int ret;
+ ret = ov2680_power_on(sensor);
+ if (ret < 0)
+ goto stream_disable;
+
if (sensor->is_streaming) {
ret = ov2680_stream_enable(sensor);
if (ret < 0)
@@ -862,9 +851,8 @@ stream_disable:
return ret;
}
-static const struct dev_pm_ops ov2680_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(ov2680_suspend, ov2680_resume)
-};
+static DEFINE_RUNTIME_DEV_PM_OPS(ov2680_pm_ops, ov2680_suspend, ov2680_resume,
+ NULL);
static const struct of_device_id ov2680_dt_ids[] = {
{ .compatible = "ovti,ov2680" },
@@ -875,7 +863,7 @@ MODULE_DEVICE_TABLE(of, ov2680_dt_ids);
static struct i2c_driver ov2680_i2c_driver = {
.driver = {
.name = "ov2680",
- .pm = &ov2680_pm_ops,
+ .pm = pm_sleep_ptr(&ov2680_pm_ops),
.of_match_table = ov2680_dt_ids,
},
.probe = ov2680_probe,
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