From: Lad Prabhakar <[email protected]>
Switch to using runtime PM for power management.
Signed-off-by: Lad Prabhakar <[email protected]>
---
v1->v2
* Moved pm_runtime_*_autosuspend() calls after registering the subdev.
---
drivers/media/i2c/Kconfig | 2 +-
drivers/media/i2c/ov5645.c | 137 +++++++++++++++++++------------------
2 files changed, 70 insertions(+), 69 deletions(-)
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 7806d4b81716..c0edd1017fe8 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -459,7 +459,7 @@ config VIDEO_OV5640
config VIDEO_OV5645
tristate "OmniVision OV5645 sensor support"
depends on OF
- depends on I2C && VIDEO_DEV
+ depends on I2C && PM && VIDEO_DEV
select MEDIA_CONTROLLER
select VIDEO_V4L2_SUBDEV_API
select V4L2_FWNODE
diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 81e4e87e1821..1551690a94e0 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -27,6 +27,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
@@ -108,7 +109,6 @@ struct ov5645 {
u8 timing_tc_reg21;
struct mutex power_lock; /* lock to protect power state */
- int power_count;
struct gpio_desc *enable_gpio;
struct gpio_desc *rst_gpio;
@@ -635,8 +635,24 @@ static int ov5645_set_register_array(struct ov5645 *ov5645,
return 0;
}
-static int ov5645_set_power_on(struct ov5645 *ov5645)
+static int ov5645_set_power_off(struct device *dev)
{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct ov5645 *ov5645 = to_ov5645(sd);
+
+ ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
+ gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
+ gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
+ clk_disable_unprepare(ov5645->xclk);
+ regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
+
+ return 0;
+}
+
+static int ov5645_set_power_on(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct ov5645 *ov5645 = to_ov5645(sd);
int ret;
ret = regulator_bulk_enable(OV5645_NUM_SUPPLIES, ov5645->supplies);
@@ -658,57 +674,19 @@ static int ov5645_set_power_on(struct ov5645 *ov5645)
msleep(20);
- return 0;
-}
-
-static void ov5645_set_power_off(struct ov5645 *ov5645)
-{
- gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
- gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
- clk_disable_unprepare(ov5645->xclk);
- regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
-}
-
-static int ov5645_s_power(struct v4l2_subdev *sd, int on)
-{
- struct ov5645 *ov5645 = to_ov5645(sd);
- int ret = 0;
-
- mutex_lock(&ov5645->power_lock);
-
- /* If the power count is modified from 0 to != 0 or from != 0 to 0,
- * update the power state.
- */
- if (ov5645->power_count == !on) {
- if (on) {
- ret = ov5645_set_power_on(ov5645);
- if (ret < 0)
- goto exit;
-
- ret = ov5645_set_register_array(ov5645,
- ov5645_global_init_setting,
+ ret = ov5645_set_register_array(ov5645, ov5645_global_init_setting,
ARRAY_SIZE(ov5645_global_init_setting));
- if (ret < 0) {
- dev_err(ov5645->dev,
- "could not set init registers\n");
- ov5645_set_power_off(ov5645);
- goto exit;
- }
-
- usleep_range(500, 1000);
- } else {
- ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
- ov5645_set_power_off(ov5645);
- }
+ if (ret < 0) {
+ dev_err(ov5645->dev, "could not set init registers\n");
+ goto exit;
}
- /* Update the power count. */
- ov5645->power_count += on ? 1 : -1;
- WARN_ON(ov5645->power_count < 0);
+ usleep_range(500, 1000);
-exit:
- mutex_unlock(&ov5645->power_lock);
+ return 0;
+exit:
+ ov5645_set_power_off(dev);
return ret;
}
@@ -795,7 +773,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
int ret;
mutex_lock(&ov5645->power_lock);
- if (!ov5645->power_count) {
+ if (!pm_runtime_get_if_in_use(ov5645->dev)) {
mutex_unlock(&ov5645->power_lock);
return 0;
}
@@ -827,6 +805,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
break;
}
+ pm_runtime_put_autosuspend(ov5645->dev);
mutex_unlock(&ov5645->power_lock);
return ret;
@@ -991,6 +970,10 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
int ret;
if (enable) {
+ ret = pm_runtime_resume_and_get(ov5645->dev);
+ if (ret < 0)
+ return ret;
+
ret = ov5645_set_register_array(ov5645,
ov5645->current_mode->data,
ov5645->current_mode->data_size);
@@ -998,22 +981,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
dev_err(ov5645->dev, "could not set mode %dx%d\n",
ov5645->current_mode->width,
ov5645->current_mode->height);
- return ret;
+ goto err_rpm_put;
}
ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
if (ret < 0) {
dev_err(ov5645->dev, "could not sync v4l2 controls\n");
- return ret;
+ goto err_rpm_put;
}
ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
if (ret < 0)
- return ret;
+ goto err_rpm_put;
ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
OV5645_SYSTEM_CTRL0_START);
if (ret < 0)
- return ret;
+ goto err_rpm_put;
} else {
ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
if (ret < 0)
@@ -1023,14 +1006,15 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
OV5645_SYSTEM_CTRL0_STOP);
if (ret < 0)
return ret;
+ pm_runtime_put(ov5645->dev);
}
return 0;
-}
-static const struct v4l2_subdev_core_ops ov5645_core_ops = {
- .s_power = ov5645_s_power,
-};
+err_rpm_put:
+ pm_runtime_put(ov5645->dev);
+ return ret;
+}
static const struct v4l2_subdev_video_ops ov5645_video_ops = {
.s_stream = ov5645_s_stream,
@@ -1046,7 +1030,6 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
};
static const struct v4l2_subdev_ops ov5645_subdev_ops = {
- .core = &ov5645_core_ops,
.video = &ov5645_video_ops,
.pad = &ov5645_subdev_pad_ops,
};
@@ -1188,11 +1171,9 @@ static int ov5645_probe(struct i2c_client *client)
goto free_ctrl;
}
- ret = ov5645_s_power(&ov5645->sd, true);
- if (ret < 0) {
- dev_err(dev, "could not power up OV5645\n");
+ ret = ov5645_set_power_on(dev);
+ if (ret)
goto free_entity;
- }
ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
@@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
+ pm_runtime_set_active(dev);
+ pm_runtime_get_noresume(dev);
+ pm_runtime_enable(dev);
+
ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
&ov5645->aec_pk_manual);
if (ret < 0) {
dev_err(dev, "could not read AEC/AGC mode\n");
ret = -ENODEV;
- goto power_down;
+ goto err_pm_runtime;
}
ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
@@ -1222,7 +1207,7 @@ static int ov5645_probe(struct i2c_client *client)
if (ret < 0) {
dev_err(dev, "could not read vflip value\n");
ret = -ENODEV;
- goto power_down;
+ goto err_pm_runtime;
}
ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
@@ -1230,23 +1215,30 @@ static int ov5645_probe(struct i2c_client *client)
if (ret < 0) {
dev_err(dev, "could not read hflip value\n");
ret = -ENODEV;
- goto power_down;
+ goto err_pm_runtime;
}
- ov5645_s_power(&ov5645->sd, false);
-
ret = v4l2_async_register_subdev(&ov5645->sd);
if (ret < 0) {
dev_err(dev, "could not register v4l2 device\n");
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
goto free_entity;
}
+ pm_runtime_set_autosuspend_delay(dev, 1000);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_put_autosuspend(dev);
+
ov5645_entity_init_cfg(&ov5645->sd, NULL);
return 0;
+err_pm_runtime:
+ pm_runtime_disable(dev);
+ pm_runtime_put_noidle(dev);
power_down:
- ov5645_s_power(&ov5645->sd, false);
+ ov5645_set_power_off(dev);
free_entity:
media_entity_cleanup(&ov5645->sd.entity);
free_ctrl:
@@ -1264,6 +1256,10 @@ static void ov5645_remove(struct i2c_client *client)
v4l2_async_unregister_subdev(&ov5645->sd);
media_entity_cleanup(&ov5645->sd.entity);
v4l2_ctrl_handler_free(&ov5645->ctrls);
+ pm_runtime_disable(ov5645->dev);
+ if (!pm_runtime_status_suspended(ov5645->dev))
+ ov5645_set_power_off(ov5645->dev);
+ pm_runtime_set_suspended(ov5645->dev);
mutex_destroy(&ov5645->power_lock);
}
@@ -1279,10 +1275,15 @@ static const struct of_device_id ov5645_of_match[] = {
};
MODULE_DEVICE_TABLE(of, ov5645_of_match);
+static const struct dev_pm_ops ov5645_pm_ops = {
+ SET_RUNTIME_PM_OPS(ov5645_set_power_off, ov5645_set_power_on, NULL)
+};
+
static struct i2c_driver ov5645_i2c_driver = {
.driver = {
.of_match_table = ov5645_of_match,
.name = "ov5645",
+ .pm = &ov5645_pm_ops,
},
.probe_new = ov5645_probe,
.remove = ov5645_remove,
--
2.25.1
Hi Prabhakar,
On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <[email protected]>
>
> Switch to using runtime PM for power management.
>
> Signed-off-by: Lad Prabhakar <[email protected]>
> ---
> v1->v2
> * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> ---
> drivers/media/i2c/Kconfig | 2 +-
> drivers/media/i2c/ov5645.c | 137 +++++++++++++++++++------------------
> 2 files changed, 70 insertions(+), 69 deletions(-)
>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 7806d4b81716..c0edd1017fe8 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -459,7 +459,7 @@ config VIDEO_OV5640
> config VIDEO_OV5645
> tristate "OmniVision OV5645 sensor support"
> depends on OF
> - depends on I2C && VIDEO_DEV
> + depends on I2C && PM && VIDEO_DEV
> select MEDIA_CONTROLLER
> select VIDEO_V4L2_SUBDEV_API
> select V4L2_FWNODE
> diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> index 81e4e87e1821..1551690a94e0 100644
> --- a/drivers/media/i2c/ov5645.c
> +++ b/drivers/media/i2c/ov5645.c
> @@ -27,6 +27,7 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/of_graph.h>
> +#include <linux/pm_runtime.h>
> #include <linux/regulator/consumer.h>
> #include <linux/slab.h>
> #include <linux/types.h>
> @@ -108,7 +109,6 @@ struct ov5645 {
> u8 timing_tc_reg21;
>
> struct mutex power_lock; /* lock to protect power state */
> - int power_count;
>
> struct gpio_desc *enable_gpio;
> struct gpio_desc *rst_gpio;
> @@ -635,8 +635,24 @@ static int ov5645_set_register_array(struct ov5645 *ov5645,
> return 0;
> }
>
> -static int ov5645_set_power_on(struct ov5645 *ov5645)
> +static int ov5645_set_power_off(struct device *dev)
> {
> + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> + struct ov5645 *ov5645 = to_ov5645(sd);
> +
> + ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
> + gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
> + gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
> + clk_disable_unprepare(ov5645->xclk);
> + regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> +
> + return 0;
> +}
> +
> +static int ov5645_set_power_on(struct device *dev)
> +{
> + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> + struct ov5645 *ov5645 = to_ov5645(sd);
> int ret;
>
> ret = regulator_bulk_enable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> @@ -658,57 +674,19 @@ static int ov5645_set_power_on(struct ov5645 *ov5645)
>
> msleep(20);
>
> - return 0;
> -}
> -
> -static void ov5645_set_power_off(struct ov5645 *ov5645)
> -{
> - gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
> - gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
> - clk_disable_unprepare(ov5645->xclk);
> - regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> -}
> -
> -static int ov5645_s_power(struct v4l2_subdev *sd, int on)
> -{
> - struct ov5645 *ov5645 = to_ov5645(sd);
> - int ret = 0;
> -
> - mutex_lock(&ov5645->power_lock);
> -
> - /* If the power count is modified from 0 to != 0 or from != 0 to 0,
> - * update the power state.
> - */
> - if (ov5645->power_count == !on) {
> - if (on) {
> - ret = ov5645_set_power_on(ov5645);
> - if (ret < 0)
> - goto exit;
> -
> - ret = ov5645_set_register_array(ov5645,
> - ov5645_global_init_setting,
> + ret = ov5645_set_register_array(ov5645, ov5645_global_init_setting,
> ARRAY_SIZE(ov5645_global_init_setting));
> - if (ret < 0) {
> - dev_err(ov5645->dev,
> - "could not set init registers\n");
> - ov5645_set_power_off(ov5645);
> - goto exit;
> - }
> -
> - usleep_range(500, 1000);
> - } else {
> - ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
> - ov5645_set_power_off(ov5645);
> - }
> + if (ret < 0) {
> + dev_err(ov5645->dev, "could not set init registers\n");
> + goto exit;
> }
>
> - /* Update the power count. */
> - ov5645->power_count += on ? 1 : -1;
> - WARN_ON(ov5645->power_count < 0);
> + usleep_range(500, 1000);
>
> -exit:
> - mutex_unlock(&ov5645->power_lock);
> + return 0;
>
> +exit:
> + ov5645_set_power_off(dev);
> return ret;
> }
>
> @@ -795,7 +773,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> int ret;
>
> mutex_lock(&ov5645->power_lock);
> - if (!ov5645->power_count) {
> + if (!pm_runtime_get_if_in_use(ov5645->dev)) {
> mutex_unlock(&ov5645->power_lock);
> return 0;
> }
> @@ -827,6 +805,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> break;
> }
>
> + pm_runtime_put_autosuspend(ov5645->dev);
I think you'll need pm_runtime_mark_last_busy() before this. I missed this
on the last round. Maybe in probe() too. Feel free to resend just this
patch.
> mutex_unlock(&ov5645->power_lock);
>
> return ret;
> @@ -991,6 +970,10 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> int ret;
>
> if (enable) {
> + ret = pm_runtime_resume_and_get(ov5645->dev);
> + if (ret < 0)
> + return ret;
> +
> ret = ov5645_set_register_array(ov5645,
> ov5645->current_mode->data,
> ov5645->current_mode->data_size);
> @@ -998,22 +981,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> dev_err(ov5645->dev, "could not set mode %dx%d\n",
> ov5645->current_mode->width,
> ov5645->current_mode->height);
> - return ret;
> + goto err_rpm_put;
> }
> ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
> if (ret < 0) {
> dev_err(ov5645->dev, "could not sync v4l2 controls\n");
> - return ret;
> + goto err_rpm_put;
> }
>
> ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
> if (ret < 0)
> - return ret;
> + goto err_rpm_put;
>
> ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> OV5645_SYSTEM_CTRL0_START);
> if (ret < 0)
> - return ret;
> + goto err_rpm_put;
> } else {
> ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> if (ret < 0)
> @@ -1023,14 +1006,15 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> OV5645_SYSTEM_CTRL0_STOP);
> if (ret < 0)
> return ret;
> + pm_runtime_put(ov5645->dev);
> }
>
> return 0;
> -}
>
> -static const struct v4l2_subdev_core_ops ov5645_core_ops = {
> - .s_power = ov5645_s_power,
> -};
> +err_rpm_put:
> + pm_runtime_put(ov5645->dev);
> + return ret;
> +}
>
> static const struct v4l2_subdev_video_ops ov5645_video_ops = {
> .s_stream = ov5645_s_stream,
> @@ -1046,7 +1030,6 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
> };
>
> static const struct v4l2_subdev_ops ov5645_subdev_ops = {
> - .core = &ov5645_core_ops,
> .video = &ov5645_video_ops,
> .pad = &ov5645_subdev_pad_ops,
> };
> @@ -1188,11 +1171,9 @@ static int ov5645_probe(struct i2c_client *client)
> goto free_ctrl;
> }
>
> - ret = ov5645_s_power(&ov5645->sd, true);
> - if (ret < 0) {
> - dev_err(dev, "could not power up OV5645\n");
> + ret = ov5645_set_power_on(dev);
> + if (ret)
> goto free_entity;
> - }
>
> ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
> if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
> @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
>
> dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
>
> + pm_runtime_set_active(dev);
> + pm_runtime_get_noresume(dev);
> + pm_runtime_enable(dev);
> +
> ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
> &ov5645->aec_pk_manual);
> if (ret < 0) {
> dev_err(dev, "could not read AEC/AGC mode\n");
> ret = -ENODEV;
> - goto power_down;
> + goto err_pm_runtime;
> }
>
> ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
> @@ -1222,7 +1207,7 @@ static int ov5645_probe(struct i2c_client *client)
> if (ret < 0) {
> dev_err(dev, "could not read vflip value\n");
> ret = -ENODEV;
> - goto power_down;
> + goto err_pm_runtime;
> }
>
> ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
> @@ -1230,23 +1215,30 @@ static int ov5645_probe(struct i2c_client *client)
> if (ret < 0) {
> dev_err(dev, "could not read hflip value\n");
> ret = -ENODEV;
> - goto power_down;
> + goto err_pm_runtime;
> }
>
> - ov5645_s_power(&ov5645->sd, false);
> -
> ret = v4l2_async_register_subdev(&ov5645->sd);
> if (ret < 0) {
> dev_err(dev, "could not register v4l2 device\n");
> + pm_runtime_disable(dev);
> + pm_runtime_set_suspended(dev);
> goto free_entity;
> }
>
> + pm_runtime_set_autosuspend_delay(dev, 1000);
> + pm_runtime_use_autosuspend(dev);
> + pm_runtime_put_autosuspend(dev);
> +
> ov5645_entity_init_cfg(&ov5645->sd, NULL);
>
> return 0;
>
> +err_pm_runtime:
> + pm_runtime_disable(dev);
> + pm_runtime_put_noidle(dev);
> power_down:
> - ov5645_s_power(&ov5645->sd, false);
> + ov5645_set_power_off(dev);
> free_entity:
> media_entity_cleanup(&ov5645->sd.entity);
> free_ctrl:
> @@ -1264,6 +1256,10 @@ static void ov5645_remove(struct i2c_client *client)
> v4l2_async_unregister_subdev(&ov5645->sd);
> media_entity_cleanup(&ov5645->sd.entity);
> v4l2_ctrl_handler_free(&ov5645->ctrls);
> + pm_runtime_disable(ov5645->dev);
> + if (!pm_runtime_status_suspended(ov5645->dev))
> + ov5645_set_power_off(ov5645->dev);
> + pm_runtime_set_suspended(ov5645->dev);
> mutex_destroy(&ov5645->power_lock);
> }
>
> @@ -1279,10 +1275,15 @@ static const struct of_device_id ov5645_of_match[] = {
> };
> MODULE_DEVICE_TABLE(of, ov5645_of_match);
>
> +static const struct dev_pm_ops ov5645_pm_ops = {
> + SET_RUNTIME_PM_OPS(ov5645_set_power_off, ov5645_set_power_on, NULL)
> +};
> +
> static struct i2c_driver ov5645_i2c_driver = {
> .driver = {
> .of_match_table = ov5645_of_match,
> .name = "ov5645",
> + .pm = &ov5645_pm_ops,
> },
> .probe_new = ov5645_probe,
> .remove = ov5645_remove,
--
Kind regards,
Sakari Ailus
Hi Sakari,
Thank you for the review.
On Fri, Oct 14, 2022 at 8:18 PM Sakari Ailus
<[email protected]> wrote:
>
> Hi Prabhakar,
>
> On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <[email protected]>
> >
> > Switch to using runtime PM for power management.
> >
> > Signed-off-by: Lad Prabhakar <[email protected]>
> > ---
> > v1->v2
> > * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> > ---
<snip>
> > @@ -795,7 +773,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> > int ret;
> >
> > mutex_lock(&ov5645->power_lock);
> > - if (!ov5645->power_count) {
> > + if (!pm_runtime_get_if_in_use(ov5645->dev)) {
> > mutex_unlock(&ov5645->power_lock);
> > return 0;
> > }
> > @@ -827,6 +805,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> > break;
> > }
> >
> > + pm_runtime_put_autosuspend(ov5645->dev);
>
> I think you'll need pm_runtime_mark_last_busy() before this. I missed this
> on the last round. Maybe in probe() too. Feel free to resend just this
> patch.
>
Agreed, I'll respin this patch fixing the above.
Cheers,
Prabhakar
Hello,
On Fri, Oct 14, 2022 at 07:18:11PM +0000, Sakari Ailus wrote:
> On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <[email protected]>
> >
> > Switch to using runtime PM for power management.
> >
> > Signed-off-by: Lad Prabhakar <[email protected]>
> > ---
> > v1->v2
> > * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> > ---
> > drivers/media/i2c/Kconfig | 2 +-
> > drivers/media/i2c/ov5645.c | 137 +++++++++++++++++++------------------
> > 2 files changed, 70 insertions(+), 69 deletions(-)
> >
> > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > index 7806d4b81716..c0edd1017fe8 100644
> > --- a/drivers/media/i2c/Kconfig
> > +++ b/drivers/media/i2c/Kconfig
> > @@ -459,7 +459,7 @@ config VIDEO_OV5640
> > config VIDEO_OV5645
> > tristate "OmniVision OV5645 sensor support"
> > depends on OF
> > - depends on I2C && VIDEO_DEV
> > + depends on I2C && PM && VIDEO_DEV
> > select MEDIA_CONTROLLER
> > select VIDEO_V4L2_SUBDEV_API
> > select V4L2_FWNODE
> > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > index 81e4e87e1821..1551690a94e0 100644
> > --- a/drivers/media/i2c/ov5645.c
> > +++ b/drivers/media/i2c/ov5645.c
> > @@ -27,6 +27,7 @@
> > #include <linux/module.h>
> > #include <linux/of.h>
> > #include <linux/of_graph.h>
> > +#include <linux/pm_runtime.h>
> > #include <linux/regulator/consumer.h>
> > #include <linux/slab.h>
> > #include <linux/types.h>
> > @@ -108,7 +109,6 @@ struct ov5645 {
> > u8 timing_tc_reg21;
> >
> > struct mutex power_lock; /* lock to protect power state */
> > - int power_count;
> >
> > struct gpio_desc *enable_gpio;
> > struct gpio_desc *rst_gpio;
> > @@ -635,8 +635,24 @@ static int ov5645_set_register_array(struct ov5645 *ov5645,
> > return 0;
> > }
> >
> > -static int ov5645_set_power_on(struct ov5645 *ov5645)
> > +static int ov5645_set_power_off(struct device *dev)
> > {
> > + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > + struct ov5645 *ov5645 = to_ov5645(sd);
> > +
> > + ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
I'm not sure this belongs here, but it can be addressed later.
> > + gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
> > + gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
> > + clk_disable_unprepare(ov5645->xclk);
> > + regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > +
> > + return 0;
> > +}
> > +
> > +static int ov5645_set_power_on(struct device *dev)
> > +{
> > + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > + struct ov5645 *ov5645 = to_ov5645(sd);
> > int ret;
> >
> > ret = regulator_bulk_enable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > @@ -658,57 +674,19 @@ static int ov5645_set_power_on(struct ov5645 *ov5645)
> >
> > msleep(20);
> >
> > - return 0;
> > -}
> > -
> > -static void ov5645_set_power_off(struct ov5645 *ov5645)
> > -{
> > - gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
> > - gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
> > - clk_disable_unprepare(ov5645->xclk);
> > - regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > -}
> > -
> > -static int ov5645_s_power(struct v4l2_subdev *sd, int on)
> > -{
> > - struct ov5645 *ov5645 = to_ov5645(sd);
> > - int ret = 0;
> > -
> > - mutex_lock(&ov5645->power_lock);
> > -
> > - /* If the power count is modified from 0 to != 0 or from != 0 to 0,
> > - * update the power state.
> > - */
> > - if (ov5645->power_count == !on) {
> > - if (on) {
> > - ret = ov5645_set_power_on(ov5645);
> > - if (ret < 0)
> > - goto exit;
> > -
> > - ret = ov5645_set_register_array(ov5645,
> > - ov5645_global_init_setting,
> > + ret = ov5645_set_register_array(ov5645, ov5645_global_init_setting,
> > ARRAY_SIZE(ov5645_global_init_setting));
> > - if (ret < 0) {
> > - dev_err(ov5645->dev,
> > - "could not set init registers\n");
> > - ov5645_set_power_off(ov5645);
> > - goto exit;
> > - }
> > -
> > - usleep_range(500, 1000);
> > - } else {
> > - ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
> > - ov5645_set_power_off(ov5645);
> > - }
> > + if (ret < 0) {
> > + dev_err(ov5645->dev, "could not set init registers\n");
> > + goto exit;
> > }
> >
> > - /* Update the power count. */
> > - ov5645->power_count += on ? 1 : -1;
> > - WARN_ON(ov5645->power_count < 0);
> > + usleep_range(500, 1000);
> >
> > -exit:
> > - mutex_unlock(&ov5645->power_lock);
> > + return 0;
> >
> > +exit:
> > + ov5645_set_power_off(dev);
> > return ret;
> > }
> >
> > @@ -795,7 +773,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> > int ret;
> >
> > mutex_lock(&ov5645->power_lock);
> > - if (!ov5645->power_count) {
> > + if (!pm_runtime_get_if_in_use(ov5645->dev)) {
> > mutex_unlock(&ov5645->power_lock);
> > return 0;
> > }
> > @@ -827,6 +805,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> > break;
> > }
> >
> > + pm_runtime_put_autosuspend(ov5645->dev);
>
> I think you'll need pm_runtime_mark_last_busy() before this. I missed this
> on the last round. Maybe in probe() too. Feel free to resend just this
> patch.
>
> > mutex_unlock(&ov5645->power_lock);
> >
> > return ret;
> > @@ -991,6 +970,10 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > int ret;
> >
> > if (enable) {
> > + ret = pm_runtime_resume_and_get(ov5645->dev);
> > + if (ret < 0)
> > + return ret;
> > +
> > ret = ov5645_set_register_array(ov5645,
> > ov5645->current_mode->data,
> > ov5645->current_mode->data_size);
> > @@ -998,22 +981,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > dev_err(ov5645->dev, "could not set mode %dx%d\n",
> > ov5645->current_mode->width,
> > ov5645->current_mode->height);
> > - return ret;
> > + goto err_rpm_put;
> > }
> > ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
> > if (ret < 0) {
> > dev_err(ov5645->dev, "could not sync v4l2 controls\n");
> > - return ret;
> > + goto err_rpm_put;
> > }
> >
> > ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
> > if (ret < 0)
> > - return ret;
> > + goto err_rpm_put;
> >
> > ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> > OV5645_SYSTEM_CTRL0_START);
> > if (ret < 0)
> > - return ret;
> > + goto err_rpm_put;
> > } else {
> > ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> > if (ret < 0)
> > @@ -1023,14 +1006,15 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > OV5645_SYSTEM_CTRL0_STOP);
> > if (ret < 0)
> > return ret;
> > + pm_runtime_put(ov5645->dev);
> > }
> >
> > return 0;
> > -}
> >
> > -static const struct v4l2_subdev_core_ops ov5645_core_ops = {
> > - .s_power = ov5645_s_power,
> > -};
> > +err_rpm_put:
> > + pm_runtime_put(ov5645->dev);
> > + return ret;
> > +}
> >
> > static const struct v4l2_subdev_video_ops ov5645_video_ops = {
> > .s_stream = ov5645_s_stream,
> > @@ -1046,7 +1030,6 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
> > };
> >
> > static const struct v4l2_subdev_ops ov5645_subdev_ops = {
> > - .core = &ov5645_core_ops,
> > .video = &ov5645_video_ops,
> > .pad = &ov5645_subdev_pad_ops,
> > };
> > @@ -1188,11 +1171,9 @@ static int ov5645_probe(struct i2c_client *client)
> > goto free_ctrl;
> > }
> >
> > - ret = ov5645_s_power(&ov5645->sd, true);
> > - if (ret < 0) {
> > - dev_err(dev, "could not power up OV5645\n");
> > + ret = ov5645_set_power_on(dev);
> > + if (ret)
> > goto free_entity;
> > - }
> >
> > ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
> > if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
> > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> >
> > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> >
> > + pm_runtime_set_active(dev);
> > + pm_runtime_get_noresume(dev);
> > + pm_runtime_enable(dev);
> > +
> > ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
> > &ov5645->aec_pk_manual);
Totally unrelated to this patch, can we drop all these register reads ?
The registers are written through he ov5645_global_init_setting array,
we know what the values are.
> > if (ret < 0) {
> > dev_err(dev, "could not read AEC/AGC mode\n");
> > ret = -ENODEV;
> > - goto power_down;
> > + goto err_pm_runtime;
> > }
> >
> > ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
> > @@ -1222,7 +1207,7 @@ static int ov5645_probe(struct i2c_client *client)
> > if (ret < 0) {
> > dev_err(dev, "could not read vflip value\n");
> > ret = -ENODEV;
> > - goto power_down;
> > + goto err_pm_runtime;
> > }
> >
> > ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
> > @@ -1230,23 +1215,30 @@ static int ov5645_probe(struct i2c_client *client)
> > if (ret < 0) {
> > dev_err(dev, "could not read hflip value\n");
> > ret = -ENODEV;
> > - goto power_down;
> > + goto err_pm_runtime;
> > }
> >
> > - ov5645_s_power(&ov5645->sd, false);
> > -
> > ret = v4l2_async_register_subdev(&ov5645->sd);
> > if (ret < 0) {
> > dev_err(dev, "could not register v4l2 device\n");
> > + pm_runtime_disable(dev);
> > + pm_runtime_set_suspended(dev);
> > goto free_entity;
This looks weird, why do we need special handling of runtime PM here,
instead of just jumping to err_pm_runtime ?
Reviewed-by: Laurent Pinchart <[email protected]>
> > }
> >
> > + pm_runtime_set_autosuspend_delay(dev, 1000);
> > + pm_runtime_use_autosuspend(dev);
> > + pm_runtime_put_autosuspend(dev);
> > +
> > ov5645_entity_init_cfg(&ov5645->sd, NULL);
> >
> > return 0;
> >
> > +err_pm_runtime:
> > + pm_runtime_disable(dev);
> > + pm_runtime_put_noidle(dev);
> > power_down:
> > - ov5645_s_power(&ov5645->sd, false);
> > + ov5645_set_power_off(dev);
> > free_entity:
> > media_entity_cleanup(&ov5645->sd.entity);
> > free_ctrl:
> > @@ -1264,6 +1256,10 @@ static void ov5645_remove(struct i2c_client *client)
> > v4l2_async_unregister_subdev(&ov5645->sd);
> > media_entity_cleanup(&ov5645->sd.entity);
> > v4l2_ctrl_handler_free(&ov5645->ctrls);
> > + pm_runtime_disable(ov5645->dev);
> > + if (!pm_runtime_status_suspended(ov5645->dev))
> > + ov5645_set_power_off(ov5645->dev);
> > + pm_runtime_set_suspended(ov5645->dev);
> > mutex_destroy(&ov5645->power_lock);
> > }
> >
> > @@ -1279,10 +1275,15 @@ static const struct of_device_id ov5645_of_match[] = {
> > };
> > MODULE_DEVICE_TABLE(of, ov5645_of_match);
> >
> > +static const struct dev_pm_ops ov5645_pm_ops = {
> > + SET_RUNTIME_PM_OPS(ov5645_set_power_off, ov5645_set_power_on, NULL)
> > +};
> > +
> > static struct i2c_driver ov5645_i2c_driver = {
> > .driver = {
> > .of_match_table = ov5645_of_match,
> > .name = "ov5645",
> > + .pm = &ov5645_pm_ops,
> > },
> > .probe_new = ov5645_probe,
> > .remove = ov5645_remove,
--
Regards,
Laurent Pinchart
One more comment.
On Sat, Oct 15, 2022 at 09:05:08AM +0300, Laurent Pinchart wrote:
> On Fri, Oct 14, 2022 at 07:18:11PM +0000, Sakari Ailus wrote:
> > On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > > From: Lad Prabhakar <[email protected]>
> > >
> > > Switch to using runtime PM for power management.
> > >
> > > Signed-off-by: Lad Prabhakar <[email protected]>
> > > ---
> > > v1->v2
> > > * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> > > ---
> > > drivers/media/i2c/Kconfig | 2 +-
> > > drivers/media/i2c/ov5645.c | 137 +++++++++++++++++++------------------
> > > 2 files changed, 70 insertions(+), 69 deletions(-)
> > >
> > > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > > index 7806d4b81716..c0edd1017fe8 100644
> > > --- a/drivers/media/i2c/Kconfig
> > > +++ b/drivers/media/i2c/Kconfig
> > > @@ -459,7 +459,7 @@ config VIDEO_OV5640
> > > config VIDEO_OV5645
> > > tristate "OmniVision OV5645 sensor support"
> > > depends on OF
> > > - depends on I2C && VIDEO_DEV
> > > + depends on I2C && PM && VIDEO_DEV
> > > select MEDIA_CONTROLLER
> > > select VIDEO_V4L2_SUBDEV_API
> > > select V4L2_FWNODE
> > > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > > index 81e4e87e1821..1551690a94e0 100644
> > > --- a/drivers/media/i2c/ov5645.c
> > > +++ b/drivers/media/i2c/ov5645.c
> > > @@ -27,6 +27,7 @@
> > > #include <linux/module.h>
> > > #include <linux/of.h>
> > > #include <linux/of_graph.h>
> > > +#include <linux/pm_runtime.h>
> > > #include <linux/regulator/consumer.h>
> > > #include <linux/slab.h>
> > > #include <linux/types.h>
> > > @@ -108,7 +109,6 @@ struct ov5645 {
> > > u8 timing_tc_reg21;
> > >
> > > struct mutex power_lock; /* lock to protect power state */
> > > - int power_count;
> > >
> > > struct gpio_desc *enable_gpio;
> > > struct gpio_desc *rst_gpio;
> > > @@ -635,8 +635,24 @@ static int ov5645_set_register_array(struct ov5645 *ov5645,
> > > return 0;
> > > }
> > >
> > > -static int ov5645_set_power_on(struct ov5645 *ov5645)
> > > +static int ov5645_set_power_off(struct device *dev)
> > > {
> > > + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > > + struct ov5645 *ov5645 = to_ov5645(sd);
> > > +
> > > + ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
>
> I'm not sure this belongs here, but it can be addressed later.
>
> > > + gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
> > > + gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
> > > + clk_disable_unprepare(ov5645->xclk);
> > > + regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int ov5645_set_power_on(struct device *dev)
> > > +{
> > > + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > > + struct ov5645 *ov5645 = to_ov5645(sd);
> > > int ret;
> > >
> > > ret = regulator_bulk_enable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > > @@ -658,57 +674,19 @@ static int ov5645_set_power_on(struct ov5645 *ov5645)
> > >
> > > msleep(20);
> > >
> > > - return 0;
> > > -}
> > > -
> > > -static void ov5645_set_power_off(struct ov5645 *ov5645)
> > > -{
> > > - gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
> > > - gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
> > > - clk_disable_unprepare(ov5645->xclk);
> > > - regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > > -}
> > > -
> > > -static int ov5645_s_power(struct v4l2_subdev *sd, int on)
> > > -{
> > > - struct ov5645 *ov5645 = to_ov5645(sd);
> > > - int ret = 0;
> > > -
> > > - mutex_lock(&ov5645->power_lock);
> > > -
> > > - /* If the power count is modified from 0 to != 0 or from != 0 to 0,
> > > - * update the power state.
> > > - */
> > > - if (ov5645->power_count == !on) {
> > > - if (on) {
> > > - ret = ov5645_set_power_on(ov5645);
> > > - if (ret < 0)
> > > - goto exit;
> > > -
> > > - ret = ov5645_set_register_array(ov5645,
> > > - ov5645_global_init_setting,
> > > + ret = ov5645_set_register_array(ov5645, ov5645_global_init_setting,
> > > ARRAY_SIZE(ov5645_global_init_setting));
> > > - if (ret < 0) {
> > > - dev_err(ov5645->dev,
> > > - "could not set init registers\n");
> > > - ov5645_set_power_off(ov5645);
> > > - goto exit;
> > > - }
> > > -
> > > - usleep_range(500, 1000);
> > > - } else {
> > > - ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
> > > - ov5645_set_power_off(ov5645);
> > > - }
> > > + if (ret < 0) {
> > > + dev_err(ov5645->dev, "could not set init registers\n");
> > > + goto exit;
> > > }
> > >
> > > - /* Update the power count. */
> > > - ov5645->power_count += on ? 1 : -1;
> > > - WARN_ON(ov5645->power_count < 0);
> > > + usleep_range(500, 1000);
> > >
> > > -exit:
> > > - mutex_unlock(&ov5645->power_lock);
> > > + return 0;
> > >
> > > +exit:
> > > + ov5645_set_power_off(dev);
> > > return ret;
> > > }
> > >
> > > @@ -795,7 +773,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> > > int ret;
> > >
> > > mutex_lock(&ov5645->power_lock);
> > > - if (!ov5645->power_count) {
> > > + if (!pm_runtime_get_if_in_use(ov5645->dev)) {
> > > mutex_unlock(&ov5645->power_lock);
> > > return 0;
> > > }
> > > @@ -827,6 +805,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> > > break;
> > > }
> > >
> > > + pm_runtime_put_autosuspend(ov5645->dev);
> >
> > I think you'll need pm_runtime_mark_last_busy() before this. I missed this
> > on the last round. Maybe in probe() too. Feel free to resend just this
> > patch.
> >
> > > mutex_unlock(&ov5645->power_lock);
> > >
> > > return ret;
> > > @@ -991,6 +970,10 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > > int ret;
> > >
> > > if (enable) {
> > > + ret = pm_runtime_resume_and_get(ov5645->dev);
> > > + if (ret < 0)
> > > + return ret;
> > > +
> > > ret = ov5645_set_register_array(ov5645,
> > > ov5645->current_mode->data,
> > > ov5645->current_mode->data_size);
> > > @@ -998,22 +981,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > > dev_err(ov5645->dev, "could not set mode %dx%d\n",
> > > ov5645->current_mode->width,
> > > ov5645->current_mode->height);
> > > - return ret;
> > > + goto err_rpm_put;
> > > }
> > > ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
> > > if (ret < 0) {
> > > dev_err(ov5645->dev, "could not sync v4l2 controls\n");
> > > - return ret;
> > > + goto err_rpm_put;
> > > }
> > >
> > > ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
> > > if (ret < 0)
> > > - return ret;
> > > + goto err_rpm_put;
> > >
> > > ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> > > OV5645_SYSTEM_CTRL0_START);
> > > if (ret < 0)
> > > - return ret;
> > > + goto err_rpm_put;
> > > } else {
> > > ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> > > if (ret < 0)
> > > @@ -1023,14 +1006,15 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > > OV5645_SYSTEM_CTRL0_STOP);
> > > if (ret < 0)
> > > return ret;
> > > + pm_runtime_put(ov5645->dev);
This should be pm_runtime_put_autosuspend(), with a
pm_runtime_mark_last_busy() call too.
> > > }
> > >
> > > return 0;
> > > -}
> > >
> > > -static const struct v4l2_subdev_core_ops ov5645_core_ops = {
> > > - .s_power = ov5645_s_power,
> > > -};
> > > +err_rpm_put:
> > > + pm_runtime_put(ov5645->dev);
Here I would go for pm_runtime_put_sync(), as a failure to start the
stream would benefit from forcing power being cut off before the user
tries again.
> > > + return ret;
> > > +}
> > >
> > > static const struct v4l2_subdev_video_ops ov5645_video_ops = {
> > > .s_stream = ov5645_s_stream,
> > > @@ -1046,7 +1030,6 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
> > > };
> > >
> > > static const struct v4l2_subdev_ops ov5645_subdev_ops = {
> > > - .core = &ov5645_core_ops,
> > > .video = &ov5645_video_ops,
> > > .pad = &ov5645_subdev_pad_ops,
> > > };
> > > @@ -1188,11 +1171,9 @@ static int ov5645_probe(struct i2c_client *client)
> > > goto free_ctrl;
> > > }
> > >
> > > - ret = ov5645_s_power(&ov5645->sd, true);
> > > - if (ret < 0) {
> > > - dev_err(dev, "could not power up OV5645\n");
> > > + ret = ov5645_set_power_on(dev);
> > > + if (ret)
> > > goto free_entity;
> > > - }
> > >
> > > ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
> > > if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
> > > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> > >
> > > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> > >
> > > + pm_runtime_set_active(dev);
> > > + pm_runtime_get_noresume(dev);
> > > + pm_runtime_enable(dev);
> > > +
> > > ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
> > > &ov5645->aec_pk_manual);
>
> Totally unrelated to this patch, can we drop all these register reads ?
> The registers are written through he ov5645_global_init_setting array,
> we know what the values are.
>
> > > if (ret < 0) {
> > > dev_err(dev, "could not read AEC/AGC mode\n");
> > > ret = -ENODEV;
> > > - goto power_down;
> > > + goto err_pm_runtime;
> > > }
> > >
> > > ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
> > > @@ -1222,7 +1207,7 @@ static int ov5645_probe(struct i2c_client *client)
> > > if (ret < 0) {
> > > dev_err(dev, "could not read vflip value\n");
> > > ret = -ENODEV;
> > > - goto power_down;
> > > + goto err_pm_runtime;
> > > }
> > >
> > > ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
> > > @@ -1230,23 +1215,30 @@ static int ov5645_probe(struct i2c_client *client)
> > > if (ret < 0) {
> > > dev_err(dev, "could not read hflip value\n");
> > > ret = -ENODEV;
> > > - goto power_down;
> > > + goto err_pm_runtime;
> > > }
> > >
> > > - ov5645_s_power(&ov5645->sd, false);
> > > -
> > > ret = v4l2_async_register_subdev(&ov5645->sd);
> > > if (ret < 0) {
> > > dev_err(dev, "could not register v4l2 device\n");
> > > + pm_runtime_disable(dev);
> > > + pm_runtime_set_suspended(dev);
> > > goto free_entity;
>
> This looks weird, why do we need special handling of runtime PM here,
> instead of just jumping to err_pm_runtime ?
>
> Reviewed-by: Laurent Pinchart <[email protected]>
>
> > > }
> > >
> > > + pm_runtime_set_autosuspend_delay(dev, 1000);
> > > + pm_runtime_use_autosuspend(dev);
> > > + pm_runtime_put_autosuspend(dev);
> > > +
> > > ov5645_entity_init_cfg(&ov5645->sd, NULL);
> > >
> > > return 0;
> > >
> > > +err_pm_runtime:
> > > + pm_runtime_disable(dev);
> > > + pm_runtime_put_noidle(dev);
> > > power_down:
> > > - ov5645_s_power(&ov5645->sd, false);
> > > + ov5645_set_power_off(dev);
> > > free_entity:
> > > media_entity_cleanup(&ov5645->sd.entity);
> > > free_ctrl:
> > > @@ -1264,6 +1256,10 @@ static void ov5645_remove(struct i2c_client *client)
> > > v4l2_async_unregister_subdev(&ov5645->sd);
> > > media_entity_cleanup(&ov5645->sd.entity);
> > > v4l2_ctrl_handler_free(&ov5645->ctrls);
> > > + pm_runtime_disable(ov5645->dev);
> > > + if (!pm_runtime_status_suspended(ov5645->dev))
> > > + ov5645_set_power_off(ov5645->dev);
> > > + pm_runtime_set_suspended(ov5645->dev);
> > > mutex_destroy(&ov5645->power_lock);
> > > }
> > >
> > > @@ -1279,10 +1275,15 @@ static const struct of_device_id ov5645_of_match[] = {
> > > };
> > > MODULE_DEVICE_TABLE(of, ov5645_of_match);
> > >
> > > +static const struct dev_pm_ops ov5645_pm_ops = {
> > > + SET_RUNTIME_PM_OPS(ov5645_set_power_off, ov5645_set_power_on, NULL)
> > > +};
> > > +
> > > static struct i2c_driver ov5645_i2c_driver = {
> > > .driver = {
> > > .of_match_table = ov5645_of_match,
> > > .name = "ov5645",
> > > + .pm = &ov5645_pm_ops,
> > > },
> > > .probe_new = ov5645_probe,
> > > .remove = ov5645_remove,
--
Regards,
Laurent Pinchart
Hi Laurent,
Thank you for the review.
On Sat, Oct 15, 2022 at 7:25 AM Laurent Pinchart
<[email protected]> wrote:
>
> One more comment.
>
> On Sat, Oct 15, 2022 at 09:05:08AM +0300, Laurent Pinchart wrote:
> > On Fri, Oct 14, 2022 at 07:18:11PM +0000, Sakari Ailus wrote:
> > > On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > > > From: Lad Prabhakar <[email protected]>
> > > >
> > > > Switch to using runtime PM for power management.
> > > >
> > > > Signed-off-by: Lad Prabhakar <[email protected]>
> > > > ---
> > > > v1->v2
> > > > * Moved pm_runtime_*_autosuspend() calls after registering the subdev.
> > > > ---
> > > > drivers/media/i2c/Kconfig | 2 +-
> > > > drivers/media/i2c/ov5645.c | 137 +++++++++++++++++++------------------
> > > > 2 files changed, 70 insertions(+), 69 deletions(-)
> > > >
> > > > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > > > index 7806d4b81716..c0edd1017fe8 100644
> > > > --- a/drivers/media/i2c/Kconfig
> > > > +++ b/drivers/media/i2c/Kconfig
> > > > @@ -459,7 +459,7 @@ config VIDEO_OV5640
> > > > config VIDEO_OV5645
> > > > tristate "OmniVision OV5645 sensor support"
> > > > depends on OF
> > > > - depends on I2C && VIDEO_DEV
> > > > + depends on I2C && PM && VIDEO_DEV
> > > > select MEDIA_CONTROLLER
> > > > select VIDEO_V4L2_SUBDEV_API
> > > > select V4L2_FWNODE
> > > > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > > > index 81e4e87e1821..1551690a94e0 100644
> > > > --- a/drivers/media/i2c/ov5645.c
> > > > +++ b/drivers/media/i2c/ov5645.c
> > > > @@ -27,6 +27,7 @@
> > > > #include <linux/module.h>
> > > > #include <linux/of.h>
> > > > #include <linux/of_graph.h>
> > > > +#include <linux/pm_runtime.h>
> > > > #include <linux/regulator/consumer.h>
> > > > #include <linux/slab.h>
> > > > #include <linux/types.h>
> > > > @@ -108,7 +109,6 @@ struct ov5645 {
> > > > u8 timing_tc_reg21;
> > > >
> > > > struct mutex power_lock; /* lock to protect power state */
> > > > - int power_count;
> > > >
> > > > struct gpio_desc *enable_gpio;
> > > > struct gpio_desc *rst_gpio;
> > > > @@ -635,8 +635,24 @@ static int ov5645_set_register_array(struct ov5645 *ov5645,
> > > > return 0;
> > > > }
> > > >
> > > > -static int ov5645_set_power_on(struct ov5645 *ov5645)
> > > > +static int ov5645_set_power_off(struct device *dev)
> > > > {
> > > > + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > > > + struct ov5645 *ov5645 = to_ov5645(sd);
> > > > +
> > > > + ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
> >
> > I'm not sure this belongs here, but it can be addressed later.
> >
> > > > + gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
> > > > + gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
> > > > + clk_disable_unprepare(ov5645->xclk);
> > > > + regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +static int ov5645_set_power_on(struct device *dev)
> > > > +{
> > > > + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > > > + struct ov5645 *ov5645 = to_ov5645(sd);
> > > > int ret;
> > > >
> > > > ret = regulator_bulk_enable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > > > @@ -658,57 +674,19 @@ static int ov5645_set_power_on(struct ov5645 *ov5645)
> > > >
> > > > msleep(20);
> > > >
> > > > - return 0;
> > > > -}
> > > > -
> > > > -static void ov5645_set_power_off(struct ov5645 *ov5645)
> > > > -{
> > > > - gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
> > > > - gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
> > > > - clk_disable_unprepare(ov5645->xclk);
> > > > - regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
> > > > -}
> > > > -
> > > > -static int ov5645_s_power(struct v4l2_subdev *sd, int on)
> > > > -{
> > > > - struct ov5645 *ov5645 = to_ov5645(sd);
> > > > - int ret = 0;
> > > > -
> > > > - mutex_lock(&ov5645->power_lock);
> > > > -
> > > > - /* If the power count is modified from 0 to != 0 or from != 0 to 0,
> > > > - * update the power state.
> > > > - */
> > > > - if (ov5645->power_count == !on) {
> > > > - if (on) {
> > > > - ret = ov5645_set_power_on(ov5645);
> > > > - if (ret < 0)
> > > > - goto exit;
> > > > -
> > > > - ret = ov5645_set_register_array(ov5645,
> > > > - ov5645_global_init_setting,
> > > > + ret = ov5645_set_register_array(ov5645, ov5645_global_init_setting,
> > > > ARRAY_SIZE(ov5645_global_init_setting));
> > > > - if (ret < 0) {
> > > > - dev_err(ov5645->dev,
> > > > - "could not set init registers\n");
> > > > - ov5645_set_power_off(ov5645);
> > > > - goto exit;
> > > > - }
> > > > -
> > > > - usleep_range(500, 1000);
> > > > - } else {
> > > > - ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
> > > > - ov5645_set_power_off(ov5645);
> > > > - }
> > > > + if (ret < 0) {
> > > > + dev_err(ov5645->dev, "could not set init registers\n");
> > > > + goto exit;
> > > > }
> > > >
> > > > - /* Update the power count. */
> > > > - ov5645->power_count += on ? 1 : -1;
> > > > - WARN_ON(ov5645->power_count < 0);
> > > > + usleep_range(500, 1000);
> > > >
> > > > -exit:
> > > > - mutex_unlock(&ov5645->power_lock);
> > > > + return 0;
> > > >
> > > > +exit:
> > > > + ov5645_set_power_off(dev);
> > > > return ret;
> > > > }
> > > >
> > > > @@ -795,7 +773,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> > > > int ret;
> > > >
> > > > mutex_lock(&ov5645->power_lock);
> > > > - if (!ov5645->power_count) {
> > > > + if (!pm_runtime_get_if_in_use(ov5645->dev)) {
> > > > mutex_unlock(&ov5645->power_lock);
> > > > return 0;
> > > > }
> > > > @@ -827,6 +805,7 @@ static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
> > > > break;
> > > > }
> > > >
> > > > + pm_runtime_put_autosuspend(ov5645->dev);
> > >
> > > I think you'll need pm_runtime_mark_last_busy() before this. I missed this
> > > on the last round. Maybe in probe() too. Feel free to resend just this
> > > patch.
> > >
> > > > mutex_unlock(&ov5645->power_lock);
> > > >
> > > > return ret;
> > > > @@ -991,6 +970,10 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > > > int ret;
> > > >
> > > > if (enable) {
> > > > + ret = pm_runtime_resume_and_get(ov5645->dev);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > +
> > > > ret = ov5645_set_register_array(ov5645,
> > > > ov5645->current_mode->data,
> > > > ov5645->current_mode->data_size);
> > > > @@ -998,22 +981,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > > > dev_err(ov5645->dev, "could not set mode %dx%d\n",
> > > > ov5645->current_mode->width,
> > > > ov5645->current_mode->height);
> > > > - return ret;
> > > > + goto err_rpm_put;
> > > > }
> > > > ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
> > > > if (ret < 0) {
> > > > dev_err(ov5645->dev, "could not sync v4l2 controls\n");
> > > > - return ret;
> > > > + goto err_rpm_put;
> > > > }
> > > >
> > > > ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
> > > > if (ret < 0)
> > > > - return ret;
> > > > + goto err_rpm_put;
> > > >
> > > > ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> > > > OV5645_SYSTEM_CTRL0_START);
> > > > if (ret < 0)
> > > > - return ret;
> > > > + goto err_rpm_put;
> > > > } else {
> > > > ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> > > > if (ret < 0)
> > > > @@ -1023,14 +1006,15 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> > > > OV5645_SYSTEM_CTRL0_STOP);
> > > > if (ret < 0)
> > > > return ret;
> > > > + pm_runtime_put(ov5645->dev);
>
> This should be pm_runtime_put_autosuspend(), with a
> pm_runtime_mark_last_busy() call too.
>
OK.
> > > > }
> > > >
> > > > return 0;
> > > > -}
> > > >
> > > > -static const struct v4l2_subdev_core_ops ov5645_core_ops = {
> > > > - .s_power = ov5645_s_power,
> > > > -};
> > > > +err_rpm_put:
> > > > + pm_runtime_put(ov5645->dev);
>
> Here I would go for pm_runtime_put_sync(), as a failure to start the
> stream would benefit from forcing power being cut off before the user
> tries again.
>
Agreed.
> > > > + return ret;
> > > > +}
> > > >
> > > > static const struct v4l2_subdev_video_ops ov5645_video_ops = {
> > > > .s_stream = ov5645_s_stream,
> > > > @@ -1046,7 +1030,6 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
> > > > };
> > > >
> > > > static const struct v4l2_subdev_ops ov5645_subdev_ops = {
> > > > - .core = &ov5645_core_ops,
> > > > .video = &ov5645_video_ops,
> > > > .pad = &ov5645_subdev_pad_ops,
> > > > };
> > > > @@ -1188,11 +1171,9 @@ static int ov5645_probe(struct i2c_client *client)
> > > > goto free_ctrl;
> > > > }
> > > >
> > > > - ret = ov5645_s_power(&ov5645->sd, true);
> > > > - if (ret < 0) {
> > > > - dev_err(dev, "could not power up OV5645\n");
> > > > + ret = ov5645_set_power_on(dev);
> > > > + if (ret)
> > > > goto free_entity;
> > > > - }
> > > >
> > > > ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
> > > > if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
> > > > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> > > >
> > > > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> > > >
> > > > + pm_runtime_set_active(dev);
> > > > + pm_runtime_get_noresume(dev);
> > > > + pm_runtime_enable(dev);
> > > > +
> > > > ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
> > > > &ov5645->aec_pk_manual);
> >
> > Totally unrelated to this patch, can we drop all these register reads ?
> > The registers are written through he ov5645_global_init_setting array,
> > we know what the values are.
> >
Indeed, I'll have a closer look while working on the subdev state for
this driver.
> > > > if (ret < 0) {
> > > > dev_err(dev, "could not read AEC/AGC mode\n");
> > > > ret = -ENODEV;
> > > > - goto power_down;
> > > > + goto err_pm_runtime;
> > > > }
> > > >
> > > > ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
> > > > @@ -1222,7 +1207,7 @@ static int ov5645_probe(struct i2c_client *client)
> > > > if (ret < 0) {
> > > > dev_err(dev, "could not read vflip value\n");
> > > > ret = -ENODEV;
> > > > - goto power_down;
> > > > + goto err_pm_runtime;
> > > > }
> > > >
> > > > ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
> > > > @@ -1230,23 +1215,30 @@ static int ov5645_probe(struct i2c_client *client)
> > > > if (ret < 0) {
> > > > dev_err(dev, "could not read hflip value\n");
> > > > ret = -ENODEV;
> > > > - goto power_down;
> > > > + goto err_pm_runtime;
> > > > }
> > > >
> > > > - ov5645_s_power(&ov5645->sd, false);
> > > > -
> > > > ret = v4l2_async_register_subdev(&ov5645->sd);
> > > > if (ret < 0) {
> > > > dev_err(dev, "could not register v4l2 device\n");
> > > > + pm_runtime_disable(dev);
> > > > + pm_runtime_set_suspended(dev);
> > > > goto free_entity;
> >
> > This looks weird, why do we need special handling of runtime PM here,
> > instead of just jumping to err_pm_runtime ?
> >
Agreed, I have fixed that now.
> > Reviewed-by: Laurent Pinchart <[email protected]>
> >
Cheers,
Prabhakar
Hi Prabhakar,
One more comment.
On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
>
> dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
>
> + pm_runtime_set_active(dev);
> + pm_runtime_get_noresume(dev);
> + pm_runtime_enable(dev);
You won't gain anything by eanbling runtime PM here. Just move it to the
end of the function before the rest of the calls. Error handling becomes
more simple.
> +
> ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
> &ov5645->aec_pk_manual);
> if (ret < 0) {
> dev_err(dev, "could not read AEC/AGC mode\n");
> ret = -ENODEV;
> - goto power_down;
> + goto err_pm_runtime;
> }
>
> ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
> @@ -1222,7 +1207,7 @@ static int ov5645_probe(struct i2c_client *client)
> if (ret < 0) {
> dev_err(dev, "could not read vflip value\n");
> ret = -ENODEV;
> - goto power_down;
> + goto err_pm_runtime;
> }
>
> ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
> @@ -1230,23 +1215,30 @@ static int ov5645_probe(struct i2c_client *client)
> if (ret < 0) {
> dev_err(dev, "could not read hflip value\n");
> ret = -ENODEV;
> - goto power_down;
> + goto err_pm_runtime;
> }
>
> - ov5645_s_power(&ov5645->sd, false);
> -
> ret = v4l2_async_register_subdev(&ov5645->sd);
> if (ret < 0) {
> dev_err(dev, "could not register v4l2 device\n");
> + pm_runtime_disable(dev);
> + pm_runtime_set_suspended(dev);
> goto free_entity;
> }
>
> + pm_runtime_set_autosuspend_delay(dev, 1000);
> + pm_runtime_use_autosuspend(dev);
> + pm_runtime_put_autosuspend(dev);
> +
> ov5645_entity_init_cfg(&ov5645->sd, NULL);
>
> return 0;
>
> +err_pm_runtime:
> + pm_runtime_disable(dev);
> + pm_runtime_put_noidle(dev);
> power_down:
> - ov5645_s_power(&ov5645->sd, false);
> + ov5645_set_power_off(dev);
> free_entity:
> media_entity_cleanup(&ov5645->sd.entity);
> free_ctrl:
--
Kind regards,
Sakari Ailus
Hi Sakari,
On Thu, Oct 27, 2022 at 12:20 PM Sakari Ailus
<[email protected]> wrote:
>
> Hi Prabhakar,
>
> One more comment.
>
> On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> >
> > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> >
> > + pm_runtime_set_active(dev);
> > + pm_runtime_get_noresume(dev);
> > + pm_runtime_enable(dev);
>
> You won't gain anything by eanbling runtime PM here. Just move it to the
> end of the function before the rest of the calls. Error handling becomes
> more simple.
>
If I move the above calls below I get the below warning:
[ 2.633386] ov5645 0-003c: Runtime PM usage count underflow!
This is because of the last patch which moves ov5645_entity_init_cfg()
before registering the subdev. ov5645_entity_init_cfg() calls s_ctrl
due to which we are seeing the above message. Please let me know how
to proceed on this.
Cheers,
Prabhakar
Hi Prabhakar,
On Thu, Oct 27, 2022 at 01:01:52PM +0100, Lad, Prabhakar wrote:
> Hi Sakari,
>
> On Thu, Oct 27, 2022 at 12:20 PM Sakari Ailus
> <[email protected]> wrote:
> >
> > Hi Prabhakar,
> >
> > One more comment.
> >
> > On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> > >
> > > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> > >
> > > + pm_runtime_set_active(dev);
> > > + pm_runtime_get_noresume(dev);
> > > + pm_runtime_enable(dev);
> >
> > You won't gain anything by eanbling runtime PM here. Just move it to the
> > end of the function before the rest of the calls. Error handling becomes
> > more simple.
> >
> If I move the above calls below I get the below warning:
>
> [ 2.633386] ov5645 0-003c: Runtime PM usage count underflow!
>
> This is because of the last patch which moves ov5645_entity_init_cfg()
> before registering the subdev. ov5645_entity_init_cfg() calls s_ctrl
> due to which we are seeing the above message. Please let me know how
> to proceed on this.
Ah. Yes, this is a problem with the usage pattern of
pm_runtime_get_if_in_use(). But please don't change that.
You can still move enabling runtime PM later in the function.
--
Kind regards,
Sakari Ailus
Hi Sakari,
On Thu, Oct 27, 2022 at 1:47 PM Sakari Ailus
<[email protected]> wrote:
>
> Hi Prabhakar,
>
> On Thu, Oct 27, 2022 at 01:01:52PM +0100, Lad, Prabhakar wrote:
> > Hi Sakari,
> >
> > On Thu, Oct 27, 2022 at 12:20 PM Sakari Ailus
> > <[email protected]> wrote:
> > >
> > > Hi Prabhakar,
> > >
> > > One more comment.
> > >
> > > On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > > > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> > > >
> > > > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> > > >
> > > > + pm_runtime_set_active(dev);
> > > > + pm_runtime_get_noresume(dev);
> > > > + pm_runtime_enable(dev);
> > >
> > > You won't gain anything by eanbling runtime PM here. Just move it to the
> > > end of the function before the rest of the calls. Error handling becomes
> > > more simple.
> > >
> > If I move the above calls below I get the below warning:
> >
> > [ 2.633386] ov5645 0-003c: Runtime PM usage count underflow!
> >
> > This is because of the last patch which moves ov5645_entity_init_cfg()
> > before registering the subdev. ov5645_entity_init_cfg() calls s_ctrl
> > due to which we are seeing the above message. Please let me know how
> > to proceed on this.
>
> Ah. Yes, this is a problem with the usage pattern of
> pm_runtime_get_if_in_use(). But please don't change that.
>
> You can still move enabling runtime PM later in the function.
>
Agreed, the final version looks like below:
pm_runtime_set_active(dev);
pm_runtime_get_noresume(dev);
ov5645_entity_init_cfg(&ov5645->sd, NULL);
ret = v4l2_async_register_subdev(&ov5645->sd);
if (ret < 0) {
dev_err(dev, "could not register v4l2 device\n");
goto err_pm_runtime;
}
pm_runtime_set_autosuspend_delay(dev, 1000);
pm_runtime_use_autosuspend(dev);
pm_runtime_enable(dev);
Cheers,
Prabhakar
Hi Prabhakar,
On Thu, Oct 27, 2022 at 05:32:07PM +0100, Lad, Prabhakar wrote:
> Hi Sakari,
>
> On Thu, Oct 27, 2022 at 1:47 PM Sakari Ailus
> <[email protected]> wrote:
> >
> > Hi Prabhakar,
> >
> > On Thu, Oct 27, 2022 at 01:01:52PM +0100, Lad, Prabhakar wrote:
> > > Hi Sakari,
> > >
> > > On Thu, Oct 27, 2022 at 12:20 PM Sakari Ailus
> > > <[email protected]> wrote:
> > > >
> > > > Hi Prabhakar,
> > > >
> > > > One more comment.
> > > >
> > > > On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > > > > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> > > > >
> > > > > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> > > > >
> > > > > + pm_runtime_set_active(dev);
> > > > > + pm_runtime_get_noresume(dev);
> > > > > + pm_runtime_enable(dev);
> > > >
> > > > You won't gain anything by eanbling runtime PM here. Just move it to the
> > > > end of the function before the rest of the calls. Error handling becomes
> > > > more simple.
> > > >
> > > If I move the above calls below I get the below warning:
> > >
> > > [ 2.633386] ov5645 0-003c: Runtime PM usage count underflow!
> > >
> > > This is because of the last patch which moves ov5645_entity_init_cfg()
> > > before registering the subdev. ov5645_entity_init_cfg() calls s_ctrl
> > > due to which we are seeing the above message. Please let me know how
> > > to proceed on this.
> >
> > Ah. Yes, this is a problem with the usage pattern of
> > pm_runtime_get_if_in_use(). But please don't change that.
> >
> > You can still move enabling runtime PM later in the function.
> >
> Agreed, the final version looks like below:
>
> pm_runtime_set_active(dev);
> pm_runtime_get_noresume(dev);
>
You'll have to enable runtime PM here, before pm_runtime_get_if_in_use()
gets called.
I'll see if it could be made to work in a sensible way when runtime PM
isn't enabled yet.
> ov5645_entity_init_cfg(&ov5645->sd, NULL);
>
> ret = v4l2_async_register_subdev(&ov5645->sd);
> if (ret < 0) {
> dev_err(dev, "could not register v4l2 device\n");
> goto err_pm_runtime;
> }
>
> pm_runtime_set_autosuspend_delay(dev, 1000);
> pm_runtime_use_autosuspend(dev);
> pm_runtime_enable(dev);
--
Kind regards,
Sakari Ailus
Hi Sakari,
On Thu, Oct 27, 2022 at 7:45 PM Sakari Ailus
<[email protected]> wrote:
>
> Hi Prabhakar,
>
> On Thu, Oct 27, 2022 at 05:32:07PM +0100, Lad, Prabhakar wrote:
> > Hi Sakari,
> >
> > On Thu, Oct 27, 2022 at 1:47 PM Sakari Ailus
> > <[email protected]> wrote:
> > >
> > > Hi Prabhakar,
> > >
> > > On Thu, Oct 27, 2022 at 01:01:52PM +0100, Lad, Prabhakar wrote:
> > > > Hi Sakari,
> > > >
> > > > On Thu, Oct 27, 2022 at 12:20 PM Sakari Ailus
> > > > <[email protected]> wrote:
> > > > >
> > > > > Hi Prabhakar,
> > > > >
> > > > > One more comment.
> > > > >
> > > > > On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > > > > > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> > > > > >
> > > > > > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> > > > > >
> > > > > > + pm_runtime_set_active(dev);
> > > > > > + pm_runtime_get_noresume(dev);
> > > > > > + pm_runtime_enable(dev);
> > > > >
> > > > > You won't gain anything by eanbling runtime PM here. Just move it to the
> > > > > end of the function before the rest of the calls. Error handling becomes
> > > > > more simple.
> > > > >
> > > > If I move the above calls below I get the below warning:
> > > >
> > > > [ 2.633386] ov5645 0-003c: Runtime PM usage count underflow!
> > > >
> > > > This is because of the last patch which moves ov5645_entity_init_cfg()
> > > > before registering the subdev. ov5645_entity_init_cfg() calls s_ctrl
> > > > due to which we are seeing the above message. Please let me know how
> > > > to proceed on this.
> > >
> > > Ah. Yes, this is a problem with the usage pattern of
> > > pm_runtime_get_if_in_use(). But please don't change that.
> > >
> > > You can still move enabling runtime PM later in the function.
> > >
> > Agreed, the final version looks like below:
> >
> > pm_runtime_set_active(dev);
> > pm_runtime_get_noresume(dev);
> >
>
> You'll have to enable runtime PM here, before pm_runtime_get_if_in_use()
> gets called.
>
> I'll see if it could be made to work in a sensible way when runtime PM
> isn't enabled yet.
>
Agreed, I'll send out v3 after fixing the comments.
Cheers,
Prabhakar
Hi Prabhakar,
On Thu, Oct 27, 2022 at 06:37:58PM +0000, Sakari Ailus wrote:
> Hi Prabhakar,
>
> On Thu, Oct 27, 2022 at 05:32:07PM +0100, Lad, Prabhakar wrote:
> > Hi Sakari,
> >
> > On Thu, Oct 27, 2022 at 1:47 PM Sakari Ailus
> > <[email protected]> wrote:
> > >
> > > Hi Prabhakar,
> > >
> > > On Thu, Oct 27, 2022 at 01:01:52PM +0100, Lad, Prabhakar wrote:
> > > > Hi Sakari,
> > > >
> > > > On Thu, Oct 27, 2022 at 12:20 PM Sakari Ailus
> > > > <[email protected]> wrote:
> > > > >
> > > > > Hi Prabhakar,
> > > > >
> > > > > One more comment.
> > > > >
> > > > > On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > > > > > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> > > > > >
> > > > > > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> > > > > >
> > > > > > + pm_runtime_set_active(dev);
> > > > > > + pm_runtime_get_noresume(dev);
> > > > > > + pm_runtime_enable(dev);
> > > > >
> > > > > You won't gain anything by eanbling runtime PM here. Just move it to the
> > > > > end of the function before the rest of the calls. Error handling becomes
> > > > > more simple.
> > > > >
> > > > If I move the above calls below I get the below warning:
> > > >
> > > > [ 2.633386] ov5645 0-003c: Runtime PM usage count underflow!
> > > >
> > > > This is because of the last patch which moves ov5645_entity_init_cfg()
> > > > before registering the subdev. ov5645_entity_init_cfg() calls s_ctrl
> > > > due to which we are seeing the above message. Please let me know how
> > > > to proceed on this.
> > >
> > > Ah. Yes, this is a problem with the usage pattern of
> > > pm_runtime_get_if_in_use(). But please don't change that.
> > >
> > > You can still move enabling runtime PM later in the function.
> > >
> > Agreed, the final version looks like below:
> >
> > pm_runtime_set_active(dev);
> > pm_runtime_get_noresume(dev);
> >
>
> You'll have to enable runtime PM here, before pm_runtime_get_if_in_use()
> gets called.
>
> I'll see if it could be made to work in a sensible way when runtime PM
> isn't enabled yet.
There are various ways how runtime PM interface functions generally work,
and generally return an error when runtime PM is disabled. Incrementing the
usage_count when runtime PM is disabled would make
pm_runtime_get_if_in_use() very special and not match what the rest would
do. Therefore I think it's best to keep this in the driver. After all, mo
other driver needs this in the media tree, which is the major user of the
function.
--
Kind regards,
Sakari Ailus
Hi Sakari,
On Mon, Oct 31, 2022 at 2:25 PM Sakari Ailus
<[email protected]> wrote:
>
> Hi Prabhakar,
>
> On Thu, Oct 27, 2022 at 06:37:58PM +0000, Sakari Ailus wrote:
> > Hi Prabhakar,
> >
> > On Thu, Oct 27, 2022 at 05:32:07PM +0100, Lad, Prabhakar wrote:
> > > Hi Sakari,
> > >
> > > On Thu, Oct 27, 2022 at 1:47 PM Sakari Ailus
> > > <[email protected]> wrote:
> > > >
> > > > Hi Prabhakar,
> > > >
> > > > On Thu, Oct 27, 2022 at 01:01:52PM +0100, Lad, Prabhakar wrote:
> > > > > Hi Sakari,
> > > > >
> > > > > On Thu, Oct 27, 2022 at 12:20 PM Sakari Ailus
> > > > > <[email protected]> wrote:
> > > > > >
> > > > > > Hi Prabhakar,
> > > > > >
> > > > > > One more comment.
> > > > > >
> > > > > > On Fri, Oct 14, 2022 at 07:34:56PM +0100, Prabhakar wrote:
> > > > > > > @@ -1209,12 +1190,16 @@ static int ov5645_probe(struct i2c_client *client)
> > > > > > >
> > > > > > > dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
> > > > > > >
> > > > > > > + pm_runtime_set_active(dev);
> > > > > > > + pm_runtime_get_noresume(dev);
> > > > > > > + pm_runtime_enable(dev);
> > > > > >
> > > > > > You won't gain anything by eanbling runtime PM here. Just move it to the
> > > > > > end of the function before the rest of the calls. Error handling becomes
> > > > > > more simple.
> > > > > >
> > > > > If I move the above calls below I get the below warning:
> > > > >
> > > > > [ 2.633386] ov5645 0-003c: Runtime PM usage count underflow!
> > > > >
> > > > > This is because of the last patch which moves ov5645_entity_init_cfg()
> > > > > before registering the subdev. ov5645_entity_init_cfg() calls s_ctrl
> > > > > due to which we are seeing the above message. Please let me know how
> > > > > to proceed on this.
> > > >
> > > > Ah. Yes, this is a problem with the usage pattern of
> > > > pm_runtime_get_if_in_use(). But please don't change that.
> > > >
> > > > You can still move enabling runtime PM later in the function.
> > > >
> > > Agreed, the final version looks like below:
> > >
> > > pm_runtime_set_active(dev);
> > > pm_runtime_get_noresume(dev);
> > >
> >
> > You'll have to enable runtime PM here, before pm_runtime_get_if_in_use()
> > gets called.
> >
> > I'll see if it could be made to work in a sensible way when runtime PM
> > isn't enabled yet.
>
> There are various ways how runtime PM interface functions generally work,
> and generally return an error when runtime PM is disabled. Incrementing the
> usage_count when runtime PM is disabled would make
> pm_runtime_get_if_in_use() very special and not match what the rest would
> do. Therefore I think it's best to keep this in the driver. After all, mo
> other driver needs this in the media tree, which is the major user of the
> function.
>
Thank you for digging deep into this. I'll keep it as is and send a v3.
Cheers,
Prabhakar