@@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
+#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
@@ -883,8 +884,11 @@ static int ov7251_set_register_array(struct ov7251 *ov7251,
return 0;
}
-static int ov7251_set_power_on(struct ov7251 *ov7251)
+static int ov7251_set_power_on(struct device *dev)
{
+ struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct ov7251 *ov7251 = to_ov7251(sd);
int ret;
u32 wait_us;
@@ -909,11 +913,17 @@ static int ov7251_set_power_on(struct ov7251 *ov7251)
return 0;
}
-static void ov7251_set_power_off(struct ov7251 *ov7251)
+static int ov7251_set_power_off(struct device *dev)
{
+ struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct ov7251 *ov7251 = to_ov7251(sd);
+
clk_disable_unprepare(ov7251->xclk);
gpiod_set_value_cansleep(ov7251->enable_gpio, 0);
ov7251_regulators_disable(ov7251);
+
+ return 0;
}
static int ov7251_s_power(struct v4l2_subdev *sd, int on)
@@ -928,7 +938,7 @@ static int ov7251_s_power(struct v4l2_subdev *sd, int on)
goto exit;
if (on) {
- ret = ov7251_set_power_on(ov7251);
+ ret = ov7251_set_power_on(ov7251->dev);
if (ret < 0)
goto exit;
@@ -937,13 +947,13 @@ static int ov7251_s_power(struct v4l2_subdev *sd, int on)
ARRAY_SIZE(ov7251_global_init_setting));
if (ret < 0) {
dev_err(ov7251->dev, "could not set init registers\n");
- ov7251_set_power_off(ov7251);
+ ov7251_set_power_off(ov7251->dev);
goto exit;
}
ov7251->power_on = true;
} else {
- ov7251_set_power_off(ov7251);
+ ov7251_set_power_off(ov7251->dev);
ov7251->power_on = false;
}
@@ -1017,7 +1027,7 @@ static int ov7251_s_ctrl(struct v4l2_ctrl *ctrl)
/* v4l2_ctrl_lock() locks our mutex */
- if (!ov7251->power_on)
+ if (!pm_runtime_get_if_in_use(ov7251->dev))
return 0;
switch (ctrl->id) {
@@ -1041,6 +1051,8 @@ static int ov7251_s_ctrl(struct v4l2_ctrl *ctrl)
break;
}
+ pm_runtime_put(ov7251->dev);
+
return ret;
}
@@ -1283,10 +1295,15 @@ static int ov7251_s_stream(struct v4l2_subdev *subdev, int enable)
mutex_lock(&ov7251->lock);
if (enable) {
+ ret = pm_runtime_get_sync(ov7251->dev);
+ if (ret < 0)
+ goto unlock_out;
+
ret = ov7251_pll_configure(ov7251);
- if (ret)
- return dev_err_probe(ov7251->dev, ret,
- "error configuring PLLs\n");
+ if (ret) {
+ dev_err(ov7251->dev, "error configuring PLLs\n");
+ goto err_power_down;
+ }
ret = ov7251_set_register_array(ov7251,
ov7251->current_mode->data,
@@ -1295,23 +1312,29 @@ static int ov7251_s_stream(struct v4l2_subdev *subdev, int enable)
dev_err(ov7251->dev, "could not set mode %dx%d\n",
ov7251->current_mode->width,
ov7251->current_mode->height);
- goto exit;
+ goto err_power_down;
}
ret = __v4l2_ctrl_handler_setup(&ov7251->ctrls);
if (ret < 0) {
dev_err(ov7251->dev, "could not sync v4l2 controls\n");
- goto exit;
+ goto err_power_down;
}
ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
OV7251_SC_MODE_SELECT_STREAMING);
+ if (ret)
+ goto err_power_down;
} else {
ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
OV7251_SC_MODE_SELECT_SW_STANDBY);
+ pm_runtime_put(ov7251->dev);
}
-exit:
+unlock_out:
mutex_unlock(&ov7251->lock);
+ return ret;
+err_power_down:
+ pm_runtime_put_noidle(ov7251->dev);
return ret;
}
@@ -1612,23 +1635,24 @@ static int ov7251_probe(struct i2c_client *client)
goto free_ctrl;
}
- ret = ov7251_s_power(&ov7251->sd, true);
- if (ret < 0) {
- dev_err(dev, "could not power up OV7251\n");
+ ret = ov7251_set_power_on(ov7251->dev);
+ if (ret)
goto free_entity;
- }
ret = ov7251_detect_chip(ov7251);
if (ret)
goto power_down;
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_get_noresume(&client->dev);
+ pm_runtime_enable(&client->dev);
ret = ov7251_read_reg(ov7251, OV7251_PRE_ISP_00,
&ov7251->pre_isp_00);
if (ret < 0) {
dev_err(dev, "could not read test pattern value\n");
ret = -ENODEV;
- goto power_down;
+ goto err_pm_runtime;
}
ret = ov7251_read_reg(ov7251, OV7251_TIMING_FORMAT1,
@@ -1636,7 +1660,7 @@ static int ov7251_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 = ov7251_read_reg(ov7251, OV7251_TIMING_FORMAT2,
@@ -1644,10 +1668,12 @@ static int ov7251_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;
}
- ov7251_s_power(&ov7251->sd, false);
+ pm_runtime_set_autosuspend_delay(&client->dev, 1000);
+ pm_runtime_use_autosuspend(&client->dev);
+ pm_runtime_put_autosuspend(&client->dev);
ret = v4l2_async_register_subdev(&ov7251->sd);
if (ret < 0) {
@@ -1659,8 +1685,11 @@ static int ov7251_probe(struct i2c_client *client)
return 0;
+err_pm_runtime:
+ pm_runtime_disable(ov7251->dev);
+ pm_runtime_put_noidle(ov7251->dev);
power_down:
- ov7251_s_power(&ov7251->sd, false);
+ ov7251_set_power_off(ov7251->dev);
free_entity:
media_entity_cleanup(&ov7251->sd.entity);
free_ctrl:
@@ -1680,9 +1709,18 @@ static int ov7251_remove(struct i2c_client *client)
v4l2_ctrl_handler_free(&ov7251->ctrls);
mutex_destroy(&ov7251->lock);
+ pm_runtime_disable(ov7251->dev);
+ if (!pm_runtime_status_suspended(ov7251->dev))
+ ov7251_set_power_off(ov7251->dev);
+ pm_runtime_set_suspended(ov7251->dev);
+
return 0;
}
+static const struct dev_pm_ops ov7251_pm_ops = {
+ SET_RUNTIME_PM_OPS(ov7251_set_power_off, ov7251_set_power_on, NULL)
+};
+
static const struct of_device_id ov7251_of_match[] = {
{ .compatible = "ovti,ov7251" },
{ /* sentinel */ }
@@ -1700,6 +1738,7 @@ static struct i2c_driver ov7251_i2c_driver = {
.of_match_table = ov7251_of_match,
.acpi_match_table = ov7251_acpi_match,
.name = "ov7251",
+ .pm = &ov7251_pm_ops,
},
.probe_new = ov7251_probe,
.remove = ov7251_remove,
Add pm_runtime support to the ov7251 driver. Signed-off-by: Daniel Scally <djrscally@gmail.com> --- Changes in v4: - None Changes in v3: - None Changes in v2: - Switched ov7251_set_power_[on|off]() to take a struct device * as the input parameter and used those functions for pm_runtime instead of adding wrappers (Sakari) drivers/media/i2c/ov7251.c | 81 ++++++++++++++++++++++++++++---------- 1 file changed, 60 insertions(+), 21 deletions(-)