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authorAkinobu Mita <akinobu.mita@gmail.com>2018-11-22 19:13:56 +0300
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2018-12-07 16:33:00 +0300
commit69d2a734c5dc7085365e752a7e8e35999c7a6c20 (patch)
treeb16fda26d9dc66d914a5641265034f3d6431fbd6 /drivers/media
parente0fe5c7b22a8d4629ed85b668a93ff2582b93203 (diff)
downloadlinux-69d2a734c5dc7085365e752a7e8e35999c7a6c20.tar.xz
media: video-i2c: support runtime PM
AMG88xx has a register for setting operating mode. This adds support runtime PM by changing the operating mode. The instruction for changing sleep mode to normal mode is from the reference specifications. https://docid81hrs3j1.cloudfront.net/medialibrary/2017/11/PANA-S-A0002141979-1.pdf Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/i2c/video-i2c.c141
1 files changed, 139 insertions, 2 deletions
diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
index 8f1aea281715..b6ebb8d53e90 100644
--- a/drivers/media/i2c/video-i2c.c
+++ b/drivers/media/i2c/video-i2c.c
@@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -94,10 +95,23 @@ struct video_i2c_chip {
/* xfer function */
int (*xfer)(struct video_i2c_data *data, char *buf);
+ /* power control function */
+ int (*set_power)(struct video_i2c_data *data, bool on);
+
/* hwmon init function */
int (*hwmon_init)(struct video_i2c_data *data);
};
+/* Power control register */
+#define AMG88XX_REG_PCTL 0x00
+#define AMG88XX_PCTL_NORMAL 0x00
+#define AMG88XX_PCTL_SLEEP 0x10
+
+/* Reset register */
+#define AMG88XX_REG_RST 0x01
+#define AMG88XX_RST_FLAG 0x30
+#define AMG88XX_RST_INIT 0x3f
+
/* Frame rate register */
#define AMG88XX_REG_FPSC 0x02
#define AMG88XX_FPSC_1FPS BIT(0)
@@ -127,6 +141,59 @@ static int amg88xx_setup(struct video_i2c_data *data)
return regmap_update_bits(data->regmap, AMG88XX_REG_FPSC, mask, val);
}
+static int amg88xx_set_power_on(struct video_i2c_data *data)
+{
+ int ret;
+
+ ret = regmap_write(data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_NORMAL);
+ if (ret)
+ return ret;
+
+ msleep(50);
+
+ ret = regmap_write(data->regmap, AMG88XX_REG_RST, AMG88XX_RST_INIT);
+ if (ret)
+ return ret;
+
+ usleep_range(2000, 3000);
+
+ ret = regmap_write(data->regmap, AMG88XX_REG_RST, AMG88XX_RST_FLAG);
+ if (ret)
+ return ret;
+
+ /*
+ * Wait two frames before reading thermistor and temperature registers
+ */
+ msleep(200);
+
+ return 0;
+}
+
+static int amg88xx_set_power_off(struct video_i2c_data *data)
+{
+ int ret;
+
+ ret = regmap_write(data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_SLEEP);
+ if (ret)
+ return ret;
+ /*
+ * Wait for a while to avoid resuming normal mode immediately after
+ * entering sleep mode, otherwise the device occasionally goes wrong
+ * (thermistor and temperature registers are not updated at all)
+ */
+ msleep(100);
+
+ return 0;
+}
+
+static int amg88xx_set_power(struct video_i2c_data *data, bool on)
+{
+ if (on)
+ return amg88xx_set_power_on(data);
+
+ return amg88xx_set_power_off(data);
+}
+
#if IS_ENABLED(CONFIG_HWMON)
static const u32 amg88xx_temp_config[] = {
@@ -158,7 +225,15 @@ static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type,
__le16 buf;
int tmp;
+ tmp = pm_runtime_get_sync(regmap_get_device(data->regmap));
+ if (tmp < 0) {
+ pm_runtime_put_noidle(regmap_get_device(data->regmap));
+ return tmp;
+ }
+
tmp = regmap_bulk_read(data->regmap, AMG88XX_REG_TTHL, &buf, 2);
+ pm_runtime_mark_last_busy(regmap_get_device(data->regmap));
+ pm_runtime_put_autosuspend(regmap_get_device(data->regmap));
if (tmp)
return tmp;
@@ -217,6 +292,7 @@ static const struct video_i2c_chip video_i2c_chip[] = {
.regmap_config = &amg88xx_regmap_config,
.setup = &amg88xx_setup,
.xfer = &amg88xx_xfer,
+ .set_power = amg88xx_set_power,
.hwmon_init = amg88xx_hwmon_init,
},
};
@@ -343,14 +419,21 @@ static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state
static int start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct video_i2c_data *data = vb2_get_drv_priv(vq);
+ struct device *dev = regmap_get_device(data->regmap);
int ret;
if (data->kthread_vid_cap)
return 0;
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ goto error_del_list;
+ }
+
ret = data->chip->setup(data);
if (ret)
- goto error_del_list;
+ goto error_rpm_put;
data->sequence = 0;
data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data,
@@ -359,6 +442,9 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
if (!ret)
return 0;
+error_rpm_put:
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
error_del_list:
video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED);
@@ -374,6 +460,8 @@ static void stop_streaming(struct vb2_queue *vq)
kthread_stop(data->kthread_vid_cap);
data->kthread_vid_cap = NULL;
+ pm_runtime_mark_last_busy(regmap_get_device(data->regmap));
+ pm_runtime_put_autosuspend(regmap_get_device(data->regmap));
video_i2c_del_list(vq, VB2_BUF_STATE_ERROR);
}
@@ -648,6 +736,16 @@ static int video_i2c_probe(struct i2c_client *client,
video_set_drvdata(&data->vdev, data);
i2c_set_clientdata(client, data);
+ ret = data->chip->set_power(data, true);
+ if (ret)
+ goto error_unregister_device;
+
+ pm_runtime_get_noresume(&client->dev);
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_enable(&client->dev);
+ pm_runtime_set_autosuspend_delay(&client->dev, 2000);
+ pm_runtime_use_autosuspend(&client->dev);
+
if (data->chip->hwmon_init) {
ret = data->chip->hwmon_init(data);
if (ret < 0) {
@@ -658,10 +756,19 @@ static int video_i2c_probe(struct i2c_client *client,
ret = video_register_device(&data->vdev, VFL_TYPE_GRABBER, -1);
if (ret < 0)
- goto error_unregister_device;
+ goto error_pm_disable;
+
+ pm_runtime_mark_last_busy(&client->dev);
+ pm_runtime_put_autosuspend(&client->dev);
return 0;
+error_pm_disable:
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+ pm_runtime_put_noidle(&client->dev);
+ data->chip->set_power(data, false);
+
error_unregister_device:
v4l2_device_unregister(v4l2_dev);
mutex_destroy(&data->lock);
@@ -680,11 +787,40 @@ static int video_i2c_remove(struct i2c_client *client)
{
struct video_i2c_data *data = i2c_get_clientdata(client);
+ pm_runtime_get_sync(&client->dev);
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+ pm_runtime_put_noidle(&client->dev);
+ data->chip->set_power(data, false);
+
video_unregister_device(&data->vdev);
return 0;
}
+#ifdef CONFIG_PM
+
+static int video_i2c_pm_runtime_suspend(struct device *dev)
+{
+ struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));
+
+ return data->chip->set_power(data, false);
+}
+
+static int video_i2c_pm_runtime_resume(struct device *dev)
+{
+ struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));
+
+ return data->chip->set_power(data, true);
+}
+
+#endif
+
+static const struct dev_pm_ops video_i2c_pm_ops = {
+ SET_RUNTIME_PM_OPS(video_i2c_pm_runtime_suspend,
+ video_i2c_pm_runtime_resume, NULL)
+};
+
static const struct i2c_device_id video_i2c_id_table[] = {
{ "amg88xx", AMG88XX },
{}
@@ -701,6 +837,7 @@ static struct i2c_driver video_i2c_driver = {
.driver = {
.name = VIDEO_I2C_DRIVER,
.of_match_table = video_i2c_of_match,
+ .pm = &video_i2c_pm_ops,
},
.probe = video_i2c_probe,
.remove = video_i2c_remove,