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media: add tuner standby op, use where needed 

The v4l2_subdev core s_power op was used for two different things: power on/off
sensors or video decoders/encoders and to put a tuner in standby (and only the
tuner!). There is no 'tuner wakeup' op, that's done automatically when the tuner
is accessed.

The danger with calling (s_power, 0) to put a tuner into standby is that it is
usually broadcast for all subdevs. So a video receiver subdev that supports
s_power will also be powered off, and since there is no corresponding (s_power, 1)
they will never be powered on again.

In addition, this is specifically meant for tuners only since they draw the most
current.

This patch adds a new tuner op called 'standby' and replaces all calls to
(core, s_power, 0) by (tuner, standby). This prevents confusion between the two
uses of s_power. Note that there is no overlap: bridge drivers either just want
to put the tuner into standby, or they deal with powering on/off sensors. Never
both.

This also makes it easier to replace s_power for the remaining bridge drivers
with some PM code later.

Whether we want something cleaner for tuners in the future is a separate topic.
There is a lot of legacy code surrounding tuners, and I am very hesitant about
making changes there.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2018-02-21 02:49:25 -05:00 committed by Mauro Carvalho Chehab
parent 3f97df91a1
commit 3aab15af9a
13 changed files with 28 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/media/pci/cx23885/cx23885-core.c
View File

@ -983,7 +983,7 @@ static int cx23885_dev_setup(struct cx23885_dev *dev)
cx23885_i2c_register(&dev->i2c_bus[1]);
cx23885_i2c_register(&dev->i2c_bus[2]);
cx23885_card_setup(dev);
call_all(dev, core, s_power, 0);
call_all(dev, tuner, standby);
cx23885_ir_init(dev);
if (dev->board == CX23885_BOARD_VIEWCAST_460E) {

4
drivers/media/pci/cx23885/cx23885-dvb.c
View File

@ -2568,8 +2568,8 @@ static int dvb_register(struct cx23885_tsport *port)
fe1->dvb.frontend->ops.ts_bus_ctrl = cx23885_dvb_bus_ctrl;
#endif
/* Put the analog decoder in standby to keep it quiet */
call_all(dev, core, s_power, 0);
/* Put the tuner in standby to keep it quiet */
call_all(dev, tuner, standby);
if (fe0->dvb.frontend->ops.analog_ops.standby)
fe0->dvb.frontend->ops.analog_ops.standby(fe0->dvb.frontend);

2
drivers/media/pci/cx88/cx88-cards.c
View File

@ -3592,7 +3592,7 @@ static void cx88_card_setup(struct cx88_core *core)
ctl.fname);
call_all(core, tuner, s_config, &xc2028_cfg);
}
call_all(core, core, s_power, 0);
call_all(core, tuner, standby);
}
/* ------------------------------------------------------------------ */

4
drivers/media/pci/cx88/cx88-dvb.c
View File

@ -1631,8 +1631,8 @@ static int dvb_register(struct cx8802_dev *dev)
if (fe1)
fe1->dvb.frontend->ops.ts_bus_ctrl = cx88_dvb_bus_ctrl;
/* Put the analog decoder in standby to keep it quiet */
call_all(core, core, s_power, 0);
/* Put the tuner in standby to keep it quiet */
call_all(core, tuner, standby);
/* register everything */
res = vb2_dvb_register_bus(&dev->frontends, THIS_MODULE, dev,

2
drivers/media/pci/saa7134/saa7134-video.c
View File

@ -1200,7 +1200,7 @@ static int video_release(struct file *file)
saa_andorb(SAA7134_OFMT_DATA_A, 0x1f, 0);
saa_andorb(SAA7134_OFMT_DATA_B, 0x1f, 0);
saa_call_all(dev, core, s_power, 0);
saa_call_all(dev, tuner, standby);
if (vdev->vfl_type == VFL_TYPE_RADIO)
saa_call_all(dev, core, ioctl, SAA6588_CMD_CLOSE, &cmd);
mutex_unlock(&dev->lock);

16
drivers/media/tuners/e4000.c
View File

@ -293,28 +293,18 @@ static inline struct e4000_dev *e4000_subdev_to_dev(struct v4l2_subdev *sd)
return container_of(sd, struct e4000_dev, sd);
}
static int e4000_s_power(struct v4l2_subdev *sd, int on)
static int e4000_standby(struct v4l2_subdev *sd)
{
struct e4000_dev *dev = e4000_subdev_to_dev(sd);
struct i2c_client *client = dev->client;
int ret;
dev_dbg(&client->dev, "on=%d\n", on);
if (on)
ret = e4000_init(dev);
else
ret = e4000_sleep(dev);
ret = e4000_sleep(dev);
if (ret)
return ret;
return e4000_set_params(dev);
}
static const struct v4l2_subdev_core_ops e4000_subdev_core_ops = {
.s_power = e4000_s_power,
};
static int e4000_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
{
struct e4000_dev *dev = e4000_subdev_to_dev(sd);
@ -382,6 +372,7 @@ static int e4000_enum_freq_bands(struct v4l2_subdev *sd,
}
static const struct v4l2_subdev_tuner_ops e4000_subdev_tuner_ops = {
.standby = e4000_standby,
.g_tuner = e4000_g_tuner,
.s_tuner = e4000_s_tuner,
.g_frequency = e4000_g_frequency,
@ -390,7 +381,6 @@ static const struct v4l2_subdev_tuner_ops e4000_subdev_tuner_ops = {
};
static const struct v4l2_subdev_ops e4000_subdev_ops = {
.core = &e4000_subdev_core_ops,
.tuner = &e4000_subdev_tuner_ops,
};

16
drivers/media/tuners/fc2580.c
View File

@ -386,28 +386,18 @@ static inline struct fc2580_dev *fc2580_subdev_to_dev(struct v4l2_subdev *sd)
return container_of(sd, struct fc2580_dev, subdev);
}
static int fc2580_s_power(struct v4l2_subdev *sd, int on)
static int fc2580_standby(struct v4l2_subdev *sd)
{
struct fc2580_dev *dev = fc2580_subdev_to_dev(sd);
struct i2c_client *client = dev->client;
int ret;
dev_dbg(&client->dev, "on=%d\n", on);
if (on)
ret = fc2580_init(dev);
else
ret = fc2580_sleep(dev);
ret = fc2580_sleep(dev);
if (ret)
return ret;
return fc2580_set_params(dev);
}
static const struct v4l2_subdev_core_ops fc2580_subdev_core_ops = {
.s_power = fc2580_s_power,
};
static int fc2580_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
{
struct fc2580_dev *dev = fc2580_subdev_to_dev(sd);
@ -475,6 +465,7 @@ static int fc2580_enum_freq_bands(struct v4l2_subdev *sd,
}
static const struct v4l2_subdev_tuner_ops fc2580_subdev_tuner_ops = {
.standby = fc2580_standby,
.g_tuner = fc2580_g_tuner,
.s_tuner = fc2580_s_tuner,
.g_frequency = fc2580_g_frequency,
@ -483,7 +474,6 @@ static const struct v4l2_subdev_tuner_ops fc2580_subdev_tuner_ops = {
};
static const struct v4l2_subdev_ops fc2580_subdev_ops = {
.core = &fc2580_subdev_core_ops,
.tuner = &fc2580_subdev_tuner_ops,
};

19
drivers/media/tuners/msi001.c
View File

@ -291,26 +291,13 @@ err:
return ret;
}
static int msi001_s_power(struct v4l2_subdev *sd, int on)
static int msi001_standby(struct v4l2_subdev *sd)
{
struct msi001_dev *dev = sd_to_msi001_dev(sd);
struct spi_device *spi = dev->spi;
int ret;
dev_dbg(&spi->dev, "on=%d\n", on);
if (on)
ret = 0;
else
ret = msi001_wreg(dev, 0x000000);
return ret;
return msi001_wreg(dev, 0x000000);
}
static const struct v4l2_subdev_core_ops msi001_core_ops = {
.s_power = msi001_s_power,
};
static int msi001_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
{
struct msi001_dev *dev = sd_to_msi001_dev(sd);
@ -386,6 +373,7 @@ static int msi001_enum_freq_bands(struct v4l2_subdev *sd,
}
static const struct v4l2_subdev_tuner_ops msi001_tuner_ops = {
.standby = msi001_standby,
.g_tuner = msi001_g_tuner,
.s_tuner = msi001_s_tuner,
.g_frequency = msi001_g_frequency,
@ -394,7 +382,6 @@ static const struct v4l2_subdev_tuner_ops msi001_tuner_ops = {
};
static const struct v4l2_subdev_ops msi001_ops = {
.core = &msi001_core_ops,
.tuner = &msi001_tuner_ops,
};

4
drivers/media/usb/au0828/au0828-video.c
View File

@ -1091,8 +1091,8 @@ static int au0828_v4l2_close(struct file *filp)
*/
ret = v4l_enable_media_source(vdev);
if (ret == 0)
v4l2_device_call_all(&dev->v4l2_dev, 0, core,
s_power, 0);
v4l2_device_call_all(&dev->v4l2_dev, 0, tuner,
standby);
dev->std_set_in_tuner_core = 0;
/* When close the device, set the usb intf0 into alt0 to free

2
drivers/media/usb/cx231xx/cx231xx-video.c
View File

@ -1941,7 +1941,7 @@ static int cx231xx_close(struct file *filp)
}
/* Save some power by putting tuner to sleep */
call_all(dev, core, s_power, 0);
call_all(dev, tuner, standby);
/* do this before setting alternate! */
if (dev->USE_ISO)

4
drivers/media/usb/em28xx/em28xx-video.c
View File

@ -2257,7 +2257,7 @@ static int em28xx_v4l2_close(struct file *filp)
goto exit;
/* Save some power by putting tuner to sleep */
v4l2_device_call_all(&v4l2->v4l2_dev, 0, core, s_power, 0);
v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
/* do this before setting alternate! */
em28xx_set_mode(dev, EM28XX_SUSPEND);
@ -2810,7 +2810,7 @@ static int em28xx_v4l2_init(struct em28xx *dev)
video_device_node_name(&v4l2->vbi_dev));
/* Save some power by putting tuner to sleep */
v4l2_device_call_all(&v4l2->v4l2_dev, 0, core, s_power, 0);
v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
/* initialize videobuf2 stuff */
em28xx_vb2_setup(dev);

15
drivers/media/v4l2-core/tuner-core.c
View File

@ -1099,23 +1099,14 @@ static int tuner_s_radio(struct v4l2_subdev *sd)
*/
/**
* tuner_s_power - controls the power state of the tuner
* tuner_standby - places the tuner in standby mode
* @sd: pointer to struct v4l2_subdev
* @on: a zero value puts the tuner to sleep, non-zero wakes it up
*/
static int tuner_s_power(struct v4l2_subdev *sd, int on)
static int tuner_standby(struct v4l2_subdev *sd)
{
struct tuner *t = to_tuner(sd);
struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
if (on) {
if (t->standby && set_mode(t, t->mode) == 0) {
dprintk("Waking up tuner\n");
set_freq(t, 0);
}
return 0;
}
dprintk("Putting tuner to sleep\n");
t->standby = true;
if (analog_ops->standby)
@ -1328,10 +1319,10 @@ static int tuner_command(struct i2c_client *client, unsigned cmd, void *arg)
static const struct v4l2_subdev_core_ops tuner_core_ops = {
.log_status = tuner_log_status,
.s_power = tuner_s_power,
};
static const struct v4l2_subdev_tuner_ops tuner_tuner_ops = {
.standby = tuner_standby,
.s_radio = tuner_s_radio,
.g_tuner = tuner_g_tuner,
.s_tuner = tuner_s_tuner,

4
include/media/v4l2-subdev.h
View File

@ -224,6 +224,9 @@ struct v4l2_subdev_core_ops {
* struct v4l2_subdev_tuner_ops - Callbacks used when v4l device was opened
* in radio mode.
*
* @standby: puts the tuner in standby mode. It will be woken up
* automatically the next time it is used.
*
* @s_radio: callback that switches the tuner to radio mode.
* drivers should explicitly call it when a tuner ops should
* operate on radio mode, before being able to handle it.
@ -268,6 +271,7 @@ struct v4l2_subdev_core_ops {
* }
*/
struct v4l2_subdev_tuner_ops {
int (*standby)(struct v4l2_subdev *sd);
int (*s_radio)(struct v4l2_subdev *sd);
int (*s_frequency)(struct v4l2_subdev *sd, const struct v4l2_frequency *freq);
int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);