diff options
| author | Hans Verkuil <hverkuil@xs4all.nl> | 2018-02-21 02:49:25 -0500 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-03-21 12:05:39 -0400 |
| commit | 3aab15af9ad8fa8dc0399cb4b679d7cb85c20a56 (patch) | |
| tree | acd07cf67ae4ab9c752774d71a55489974359974 /drivers/media/pci/cx23885 | |
| parent | 3f97df91a189ac84711467a687bef69dfd88b53c (diff) | |
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>
Diffstat (limited to 'drivers/media/pci/cx23885')
| -rw-r--r-- | drivers/media/pci/cx23885/cx23885-core.c | 2 | ||||
| -rw-r--r-- | drivers/media/pci/cx23885/cx23885-dvb.c | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/drivers/media/pci/cx23885/cx23885-core.c b/drivers/media/pci/cx23885/cx23885-core.c index ff369e90b848..019fac49db5b 100644 --- a/drivers/media/pci/cx23885/cx23885-core.c +++ b/drivers/media/pci/cx23885/cx23885-core.c @@ -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) { diff --git a/drivers/media/pci/cx23885/cx23885-dvb.c b/drivers/media/pci/cx23885/cx23885-dvb.c index 7bb1febb1cb2..114d9bcbe4f4 100644 --- a/drivers/media/pci/cx23885/cx23885-dvb.c +++ b/drivers/media/pci/cx23885/cx23885-dvb.c @@ -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); |