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| author | Hans Verkuil <hverkuil@xs4all.nl> | 2018-02-21 08:49:25 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-03-21 17:05:39 +0100 |
| commit | 3aab15af9ad8fa8dc0399cb4b679d7cb85c20a56 (patch) | |
| tree | acd07cf67ae4ab9c752774d71a55489974359974 /drivers/media/pci/cx88 | |
| parent | media: vb2-core: vb2_ops: document non-interrupt-context calling (diff) | |
| download | linux-3aab15af9ad8fa8dc0399cb4b679d7cb85c20a56.tar.xz linux-3aab15af9ad8fa8dc0399cb4b679d7cb85c20a56.zip | |
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/cx88')
| -rw-r--r-- | drivers/media/pci/cx88/cx88-cards.c | 2 | ||||
| -rw-r--r-- | drivers/media/pci/cx88/cx88-dvb.c | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/drivers/media/pci/cx88/cx88-cards.c b/drivers/media/pci/cx88/cx88-cards.c index 6df21b29ea17..4c92d2388c26 100644 --- a/drivers/media/pci/cx88/cx88-cards.c +++ b/drivers/media/pci/cx88/cx88-cards.c @@ -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); } /* ------------------------------------------------------------------ */ diff --git a/drivers/media/pci/cx88/cx88-dvb.c b/drivers/media/pci/cx88/cx88-dvb.c index ec65eca713f9..2f886140dd2e 100644 --- a/drivers/media/pci/cx88/cx88-dvb.c +++ b/drivers/media/pci/cx88/cx88-dvb.c @@ -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, |