Hi Arnd,
On Thu, Oct 27, 2016 at 09:43:16AM +0200, Arnd Bergmann wrote:
> On Thursday, October 27, 2016 10:28:18 AM CEST Sakari Ailus wrote:
> >
> > On Wed, Oct 26, 2016 at 10:38:01PM +0200, Arnd Bergmann wrote:
> > > The rework of the PM support has caused two functions to
> > > be orphaned when CONFIG_PM is disabled:
> > >
> > > media/i2c/smiapp/smiapp-core.c:1352:12: error: 'smiapp_power_off' defined but not used [-Werror=unused-function]
> > > media/i2c/smiapp/smiapp-core.c:1206:12: error: 'smiapp_power_on' defined but not used [-Werror=unused-function]
> > >
> > > This changes all four PM entry points to __maybe_unused and
> > > removes the #ifdef markers for consistency. This avoids the
> > > warnings even when something changes again.
> > >
> > > Fixes: cbba45d43631 ("[media] smiapp: Use runtime PM")
> > > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> >
> > The power-on sequence is in fact mandatory as it involves writing the
> > initial configuration to the sensor as well.
> >
> > Instead, I believe the correct fix is to make the driver depend on
> > CONFIG_PM.
>
> (adding linux-pm list)
>
> That would be a rather unusual dependency, though it's possible that
> a lot of drivers in fact need it but never listed this explictly in
> Kconfig.
>
> What do other drivers do that need to have their runtime_resume
> function called at probe time when CONFIG_PM is disabled?
That's certainly possible as well.
V4L2 sub-device core operation s_power() no longer works (as it now uses
runtime PM) but I don't think that's an issue if PM is disabled anyway ---
we should really get rid of that in most drivers.
I can submit a patch.
--
Kind regards,
Sakari Ailus
e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx
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