From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Marco Felsch <m.felsch@pengutronix.de>,
mchehab@kernel.org, robh+dt@kernel.org,
krzysztof.kozlowski+dt@linaro.org, kishon@ti.com,
vkoul@kernel.org, hverkuil@xs4all.nl, jacopo@jmondi.org,
kieran.bingham+renesas@ideasonboard.com,
linux-media@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org,
kernel@pengutronix.de
Subject: Re: [PATCH v2 4/4] media: tc358746: add Toshiba TC358746 Parallel to CSI-2 bridge driver
Date: Mon, 19 Sep 2022 13:03:27 +0000 [thread overview]
Message-ID: <Yyhonw7SEjkAPivN@paasikivi.fi.intel.com> (raw)
In-Reply-To: <YyhlQPhezmLG8ZCn@pendragon.ideasonboard.com>
On Mon, Sep 19, 2022 at 03:49:04PM +0300, Laurent Pinchart wrote:
> On Mon, Sep 19, 2022 at 12:39:35PM +0000, Sakari Ailus wrote:
> > > + dev_set_drvdata(dev, tc358746);
> > > + pm_runtime_set_autosuspend_delay(dev, 200);
> > > + pm_runtime_use_autosuspend(dev);
> > > + pm_runtime_enable(dev);
> > > +
> > > + err = tc358746_init_hw(tc358746);
> >
> > The driver depends on runtime PM being enabled but does not depend on
> > CONFIG_PM. I'd suggest to power the device on and only then enable runtime
> > PM. See
> > <URL:https://hverkuil.home.xs4all.nl/spec/driver-api/camera-sensor.html#power-management>.
>
> Or simply depend on CONFIG_PM :-)
The user can still disable runtime PM.
I guess few do though. This should be addressed separately from this
driver, it'd be good to be able to deny that. In fact, no-one has ever
probably tested this for a large number of drivers and I guess it exists
just to have a way to disable runtime PM support in drivers that do not
work with it...
--
Sakari Ailus
next prev parent reply other threads:[~2022-09-19 13:03 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-16 13:45 [PATCH v2 0/4] Add support for Toshiba TC358746 Marco Felsch
2022-09-16 13:45 ` [PATCH v2 1/4] phy: dphy: refactor get_default_config Marco Felsch
2022-09-16 13:45 ` [PATCH v2 2/4] phy: dphy: add support to calculate the timing based on hs_clk_rate Marco Felsch
2022-09-16 13:45 ` [PATCH v2 3/4] media: dt-bindings: add bindings for Toshiba TC358746 Marco Felsch
2022-09-17 23:06 ` Laurent Pinchart
2022-09-19 10:08 ` Marco Felsch
2022-09-19 10:23 ` Sakari Ailus
2022-09-19 10:55 ` Laurent Pinchart
2022-09-20 15:26 ` Marco Felsch
2022-09-20 17:32 ` Laurent Pinchart
2022-09-21 7:24 ` Krzysztof Kozlowski
2022-09-21 8:35 ` Marco Felsch
2022-09-21 8:59 ` Krzysztof Kozlowski
2022-09-22 11:01 ` Marco Felsch
2022-09-22 12:09 ` Krzysztof Kozlowski
2022-09-16 13:45 ` [PATCH v2 4/4] media: tc358746: add Toshiba TC358746 Parallel to CSI-2 bridge driver Marco Felsch
2022-09-17 1:28 ` kernel test robot
2022-09-19 12:39 ` Sakari Ailus
2022-09-19 12:49 ` Laurent Pinchart
2022-09-19 13:03 ` Sakari Ailus [this message]
2022-09-20 11:35 ` Marco Felsch
2022-09-19 12:46 ` Laurent Pinchart
2022-09-19 17:11 ` Marco Felsch
2022-09-19 17:37 ` Laurent Pinchart
2022-09-19 19:54 ` Sakari Ailus
2022-09-20 8:39 ` Marco Felsch
2022-09-20 8:53 ` Sakari Ailus
2022-09-20 10:48 ` Marco Felsch
2022-09-20 11:14 ` Laurent Pinchart
2022-09-20 11:53 ` Marco Felsch
2022-09-20 12:02 ` Dave Stevenson
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