linux-kernel - Re: [PATCH 3/4] media: mt9m111: fix device power usage

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Message-ID: <20220823144450.ctjmby53prjw5qis@pengutronix.de>
Date:   Tue, 23 Aug 2022 16:44:50 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     mchehab@...nel.org, laurent.pinchart+renesas@...asonboard.com,
        jacopo+renesas@...ndi.org, akinobu.mita@...il.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: Re: [PATCH 3/4] media: mt9m111: fix device power usage

Hi Sakari,

On 22-08-22, Sakari Ailus wrote:
> On Mon, Aug 22, 2022 at 09:54:26AM +0200, Marco Felsch wrote:
> > Hi Sakari,
> > 
> > On 22-08-22, Sakari Ailus wrote:
> > > Hi Marco,
> > > 
> > > On Thu, Aug 18, 2022 at 04:47:11PM +0200, Marco Felsch wrote:
> > > > Currently the driver turn off the power after probe and toggle it during
> > > > .stream by using the .s_power callback. This is problematic since other
> > > > callbacks like .set_fmt accessing the hardware as well which will fail.
> > > > So in the end the default format is the only supported format.
> > > 
> > > It'd be much better to add runtime PM support to the driver instead.
> > 
> > I got your point, but didn't have the time for it right now, I will drop
> > the patch from my v2.
> 
> The API is different but generally involves doing more or less the same
> what this and the 4th patch do together.

I know :) as soon as I got feedback on my TC35 series [1] I give it a
try and change it to dev-pm.

[1] https://lore.kernel.org/linux-media/20220818143307.967150-1-m.felsch@pengutronix.de/T/#t

Regards,
  Marco


> 
> -- 
> Sakari Ailus
>