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

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Message-ID: <YwMix1+Bm1jEbWqv@paasikivi.fi.intel.com>
Date:   Mon, 22 Aug 2022 06:31:35 +0000
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Marco Felsch <m.felsch@...gutronix.de>
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 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.

-- 
Sakari Ailus