linux-kernel - Re: [PATCH v3] drivers: base: add support to skip power management in device/driver model

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Message-ID: <20190214200937.GA21536@vmlxhi-102.adit-jv.com>
Date:   Thu, 14 Feb 2019 21:09:37 +0100
From:   Eugeniu Rosca <erosca@...adit-jv.com>
To:     Sudeep Holla <sudeep.holla@....com>
CC:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jisheng Zhang <jszhang@...vell.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Joshua Frkuska <joshua_frkuska@...tor.com>,
        Eugeniu Rosca <roscaeugeniu@...il.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v3] drivers: base: add support to skip power management
 in device/driver model

Hello Sudeep,

On Thu, Feb 14, 2019 at 06:29:10PM +0000, Sudeep Holla wrote:
[..]
> 
> Lets add no_pm_required flags to indicate that the device doesn't

s/no_pm_required/no_pm/ ?

> require any sort of pm activities and all of them can be completely
> skipped. We can use the same flag to also avoid adding not used *power*
> sysfs entries for these devices. For now, lets use this for cpu cache
> devices.
[..]

Running suspend/resume ~500 times on H3-Salvator-X with this patch
didn't reveal any regressions. The annoying warnings are gone.
Console log and .config are available at:
https://gist.github.com/erosca/1af11aa62e16903e1b6964be6a9eea77

Tested-by: Eugeniu Rosca <erosca@...adit-jv.com>

Thanks!
Eugeniu.