netdev - Re: [PATCH] ravb: add wake-on-lan support via magic packet

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Message-ID: <45ae8c69-8420-eedd-7f97-ab78fe300949@cogentembedded.com>
Date:   Fri, 12 May 2017 15:06:59 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] ravb: add wake-on-lan support via magic packet

Hello!

On 05/12/2017 01:27 AM, Niklas Söderlund wrote:

> WoL is enabled in the suspend callback by setting MagicPacket detection
> and disabling all interrupts expect MagicPacket. In the resume path the

    Except.

> driver needs to reset the hardware to rearm the WoL logic, this prevents
> the driver from simply restoring the registers and to take advantage of
> that ravb was not suspended to reduce resume time. To reset the
> hardware the driver closes the device, sets it in reset mode and reopens
> the device just like it would do in a normal suspend/resume scenario
> without WoL enabled, but it both closes and opens the device in the
> resume callback since the device needs to be reset for WoL to work.
>
> One quirk needed for WoL is that the module clock needs to be prevented
> from being switched off by Runtime PM. To keep the clock alive the
> suspend callback need to call clk_enable() directly to increase the
> usage count of the clock. Then when Runtime PM decreases the clock usage
> count it won't reach 0 and be switched off.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
[...]

Acked-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

MBR, Sergei