linux-kernel - Re: [PATCH 4/4] net: macb: Add support for suspend/resume with full power down

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Message-ID: <CAFcVECLQ64oHwz6E4wPRC4LyNh-c1Z-Nw9GyKAm+h1_FsvjQvg@mail.gmail.com>
Date:   Wed, 31 Oct 2018 20:31:48 +0530
From:   Harini Katakam <harinik@...inx.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Harini Katakam <harini.katakam@...inx.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        David Miller <davem@...emloft.net>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michal Simek <michal.simek@...inx.com>, appanad@...inx.com
Subject: Re: [PATCH 4/4] net: macb: Add support for suspend/resume with full
 power down

Hi Andrew,
On Wed, Oct 31, 2018 at 8:28 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Wed, Oct 31, 2018 at 09:10:23AM +0530, Harini Katakam wrote:
> > When macb device is suspended and system is powered down, the clocks
> > are removed and hence macb should be closed gracefully and restored
> > upon resume. This patch does the same by switching off the net device,
> > suspending phy and performing necessary cleanup of interrupts and BDs.
> > Upon resume, all these are reinitialized again.
> >
> > Reset of macb device is done only when GEM is not a wake device.
> > Even when gem is a wake device, tx queues can be stopped and ptp device
> > can be closed (tsu clock will be disabled in pm_runtime_suspend) as
> > wake event detection has no dependency on this.
> >
> > Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> > Signed-off-by: Harini Katakam <harini.katakam@...inx.com>
> > ---
> > Notes:
> > I was unable to do a full macb_close/open in this patch as suggested
> > because it was freeing and allocating the full RX/TX buffers and
> > this time consuming, also leading to a crash when done continuously
> > in stress tests.
>
> Hi Harini
>
> Did you try stress testing just plain up/down, which will call
> macb_open/macb_close? It could be it is broken already, and
> suspend/resume just makes it more obvious it is broken.

Yes, I did. Plain up/down stress tests do not show any problems.

Regards,
Harini