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Date:   Wed, 31 Oct 2018 20:31:48 +0530
From:   Harini Katakam <>
To:     Andrew Lunn <>
Cc:     Harini Katakam <>,
        Nicolas Ferre <>,
        David Miller <>,
        Claudiu Beznea <>,,,
        Michal Simek <>,
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 <> 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 <>
> > Signed-off-by: Harini Katakam <>
> > ---
> > 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.


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