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

From: Andrew Lunn
Date: Wed Oct 31 2018 - 10:58:08 EST

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@xxxxxxxxxx>
> Signed-off-by: Harini Katakam <harini.katakam@xxxxxxxxxx>
> ---
> 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.