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Date:   Tue, 19 May 2020 09:04:58 -0700
From:   Tony Lindgren <tony@atomide.com>
To:     Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc:     Faiz Abbas <faiz_abbas@ti.com>, Keerthy <j-keerthy@ti.com>,
        linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
        bcousson@baylibre.com
Subject: Re: [PATCH v2] arm: dts: Move am33xx and am43xx mmc nodes to
 sdhci-omap driver
Message-ID: <20200519160458.GU37466@atomide.com>
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* Tomi Valkeinen <tomi.valkeinen@ti.com> [200519 15:55]:
> (Dropping DT from cc)
> 
> On 19/05/2020 18:48, Tony Lindgren wrote:
> 
> > > > Suspend/resume on am43xx-gpevm is broken right now in mainline and the regression looks
> > > > like it is caused by the display subsystem. I have reported this to Tomi and
> > > > its being investigated.
> > > > 
> > > > Meanwhile I have tested this patch with display configs disabled and Keerthy's
> > > > suspend/resume tests pass on both am3 and am4.
> > 
> > OK great thanks for checking it. Do you have the display subsystem
> > related commit that broke PM? I'm wondering if my recent DSS platform
> > data removal changes might have caused the regression.
> 
> I spent a bit time looking at this, but unfortunately I wasn't even able to
> resume my AM4 evm from suspend. I tried with rtcwake and with plain console
> (with no_console_suspend). I did not have DSS loaded.

My test-bbb-suspend script seems to have:

sudo modprobe wkup_m3_ipc
sudo modprobe pm33xx
sudo modprobe rtc-omap
rtcwake -m mem -s 5

I think the same should work for am437x. But some boards do not support
deep sleep like am437x-idk.

> Anyone have quick hints on how to debug why resume doesn't seem to happen?

You might get some info with no_console_suspend, but that might also
cause other issues.

Regards,

Tony