linux-kernel - Re: [PATCH v2] arm: dts: Move am33xx and am43xx mmc nodes to sdhci-omap driver

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Date:   Wed, 27 May 2020 09:05:43 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Tomi Valkeinen <tomi.valkeinen@...com>
Cc:     Faiz Abbas <faiz_abbas@...com>, Keerthy <j-keerthy@...com>,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        bcousson@...libre.com
Subject: Re: [PATCH v2] arm: dts: Move am33xx and am43xx mmc nodes to
 sdhci-omap driver

* Tony Lindgren <tony@...mide.com> [200519 09:05]:
> * Tomi Valkeinen <tomi.valkeinen@...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.

To me it seems we may have some dss clock missing with the ti-sysc dts
changes that makes resume fail. Or else there is some ordering issue
between the dss components now on resume, I'll try to debug more.

Regards,

Tony