Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 27 May 2020 09:05:43 -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: <20200527160543.GI37466@atomide.com>
References: <20200512203804.9340-1-faiz_abbas@ti.com>
 <20200513162327.GM37466@atomide.com>
 <94025425-95e2-e53d-cfac-a1e73e6c011a@ti.com>
 <53c815db-dd7d-e6e1-f81a-cf05ef340c71@ti.com>
 <20200519154807.GT37466@atomide.com>
 <e37ed4be-aed5-8051-a9fd-c0704d947d75@ti.com>
 <20200519160458.GU37466@atomide.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200519160458.GU37466@atomide.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

* Tony Lindgren <tony@atomide.com> [200519 09:05]:
> * 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.

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