linux-kernel - Re: [PATCH] mmc: dw_mmc: Disable SDIO interrupts while suspended to fix suspend/resume

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Date:   Fri, 26 Apr 2019 19:19:42 +0200
From:   Emil Renner Berthing <emil.renner.berthing@...il.com>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Jaehoon Chung <jh80.chung@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        Brian Norris <briannorris@...omium.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        stable@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Ryan Case <ryandcase@...omium.org>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: Re: [PATCH] mmc: dw_mmc: Disable SDIO interrupts while suspended to
 fix suspend/resume

Hi Doug,

TLDR: I'm no longer convinced this patch breaks suspend/resume more
than it already is. Sorry about the noise.

On Thu, 25 Apr 2019 at 23:25, Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Wed, Apr 24, 2019 at 1:19 AM Emil Renner Berthing
> <emil.renner.berthing@...il.com> wrote:
> >
> > Hi Douglas,
> >
> > Unfortunately this seems to beak resume on my rk3399-gru-kevin. I have
> > a semi-complicated setup with my rootfs as a btrfs on dmcrypt on
> > mmcblk0 which is the dw_mmc, so I'm guessing something goes wrong when
> > waking up the dm_mmc which probably wasn't suspended before this
> > patch. It's not 100% consistent though. Sometimes I see it resume the
> > first time I try suspending, but then 2nd time I suspend it won't come
> > back.
>
> Thanks for testing!

Thanks for your detailed response. It made me want to make absolutely
sure that this patch is the culprit.
As a baseline I booted a vanilla 5.0.9 and suspend/resumed it about a
dusin times without any errors.
So I applied this patch and immediately it crashed on suspend, but in
a way that I could still see the kernel log,
and it was the mwifiex driver that crashed. I rebooted and tried
supend/resume again and
this time it seemed like it was the dwc3 or usb3-phy that crashed.
I still have the kernel log if anyone is interested.
However 3rd time booting 5.0.9 with this patch suspend/resume just works.
At least the 2 dusin times I tried before giving up on making it crash.
I went back to vanilla 5.0.9 and after a few tries I managed to make
that one crash too.
I guess that means this patch is off the hook. I'm sorry about the
false report :/

/Emil