linux-kernel - RE: rcar_gen3_phy_usb2: unbalanced disables for USB20

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Date:   Wed, 5 Jun 2019 12:09:10 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: rcar_gen3_phy_usb2: unbalanced disables for USB20_VBUS0

Hi Geert-san,

> From: Geert Uytterhoeven, Sent: Wednesday, June 5, 2019 4:03 PM
> 
> Hi Shimoda-san,
> 
> On Wed, Jun 5, 2019 at 6:06 AM Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@...esas.com> wrote:
> > > From: Geert Uytterhoeven, Sent: Wednesday, June 5, 2019 3:06 AM
> > > Using a tree based on renesas-drivers-2019-06-04-v5.2-rc3, I started seeing
> > > the following warning during a second system suspend (s2idle):
> > <snip>
> > > So far I've seen this on Salvator-X with R-Car H3 ES1.0 or M3-W, and
> > > on Salvator-XS with R-Car M3-N, but not (yet?) on H3 ES2.0.
> >
> > I could reproduce this issue on R-Car H3 ES3.0 with Suspend-to-RAM.
> > # I'm silly but I could not use s2idle that didn't wake up by ravb.
> > # https://elinux.org/R-Car/Boards/Salvator-X#Suspend-to-Idle
> 
> With CONFIG_PM_DEBUG=y and CONFIG_PM_TEST_SUSPEND=y, you can use
> 
>      echo platform > /sys/power/pm_test
> 
> to configure the system to wake up from s2idle after 5 seconds.
> This allows to loop s2idle without user intervention.

Thank you for explanation! I could use it on my environment.

Best regards,
Yoshihiro Shimoda