Linux-Wireless Archive on lore.kernel.org
 help / color / Atom feed
From: Ulf Hansson <ulf.hansson@linaro.org>
To: Doug Anderson <dianders@chromium.org>
Cc: Kalle Valo <kvalo@codeaurora.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Ganapathi Bhat <gbhat@marvell.com>,
	linux-wireless <linux-wireless@vger.kernel.org>,
	Andreas Fenkart <afenkart@gmail.com>,
	Brian Norris <briannorris@chromium.org>,
	Amitkumar Karwar <amitkarwar@gmail.com>,
	"open list:ARM/Rockchip SoC..."
	<linux-rockchip@lists.infradead.org>,
	Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Nishant Sarmukadam <nishants@marvell.com>,
	netdev <netdev@vger.kernel.org>,
	Avri Altman <avri.altman@wdc.com>,
	"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Xinming Hu <huxinming820@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Kate Stewart <kstewart@linuxfoundation.org>
Subject: Re: [PATCH v2 0/2] mmc: core: Fix Marvell WiFi reset by adding SDIO API to replug card
Date: Tue, 8 Oct 2019 13:49:04 +0200
Message-ID: <CAPDyKFoXh9dzunsac9M43gHky1HjWvEBXXGp5Mj=0g3APM36aw@mail.gmail.com> (raw)
In-Reply-To: <CAD=FV=W-qh2NnDc-C1_Tki3=D7vzNGG2PgnZjCjdLU9gL68AxA@mail.gmail.com>

On Tue, 8 Oct 2019 at 01:39, Doug Anderson <dianders@chromium.org> wrote:
>
> Hi,
>
> On Mon, Sep 16, 2019 at 2:25 AM Ulf Hansson <ulf.hansson@linaro.org> wrote:
> >
> > On Wed, 11 Sep 2019 at 23:26, Doug Anderson <dianders@chromium.org> wrote:
> > >
> > > Hi,
> > >
> > > On Thu, Jul 25, 2019 at 6:28 AM Ulf Hansson <ulf.hansson@linaro.org> wrote:
> > > >
> > > > On Mon, 22 Jul 2019 at 21:41, Douglas Anderson <dianders@chromium.org> wrote:
> > > > >
> > > > > As talked about in the thread at:
> > > > >
> > > > > http://lkml.kernel.org/r/CAD=FV=X7P2F1k_zwHc0mbtfk55-rucTz_GoDH=PL6zWqKYcpuw@mail.gmail.com
> > > > >
> > > > > ...when the Marvell WiFi card tries to reset itself it kills
> > > > > Bluetooth.  It was observed that we could re-init the card properly by
> > > > > unbinding / rebinding the host controller.  It was also observed that
> > > > > in the downstream Chrome OS codebase the solution used was
> > > > > mmc_remove_host() / mmc_add_host(), which is similar to the solution
> > > > > in this series.
> > > > >
> > > > > So far I've only done testing of this series using the reset test
> > > > > source that can be simulated via sysfs.  Specifically I ran this test:
> > > > >
> > > > > for i in $(seq 1000); do
> > > > >   echo "LOOP $i --------"
> > > > >   echo 1 > /sys/kernel/debug/mwifiex/mlan0/reset
> > > > >
> > > > >   while true; do
> > > > >     if ! ping -w15 -c1 "${GW}" >/dev/null 2>&1; then
> > > > >       fail=$(( fail + 1 ))
> > > > >       echo "Fail WiFi ${fail}"
> > > > >       if [[ ${fail} == 3 ]]; then
> > > > >         exit 1
> > > > >       fi
> > > > >     else
> > > > >       fail=0
> > > > >       break
> > > > >     fi
> > > > >   done
> > > > >
> > > > >   hciconfig hci0 down
> > > > >   sleep 1
> > > > >   if ! hciconfig hci0 up; then
> > > > >     echo "Fail BT"
> > > > >     exit 1
> > > > >   fi
> > > > > done
> > > > >
> > > > > I ran this several times and got several hundred iterations each
> > > > > before a failure.  When I saw failures:
> > > > >
> > > > > * Once I saw a "Fail BT"; manually resetting the card again fixed it.
> > > > >   I didn't give it time to see if it would have detected this
> > > > >   automatically.
> > > > > * Once I saw the ping fail because (for some reason) my device only
> > > > >   got an IPv6 address from my router and the IPv4 ping failed.  I
> > > > >   changed my script to use 'ping6' to see if that would help.
> > > > > * Once I saw the ping fail because the higher level network stack
> > > > >   ("shill" in my case) seemed to crash.  A few minutes later the
> > > > >   system recovered itself automatically.  https://crbug.com/984593 if
> > > > >   you want more details.
> > > > > * Sometimes while I was testing I saw "Fail WiFi 1" indicating a
> > > > >   transitory failure.  Usually this was an association failure, but in
> > > > >   one case I saw the device do "Firmware wakeup failed" after I
> > > > >   triggered the reset.  This caused the driver to trigger a re-reset
> > > > >   of itself which eventually recovered things.  This was good because
> > > > >   it was an actual test of the normal reset flow (not the one
> > > > >   triggered via sysfs).
> > > > >
> > > > > Changes in v2:
> > > > > - s/routnine/routine (Brian Norris, Matthias Kaehlcke).
> > > > > - s/contining/containing (Matthias Kaehlcke).
> > > > > - Add Matthias Reviewed-by tag.
> > > > > - Removed clear_bit() calls and old comment (Brian Norris).
> > > > > - Explicit CC of Andreas Fenkart.
> > > > > - Explicit CC of Brian Norris.
> > > > > - Add "Fixes" pointing at the commit Brian talked about.
> > > > > - Add Brian's Reviewed-by tag.
> > > > >
> > > > > Douglas Anderson (2):
> > > > >   mmc: core: Add sdio_trigger_replug() API
> > > > >   mwifiex: Make use of the new sdio_trigger_replug() API to reset
> > > > >
> > > > >  drivers/mmc/core/core.c                     | 28 +++++++++++++++++++--
> > > > >  drivers/mmc/core/sdio_io.c                  | 20 +++++++++++++++
> > > > >  drivers/net/wireless/marvell/mwifiex/sdio.c | 16 +-----------
> > > > >  include/linux/mmc/host.h                    | 15 ++++++++++-
> > > > >  include/linux/mmc/sdio_func.h               |  2 ++
> > > > >  5 files changed, 63 insertions(+), 18 deletions(-)
> > > > >
> > > >
> > > > Doug, thanks for sending this!
> > > >
> > > > As you know, I have been working on additional changes for SDIO
> > > > suspend/resume (still WIP and not ready for sharing) and this series
> > > > is related.
> > > >
> > > > The thing is, that even during system suspend/resume, synchronizations
> > > > are needed between the different layers (mmc host, mmc core and
> > > > sdio-funcs), which is common to the problem you want to solve.
> > > >
> > > > That said, I need to scratch my head a bit more before I can provide
> > > > you some feedback on $subject series. Moreover, it's vacation period
> > > > at my side so things are moving a bit slower. Please be patient.
> > >
> > > I had kinda forgotten about this series after we landed it locally in
> > > Chrome OS, but I realized that it never got resolved upstream.  Any
> > > chance your head has been sufficiently scratched and you're now happy
> > > with $subject series?  ;-)
> >
> > It's still on my TODO list. Apologize for the delay, but I still need
> > more time to look into it, possibly later this week.
> >
> > In any case, let's make sure we get this problem resolved for v5.5.
>
> Hi Ulf.  It's your friendly pest, Doug, here to ask how things are going.  :-P

:-)

The series on the top of my "things to review" list. I will definitely
provide you with some feedback then next days or so.

Again, sorry for the delay!

Kind regards
Uffe

  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-22 19:39 Douglas Anderson
2019-07-22 19:39 ` [PATCH v2 1/2] mmc: core: Add sdio_trigger_replug() API Douglas Anderson
2019-10-10 14:10   ` Ulf Hansson
2019-10-17  0:22     ` Doug Anderson
2019-10-17  9:10       ` Ulf Hansson
2019-07-22 19:39 ` [PATCH v2 2/2] mwifiex: Make use of the new sdio_trigger_replug() API to reset Douglas Anderson
2019-07-24 11:35   ` Kalle Valo
     [not found]   ` <20190724113508.47A356021C@smtp.codeaurora.org>
2019-07-24 20:22     ` Doug Anderson
2019-07-25  5:56       ` Kalle Valo
2019-07-25 13:28 ` [PATCH v2 0/2] mmc: core: Fix Marvell WiFi reset by adding SDIO API to replug card Ulf Hansson
2019-09-11 21:26   ` Doug Anderson
2019-09-16  9:25     ` Ulf Hansson
2019-10-07 23:39       ` Doug Anderson
2019-10-08 11:49         ` Ulf Hansson [this message]
2019-07-30  8:46 ` Andreas Fenkart
2019-07-30 16:59   ` Doug Anderson

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAPDyKFoXh9dzunsac9M43gHky1HjWvEBXXGp5Mj=0g3APM36aw@mail.gmail.com' \
    --to=ulf.hansson@linaro.org \
    --cc=adrian.hunter@intel.com \
    --cc=afenkart@gmail.com \
    --cc=amitkarwar@gmail.com \
    --cc=avri.altman@wdc.com \
    --cc=briannorris@chromium.org \
    --cc=davem@davemloft.net \
    --cc=dianders@chromium.org \
    --cc=gbhat@marvell.com \
    --cc=huxinming820@gmail.com \
    --cc=kstewart@linuxfoundation.org \
    --cc=kvalo@codeaurora.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mmc@vger.kernel.org \
    --cc=linux-rockchip@lists.infradead.org \
    --cc=linux-wireless@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=nishants@marvell.com \
    --cc=tglx@linutronix.de \
    --cc=wsa+renesas@sang-engineering.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Wireless Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-wireless/0 linux-wireless/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-wireless linux-wireless/ https://lore.kernel.org/linux-wireless \
		linux-wireless@vger.kernel.org
	public-inbox-index linux-wireless

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-wireless


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git