Message-ID: <87ef3r9kts.fsf@kamboji.qca.qualcomm.com>
Date:   Tue, 18 Jun 2019 14:47:27 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        brcm80211-dev-list.pdl@...adcom.com,
        "open list\:ARM\/Rockchip SoC..." 
        <linux-rockchip@...ts.infradead.org>,
        Double Lo <double.lo@...ress.com>,
        Brian Norris <briannorris@...omium.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Naveen Gupta <naveen.gupta@...ress.com>,
        Madhan Mohan R <madhanmohan.r@...ress.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Wright Feng <wright.feng@...ress.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        netdev <netdev@...r.kernel.org>,
        brcm80211-dev-list <brcm80211-dev-list@...ress.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Allison Randal <allison@...utok.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Ritesh Harjani <riteshh@...eaurora.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Ondrej Jirman <megous@...ous.com>,
        Jiong Wu <lohengrin1024@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-mmc\@vger.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Avri Altman <avri.altman@....com>
Subject: Re: [PATCH v5 0/5] brcmfmac: sdio: Deal better w/ transmission errors related to idle

Ulf Hansson <ulf.hansson@...aro.org> writes:

> On Tue, 18 Jun 2019 at 13:02, Kalle Valo <kvalo@...eaurora.org> wrote:
>
>     Ulf Hansson <ulf.hansson@...aro.org> writes:
>     
>     > On Mon, 17 Jun 2019 at 19:57, Douglas Anderson
>     <dianders@...omium.org> wrote:
>     >>
>     >> This series attempts to deal better with the expected
>     transmission
>     >> errors related to the idle states (handled by the
>     Always-On-Subsystem
>     >> or AOS) on the SDIO-based WiFi on rk3288-veyron-minnie,
>     >> rk3288-veyron-speedy, and rk3288-veyron-mickey.
>     >>
>     >> Some details about those errors can be found in
>     >> <https://crbug.com/960222>, but to summarize it here: if we try
>     to
>     >> send the wakeup command to the WiFi card at the same time it
>     has
>     >> decided to wake up itself then it will behave badly on the SDIO
>     bus.
>     >> This can cause timeouts or CRC errors.
>     >>
>     >> When I tested on 4.19 and 4.20 these CRC errors can be seen to
>     cause
>     >> re-tuning. Since I am currently developing on 4.19 this was the
>     >> original problem I attempted to solve.
>     >>
>     >> On mainline it turns out that you don't see the retuning errors
>     but
>     >> you see tons of spam about timeouts trying to wakeup from
>     sleep. I
>     >> tracked down the commit that was causing that and have
>     partially
>     >> reverted it here. I have no real knowledge about Broadcom WiFi,
>     but
>     >> the commit that was causing problems sounds (from the
>     descriptioin) to
>     >> be a hack commit penalizing all Broadcom WiFi users because of
>     a bug
>     >> in a Cypress SD controller. I will let others comment if this
>     is
>     >> truly the case and, if so, what the right solution should be.
>     >>
>     >> For v3 of this series I have added 2 patches to the end of the
>     series
>     >> to address errors that would show up on systems with these same
>     SDIO
>     >> WiFi cards when used on controllers that do periodic retuning.
>     These
>     >> systems need an extra fix to prevent the retuning from
>     happening when
>     >> the card is asleep.
>     >>
>     >> I believe v5 of this series is all ready to go assuming Kalle
>     Valo is
>     >> good with it. I've added after-the-cut notes to patches
>     awaiting his
>     >> Ack and have added other tags collected so far.
>     >>
>     >> Changes in v5:
>     >> - Add missing sdio_retune_crc_enable() in comments (Ulf).
>     >> - /s/reneable/re-enable (Ulf).
>     >> - Remove leftover prototypes: mmc_expect_errors_begin() / end()
>     (Ulf).
>     >> - Rewording of "sleep command" in commit message (Arend).
>     >>
>     >> Changes in v4:
>     >> - Moved to SDIO API only (Adrian, Ulf).
>     >> - Renamed to make it less generic, now retune_crc_disable
>     (Ulf).
>     >> - Function header makes it clear host must be claimed (Ulf).
>     >> - No more WARN_ON (Ulf).
>     >> - Adjust to API rename (Adrian, Ulf).
>     >> - Moved retune hold/release to SDIO API (Adrian).
>     >> - Adjust to API rename (Adrian).
>     >>
>     >> Changes in v3:
>     >> - Took out the spinlock since I believe this is all in one
>     context.
>     >> - Expect errors for all of brcmf_sdio_kso_control() (Adrian).
>     >> - ("mmc: core: Export mmc_retune_hold_now() mmc_retune_release
>     ()") new for v3.
>     >> - ("brcmfmac: sdio: Don't tune while the card is off") new for
>     v3.
>     >>
>     >> Changes in v2:
>     >> - A full revert, not just a partial one (Arend). ...with
>     explicit Cc.
>     >> - Updated commit message to clarify based on discussion of v1.
>     >>
>     >> Douglas Anderson (5):
>     >> Revert "brcmfmac: disable command decode in sdio_aos"
>     >> mmc: core: API to temporarily disable retuning for SDIO CRC
>     errors
>     >> brcmfmac: sdio: Disable auto-tuning around commands expected to
>     fail
>     >> mmc: core: Add sdio_retune_hold_now() and sdio_retune_release()
>     >> brcmfmac: sdio: Don't tune while the card is off
>     >>
>     >> drivers/mmc/core/core.c | 5 +-
>     >> drivers/mmc/core/sdio_io.c | 77 +++++++++++++++++++
>     >> .../broadcom/brcm80211/brcmfmac/sdio.c | 17 ++--
>     >> include/linux/mmc/host.h | 1 +
>     >> include/linux/mmc/sdio_func.h | 6 ++
>     >> 5 files changed, 99 insertions(+), 7 deletions(-)
>     >>
>     >> --
>     >> 2.22.0.410.gd8fdbe21b5-goog
>     >>
>     >
>     > Applied for fixes, thanks!
>     >
>     > Some minor changes:
>     > 1) Dropped the a few "commit notes", that was more related to
>     version
>     > and practical information about the series.
>     > 2) Dropped fixes tags for patch 2->5, but instead put a stable
>     tag
>     > targeted for v4.18+.
>     >
>     > Awaiting an ack from Kalle before sending the PR to Linus.
>     >
>     > Kalle, perhaps you prefer to pick patch 1, as it could go
>     separate.
>     > Then please tell - and/or if there is anything else you want me
>     to
>     > change.
>     
>     TBH I haven't followed the thread (or patches) that closely :) So
>     feel
>     free to take them and push them to Linus.
>     
>
> I take that as an ack and will add your tag for it, thanks!

Yes, it was an ack :) I forgot to add:

Acked-by: Kalle Valo <kvalo@...eaurora.org>

BTW, your previous mail was in HTML so most likely it didn't reach the
list.

-- 
Kalle Valo

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