Message-ID: <CAPDyKFpaX6DSM_BjtghAHUf7qYCyEG+wMagXPUdgz3Eutovqfw@mail.gmail.com>
Date:   Mon, 17 Jun 2019 20:38:49 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Kalle Valo <kvalo@...eaurora.org>
Cc:     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@...r.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

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.

Kind regards
Uffe

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