netdev - Re: [PATCH 1/3] brcmfmac: re-enable command decode in sdio

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Date:   Wed, 29 May 2019 17:51:47 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Arend van Spriel <arend.vanspriel@...adcom.com>,
        Madhan Mohan R <MadhanMohan.R@...ress.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Brian Norris <briannorris@...omium.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "open list\:ARM\/Rockchip SoC..." 
        <linux-rockchip@...ts.infradead.org>,
        brcm80211-dev-list.pdl@...adcom.com,
        Matthias Kaehlcke <mka@...omium.org>,
        Naveen Gupta <naveen.gupta@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        brcm80211-dev-list@...ress.com, Double Lo <double.lo@...ress.com>,
        Franky Lin <franky.lin@...adcom.com>
Subject: Re: [PATCH 1/3] brcmfmac: re-enable command decode in sdio_aos for BRCM 4354

Doug Anderson <dianders@...omium.org> writes:

> Hi,
>
> On Tue, May 28, 2019 at 5:18 AM Kalle Valo <kvalo@...eaurora.org> wrote:
>>
>> Douglas Anderson <dianders@...omium.org> wrote:
>>
>> > In commit 29f6589140a1 ("brcmfmac: disable command decode in
>> > sdio_aos") we disabled something called "command decode in sdio_aos"
>> > for a whole bunch of Broadcom SDIO WiFi parts.
>> >
>> > After that patch landed I find that my kernel log on
>> > rk3288-veyron-minnie and rk3288-veyron-speedy is filled with:
>> >   brcmfmac: brcmf_sdio_bus_sleep: error while changing bus sleep state -110
>> >
>> > This seems to happen every time the Broadcom WiFi transitions out of
>> > sleep mode.  Reverting the part of the commit that affects the WiFi on
>> > my boards fixes the problem for me, so that's what this patch does.
>> >
>> > Note that, in general, the justification in the original commit seemed
>> > a little weak.  It looked like someone was testing on a SD card
>> > controller that would sometimes die if there were CRC errors on the
>> > bus.  This used to happen back in early days of dw_mmc (the controller
>> > on my boards), but we fixed it.  Disabling a feature on all boards
>> > just because one SD card controller is broken seems bad.  ...so
>> > instead of just this patch possibly the right thing to do is to fully
>> > revert the original commit.
>> >
>> > Fixes: 29f6589140a1 ("brcmfmac: disable command decode in sdio_aos")
>> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
>>
>> I don't see patch 2 in patchwork and I assume discussion continues.
>
> Apologies.  I made sure to CC you individually on all the patches but
> didn't think about the fact that you use patchwork to manage and so
> didn't ensure all patches made it to all lists (by default each patch
> gets recipients individually from get_maintainer).  I'll make sure to
> fix for patch set #2.  If you want to see all the patches, you can at
> least find them on lore.kernel.org linked from the cover:
>
> https://lore.kernel.org/patchwork/cover/1075373/

No worries, I had the thread on my email but was just too busy to check.
So I instead wrote down my thought process so that somebode can correct
me in case I have misunderstood. I usually do that when it's not clear
what the next action should be.

-- 
Kalle Valo