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

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Date:   Tue, 4 Jun 2019 03:20:00 +0000
From:   Wright Feng <Wright.Feng@...ress.com>
To:     Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Doug Anderson <dianders@...omium.org>,
        Kalle Valo <kvalo@...eaurora.org>
CC:     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" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Naveen Gupta <Naveen.Gupta@...ress.com>,
        brcm80211-dev-list <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



On 2019/5/29 上午 12:11, Arend Van Spriel wrote:
> On May 28, 2019 6:09:21 PM Arend Van Spriel 
> <arend.vanspriel@...adcom.com> wrote:
> 
>> On May 28, 2019 5:52:10 PM Doug Anderson <dianders@...omium.org> wrote:
>>
>>> 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.
>>>> >
Since the commit 29f6589140a1 ("brcmfmac: disable command decode in 
sdio_aos") causes the regression on other SD card controller, it is 
better to revert it as you mentioned.
Actually, without the commit, we hit MMC timeout(-110) and hanged 
instead of CRC error in our test. Would you please share the analysis of 
dw_mmc issue which you fixed? We'd like to compare whether we got the 
same issue.

Regards,
Wright

>>>> > 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/
>>>
>>>
>>>> Please resend if/when I need to apply something.
>>>>
>>>> 2 patches set to Changes Requested.
>>>>
>>>> 10948785 [1/3] brcmfmac: re-enable command decode in sdio_aos for 
>>>> BRCM 4354
>>>
>>> As per Arend I'll change patch #1 to a full revert instead of a
>>> partial revert.  Arend: please yell if you want otherwise.
>>
>> No yelling here. If any it is expected from Cypress. Maybe good to add 
>> them
>> specifically in Cc:
> 
> Of the revert patch that is.
> 
> Gr. AvS
> 
>