From: Doug Anderson <dianders@chromium.org>
To: Arend Van Spriel <arend.vanspriel@broadcom.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
Kalle Valo <kvalo@codeaurora.org>,
Adrian Hunter <adrian.hunter@intel.com>,
"open list:ARM/Rockchip SoC..."
<linux-rockchip@lists.infradead.org>,
Double Lo <double.lo@cypress.com>,
Brian Norris <briannorris@chromium.org>,
Madhan Mohan R <madhanmohan.r@cypress.com>,
Matthias Kaehlcke <mka@chromium.org>,
Wright Feng <wright.feng@cypress.com>,
Chi-Hsien Lin <chi-hsien.lin@cypress.com>,
brcm80211-dev-list.pdl@broadcom.com,
Franky Lin <franky.lin@broadcom.com>,
netdev <netdev@vger.kernel.org>,
linux-wireless <linux-wireless@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Hante Meuleman <hante.meuleman@broadcom.com>,
Naveen Gupta <naveen.gupta@cypress.com>,
brcm80211-dev-list@cypress.com,
YueHaibing <yuehaibing@huawei.com>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH 1/3] brcmfmac: re-enable command decode in sdio_aos for BRCM 4354
Date: Mon, 20 May 2019 11:20:22 -0700 [thread overview]
Message-ID: <CAD=FV=Uvc1wUQe-W1Jvm_gQ722pFm2a4OWvJDNVtkyQynFe4Gw@mail.gmail.com> (raw)
In-Reply-To: <e3f54bcb-8d10-1336-1458-2bd11cfc1010@broadcom.com>
Hi,
On Mon, May 20, 2019 at 1:09 AM Arend Van Spriel
<arend.vanspriel@broadcom.com> wrote:
>
> On 5/18/2019 12:54 AM, Douglas Anderson 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.
>
> This sounds very similar to the issue we had during integration of wifi
> on rk3288 chromebooks years ago.
I'm working on those same Chromebooks. ;-) I'm working on trying to
make them well on newer kernels.
...but I guess you're saying that the problem faced by the people who
wanted commit 29f6589140a1 ("brcmfmac: disable command decode in
sdio_aos") are similar to the problems we saw in the past on those
Chromebooks. I'd tend to agree. In general it's difficult to get a
SD Host Controller to be fully robust in the fact of any/all errors on
the bus. While dw_mmc is pretty robust these days I'm assuming that
some other host controllers aren't.
> > 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.
>
> I am leaning towards a full revert, but let's wait for more background info.
I'd be fine with a full revert too. Presumably that will break
someone but maybe they need to come up with a better solution?
-Doug
next prev parent reply other threads:[~2019-05-20 18:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-17 22:54 [PATCH 0/3] brcmfmac: sdio: Deal better w/ transmission errors waking from sleep Douglas Anderson
2019-05-17 22:54 ` [PATCH 1/3] brcmfmac: re-enable command decode in sdio_aos for BRCM 4354 Douglas Anderson
2019-05-20 8:09 ` Arend Van Spriel
2019-05-20 18:20 ` Doug Anderson [this message]
2019-05-28 12:18 ` Kalle Valo
[not found] ` <20190528121833.7D3A460A00@smtp.codeaurora.org>
2019-05-28 15:51 ` Doug Anderson
2019-05-28 16:09 ` Arend Van Spriel
2019-05-28 16:11 ` Arend Van Spriel
2019-06-04 3:20 ` Wright Feng
2019-06-04 16:01 ` Doug Anderson
2019-06-04 16:48 ` Arend Van Spriel
2019-05-29 14:51 ` Kalle Valo
2019-05-17 22:54 ` [PATCH 3/3] brcmfmac: sdio: Disable auto-tuning around commands expected to fail Douglas Anderson
2019-05-18 15:09 ` [PATCH 0/3] brcmfmac: sdio: Deal better w/ transmission errors waking from sleep Avri Altman
2019-05-21 0:23 ` Brian Norris
2019-05-20 8:55 ` Arend Van Spriel
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