From: Bjorn Helgaas <helgaas@kernel.org>
To: "Jonas Dreßler" <verdre@v0yd.nl>
Cc: "Amitkumar Karwar" <amitkarwar@gmail.com>,
"Ganapathi Bhat" <ganapathi017@gmail.com>,
"Xinming Hu" <huxinming820@gmail.com>,
"Kalle Valo" <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>,
"Jakub Kicinski" <kuba@kernel.org>,
"Tsuchiya Yuto" <kitakar@gmail.com>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Maximilian Luz" <luzmaximilian@gmail.com>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Pali Rohár" <pali@kernel.org>
Subject: Re: [PATCH] mwifiex: Ignore BTCOEX events from the 88W8897 firmware
Date: Mon, 29 Nov 2021 17:38:24 -0600 [thread overview]
Message-ID: <20211129233824.GA2703817@bhelgaas> (raw)
In-Reply-To: <20211129233209.GA2702252@bhelgaas>
On Mon, Nov 29, 2021 at 05:32:11PM -0600, Bjorn Helgaas wrote:
> On Wed, Nov 03, 2021 at 09:58:27PM +0100, Jonas Dreßler wrote:
> > The firmware of the 88W8897 PCIe+USB card sends those events very
> > unreliably, sometimes bluetooth together with 2.4ghz-wifi is used and no
> > COEX event comes in, and sometimes bluetooth is disabled but the
> > coexistance mode doesn't get disabled.
>
> s/sends those events/sends BTCOEX events/ so it reads well without the
> subject.
>
> s/coexistance/coexistence/
>
> Is BTCOEX a standard Bluetooth thing? Is there a spec reference that
> could be useful here? I've never seen those specs, so this is just
> curiosity. I did download the "Bluetooth Core Spec v5.3", which does
> have a "Wireless Coexistence Signaling and Interfaces" chapter, but
> "BTCOEX" doesn't appear in that doc.
>
> > This means we sometimes end up capping the rx/tx window size while
> > bluetooth is not enabled anymore, artifically limiting wifi speeds even
> > though bluetooth is not being used.
>
> s/artifically/artificially/
>
> > Since we can't fix the firmware, let's just ignore those events on the
> > 88W8897 device. From some Wireshark capture sessions it seems that the
> > Windows driver also doesn't change the rx/tx window sizes when bluetooth
> > gets enabled or disabled, so this is fairly consistent with the Windows
> > driver.
I hadn't read far enough to see that the patch was already applied,
sorry for the noise :)
next prev parent reply other threads:[~2021-11-29 23:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-03 20:58 [PATCH] mwifiex: Ignore BTCOEX events from the 88W8897 firmware Jonas Dreßler
2021-11-26 16:30 ` Kalle Valo
2021-11-29 23:32 ` Bjorn Helgaas
2021-11-29 23:38 ` Bjorn Helgaas [this message]
2021-11-30 10:15 ` Jonas Dreßler
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