linux-kernel - Re: mwifiex: pcie: implement timeout loop for FW programming doorbell

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Date:   Tue, 29 Nov 2016 15:28:56 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Amitkumar Karwar <akarwar@...vell.com>,
        Nishant Sarmukadam <nishants@...vell.com>,
        <linux-kernel@...r.kernel.org>, linux-wireless@...r.kernel.org,
        Cathy Luo <cluo@...vell.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Brian Norris <briannorris@...omium.org>
Subject: Re: mwifiex: pcie: implement timeout loop for FW programming doorbell

Brian Norris <briannorris@...omium.org> wrote:
> Marvell Wifi PCIe modules don't always behave nicely for PCIe power
> management when their firmware hasn't been loaded, particularly after
> suspending the PCIe link one or more times. When this happens, we might
> end up spinning forever in this status-polling tight loop. Let's make
> this less tight by adding a timeout and by sleeping a bit in between
> reads, as we do with the other similar loops.
> 
> This prevents us from hogging a CPU even in such pathological cases, and
> allows the FW initialization to just fail gracefully instead.
> 
> I chose the same polling parameters as the earlier loop in this
> function, and empirically, I found that this loop never makes it more
> than about 12 cycles in a sane FW init sequence. I had no official
> information on the actual intended latency for this portion of the
> download.
> 
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> Acked-by: Amitkumar Karwar <akarwar@...vell.com>

Patch applied to wireless-drivers-next.git, thanks.

22dde1ed5a48 mwifiex: pcie: implement timeout loop for FW programming doorbell

-- 
https://patchwork.kernel.org/patch/9442499/

Documentation about submitting wireless patches and checking status
from patchwork:

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches