netdev - Re: [PATCH 0/3] mwifiex: disable ps_mode by default for stability

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Message-ID: <ea4f248fc656d9aa470fd0cfaae6b914cbe268ae.camel@gmail.com>
Date:   Fri, 30 Oct 2020 17:26:41 +0900
From:   Tsuchiya Yuto <kitakar@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Maximilian Luz <luzmaximilian@...il.com>, verdre@...d.nl
Subject: Re: [PATCH 0/3] mwifiex: disable ps_mode by default for stability

On Wed, 2020-10-28 at 17:21 +0200, Andy Shevchenko wrote:
> On Wed, Oct 28, 2020 at 11:24:30PM +0900, Tsuchiya Yuto wrote:
> > Hello all,
> > 
> > On Microsoft Surface devices (PCIe-88W8897), we are observing stability
> > issues when ps_mode (IEEE power_save) is enabled, then eventually causes
> > firmware crash. Especially on 5GHz APs, the connection is completely
> > unstable and almost unusable.
> > 
> > I think the most desirable change is to fix the ps_mode itself. But is
> > seems to be hard work [1], I'm afraid we have to go this way.
> > 
> > Therefore, the first patch of this series disables the ps_mode by default
> > instead of enabling it on driver init. I'm not sure if explicitly
> > disabling it is really required or not. I don't have access to the details
> > of this chip. Let me know if it's enough to just remove the code that
> > enables ps_mode.
> > 
> > The Second patch adds a new module parameter named "allow_ps_mode". Since
> > other wifi drivers just disable power_save by default by module parameter
> > like this, I also added this.
> > 
> > The third patch adds a message when ps_mode will be changed. Useful when
> > diagnosing connection issues.
> 
> > [1] https://bugzilla.kernel.org/show_bug.cgi?id=109681
> 
> Can you attach this to the actual patch as BugLink: tag?
> 

Thanks! Indeed I should have added this... I wrote it in the replies.
If I send the v2 version of this series, I'll add it to them.