netdev - Re: [PATCH v2 2/2] mwifiex: pcie: add reset_d3cold quirk for Surface gen4+ devices

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Date:   Sat, 10 Jul 2021 02:18:12 +0200
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     Pali Rohár <pali@...nel.org>
Cc:     Jonas Dreßler <verdre@...d.nl>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Tsuchiya Yuto <kitakar@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2 2/2] mwifiex: pcie: add reset_d3cold quirk for Surface
 gen4+ devices

On 7/10/21 2:07 AM, Pali Rohár wrote:

[...]

>> Interesting, I was not aware of this. IIRC we've been experimenting with
>> the mwlwifi driver (which that lrdmwl driver seems to be based on?), but
>> couldn't get that to work with the firmware we have.
> 
> mwlwifi is that soft-mac driver and uses completely different firmware.
> For sure it would not work with current full-mac firmware.
> 
>> IIRC it also didn't
>> work with the Windows firmware (which seems to be significantly
>> different from the one we have for Linux and seems to use or be modeled
>> after some special Windows WiFi driver interface).
> 
> So... Microsoft has different firmware for this chip? And it is working
> with mwifiex driver?

I'm not sure how special that firmware really is (i.e. if it is Surface
specific or just what Marvell uses on Windows), only that it doesn't
look like the firmware included in the linux-firmware repo. The Windows
firmware doesn't work with either mwlwifi or mwifiex drivers (IIRC) and
on Linux we use the official firmware from the linux-firmware repo.