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From:   Arend Van Spriel <arend.vanspriel@broadcom.com>
To:     Angus Ainslie <angus@akkea.ca>, Andy Green <andy@warmcat.com>
CC:     Shengyu Qu <wiagn233@outlook.com>, <franky.lin@broadcom.com>,
        <linux-wireless@vger.kernel.org>
Date:   Thu, 17 Nov 2022 19:12:11 +0100
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Subject: Re: AP6275 / bcm43752 pcie on mainline brcmf
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On November 17, 2022 5:06:25 PM Angus Ainslie <angus@akkea.ca> wrote:

> On 2022-11-17 04:01, Andy Green wrote:
>> On 11/17/22 09:23, Arend van Spriel wrote:
>>> On 11/16/2022 1:25 PM, Shengyu Qu wrote:
>>>> Got a new version of downstream driver and firmware here:
>>>> https://gitlab.com/rk3588_linux/linux/external/rkwifibt/-/tree/linux-5.10-gen-rkr3.4
>>>
>>> Thanks for that. The firmware indeed seems to originate from Synaptics
>>> and this module can be found on wifi-alliance product finder:
>>>
>>> https://www.wi-fi.org/product-finder-results?sort_by=certified&sort_order=desc&keywords=ap6275
>>>
>>> We have no known contacts there and they do not seem to have much
>>> interest in open-source. In that gitlab repo I see they are providing
>>> bcmdhd driver and I assume they consider that sufficient.
>>>
>>> Will see what I can do. First have to think on how to approach this
>>> failure to get most out of a debug effort. I do not have the module
>>> over here so we would need to go back and forth. The fact that the
>>> issue is seen on both SDIO and PCIe is somewhat encouraging.
>>
>> Yes it seems that at some point with some firmware, SDIO has worked
>> for, eg, Angus.  And, it should work well with bchdhd (but that does
>> not seem to work for scan for me on v6.1-rc5 uplevel with the firmware
>> load changed to use kernel apis; but the firmware has no timeout on
>> bcmdhd). So it doesn't feel a million miles away.
>
> This is the firmware we have been using for SDIO. It was sent to us
> directly by SparkLAN so not sure how it compares to other variants.
>
> https://source.puri.sm/Librem5/firmware-brcm43752-nonfree/-/tree/master/firmware/brcm

It is a tad bit older:

$ strings brcmfmac43752-sdio.bin | grep FW-TAG
<FW-TAG>4362a2-roml/config_sdio_ampak_release_he Version=18.35.387.23.7 
(b328500@shgit) (wlan=r880297) Date=2020-07-13T10:34:00Z FWID=01-f50fdff0

Thanks,
Arend

>
> Angus
>
>> I have the hw, and (paid) time to help with debugging this "pair of
>> hands" style. I'm also a little familiar with the kernel code and can
>> try jiggle things autonomously if you can prompt what is interesting.
>>
>> -Andy
>>
>>> Regards,
>>> Arend


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