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From:   Arend Van Spriel <arend.vanspriel@broadcom.com>
To:     Angus Ainslie <angus@akkea.ca>
CC:     Andy Green <andy@warmcat.com>, Shengyu Qu <wiagn233@outlook.com>,
        <franky.lin@broadcom.com>, <linux-wireless@vger.kernel.org>
Date:   Sat, 03 Dec 2022 16:22:44 +0100
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Subject: Re: AP6275 / bcm43752 pcie on mainline brcmf
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On December 3, 2022 2:56:39 PM Angus Ainslie <angus@akkea.ca> wrote:

> On 2022-11-29 11:48, Arend van Spriel wrote:
>> On 11/17/2022 7:36 PM, Angus Ainslie wrote:
>>> On 2022-11-17 10:12, Arend Van Spriel wrote:
>>>> 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
>>>
>>> Currently it's broken for hotspot mode but I haven't had the chance to
>>> see if that is FW or something further up the stack.
>>
>> Hi Angus,
>>
>> When you added support for this device in brcmfmac you marked it as a
>> Cypress device. Are you sure about that? AFAICT this device is coming
>> from Synaptics.
>
> Hi Arend,
>
> I assumed Cypress based on the fact that it most closely resembled the
> 4373 from the driver side.

Right. Both are based on the same chip architecture that they brought from 
Broadcom so the similarities are not surprising.

> How would I figure out whether it's Cypress or Synaptics ?
>
> When I search the web for it I only find SparkLAN or "AMPAK technology"
> references.

Earlier my colleague Franky found this link to WFA certificate:

https://api.cert.wi-fi.org/api/certificate/download/public?variantId=103641

WFA and FCC are usually good sources of info. Also the product pages of the 
vendors are worth checking. I have them bookmarked out of professional 
interest ;-)

Regards,
Arend


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