Re: AP6275 / bcm43752 pcie on mainline brcmf

[Arend Van Spriel <arend.vanspriel@xxxxxxxxxxxx>]

On December 3, 2022 2:56:39 PM Angus Ainslie <angus@xxxxxxxx> 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@xxxxxxxx> 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

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature