Re: AP6275 / bcm43752 pcie on mainline brcmf

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

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

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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