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 <c1a215cf-94be-871b-2a8a-3cc381588f83@free.fr> <6be2c348-b343-876a-a77f-a8297676de6a@free.fr>
 <a215e398-2c49-19d2-0730-5e8c51df1ed9@free.fr> <CA+8PC_du5dMwkmAshG2mM9TdeJft5aeAbEdDp0_q3Rxdvpq4MQ@mail.gmail.com>
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In-Reply-To: <f14407f1-e16f-0074-6e29-c597754ae617@free.fr>
From:   Franky Lin <franky.lin@broadcom.com>
Date:   Wed, 8 Mar 2023 09:21:32 -0800
Message-ID: <CA+8PC_dFTvv9VtY9jBWLLwSoQzGxQd57zWMsnN6amddop4Yw-g@mail.gmail.com>
Subject: Re: [RFC PATCH] brcmfmac: add 43751 SDIO ids and initialization
To:     Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc:     Neil Armstrong <neil.armstrong@linaro.org>,
        Arend van Spriel <aspriel@gmail.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>,
        Alexander Prutskov <alep@cypress.com>,
        Joseph chuang <jiac@cypress.com>,
        Kevin Hilman <khilman@baylibre.com>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Angus Ainslie <angus@akkea.ca>, linux-wireless@vger.kernel.org,
        linux-mmc@vger.kernel.org, linux-amlogic@lists.infradead.org
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On Wed, Mar 8, 2023 at 4:48=E2=80=AFAM Marc Gonzalez <marc.w.gonzalez@free.=
fr> wrote:
>
> On 08/03/2023 00:15, Franky Lin wrote:
>
> > On Tue, Mar 7, 2023 at 6:40=E2=80=AFAM Marc Gonzalez wrote:
> >
> >> Through the SDIO bus, the WiFi chip reports 0xaae7 (i.e. 43751)
> >> hence the /sys/bus/sdio/devices output above.
> >>
> >> sdio_read_func_cis() -> sdio_read_cis() which sets
> >> func->vendor/func->device to 2d0/aae7
> >>
> >>
> >> But when brcmf_chip_recognition() calls ci->ops->read32()
> >> i.e. brcmf_sdio_buscore_read32()
> >> [ vs brcmf_sdiod_readl() in brcmf_sdio_probe_attach() ]
> >>
> >> [    1.177283] brcmfmac: F1 signature read @0x18000000=3D0x1042aae8
> >> [    1.182912] found AXI chip: BCM43752/2
> >> [    1.186384] BCM43752/2: chip=3Daae8 rev=3D2 type=3D1
> >>
> >> Here it reports 0xaae8 (i.e. 43752)
> >>
> >> Why the discrepancy?
> >> Can it cause issues?
> >> (Sometimes, the whole SDIO bus doesn't probe at boot.
> >> I am still investigating these intermittent problems.)
> >>
> >> Should I use 43751 or 43752 firmware...?
> >
> > This question should be answered by the Cypress/Infineon folks but
> > unfortunately they have been quiet for a long time. In general we use
> > the id read from 0x18000000 to decide which firmware to load. But be
> > aware that the rev also matters. There are some examples in
> > brcmf_sdio_fwnames table that the different firmware name can be
> > derived from the same chip common id but different rev.
> >
> > However sdio device enumeration happens before firmware download so
> > the intermittent problem you are facing probably is not related to
> > firmware version.
>
> Disclosure: My knowledge of SDIO device enumeration is 0.
>
> When the host sends the equivalent of an "identify yourself" message
> on the SDIO bus, doesn't the reply come from the WiFi device?
> Why would the device reply 0xaae7 instead of 0xaae8?
>
> In other words, who is replying 0xaae7?

The enumeration response is done by the HW sdio core on the chip.  No
software involved.

Regards,
- Franky

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