Message-ID: <3d91a067-c9c3-6d71-11a7-1289ea67f109@free.fr>
Date:   Mon, 13 Mar 2023 14:55:29 +0100
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Subject: Re: [RFC PATCH] brcmfmac: add 43751 SDIO ids and initialization
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From:   Marc Gonzalez <marc.w.gonzalez@free.fr>
To:     Ulf Hansson <ulf.hansson@linaro.org>
Cc:     Neil Armstrong <neil.armstrong@linaro.org>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        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>,
        Pierre-Hugues Husson <phh@phh.me>,
        linux-wireless@vger.kernel.org, linux-mmc@vger.kernel.org,
        linux-amlogic@lists.infradead.org
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On 09/03/2023 18:51, Marc Gonzalez wrote:

> On 09/03/2023 15:29, Ulf Hansson wrote:
> 
>> To narrow down the problem, I would start by preventing the WiFi
>> driver from being insmoded. To make sure it doesn't affect the SDIO
>> card detection process.
>>
>> The point is, the SDIO card should be detected properly, no matter
>> whether there is a corresponding SDIO func driver (WiFi driver)
>> available for it. For a detected SDIO/eMMC/SD card, mmc_add_card()
>> prints a message about the card in the log during initialization. It
>> could look like the below print, for example:
>>
>> "mmc2: new ultra high speed SDR104 SDIO card at address 0001".
> 
> OK, I built the WiFi driver as a module which is NOT loaded at boot time.

Still trying to bisect this heisenbug into submission... :(

So far, I've pared it down to mmc_attach_sdio()

When probe WORKS, mmc_attach_sdio() returns 0.
When probe FAILS, mmc_attach_sdio() returns ETIMEDOUT
via mmc_send_io_op_cond(host, 0, &ocr);

Wrapping mmc_send_io_op_cond() in a loop
makes it work on the second try.

Would appreciate additional guidance. Am mostly stabbing in the dark :)

Regards