linux-kernel - Re: [PATCH v2] brcmfmac: Add support for BCM43596 PCIe Wi-Fi

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Message-ID: <c83d7496-7547-2ab4-571a-60e16aa2aa3d@broadcom.com>
Date:   Thu, 1 Dec 2022 12:31:58 +0100
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Kalle Valo <kvalo@...nel.org>
Cc:     Alvin Šipraga <ALSI@...g-olufsen.dk>,
        Hector Martin <marcan@...can.st>,
        "~postmarketos/upstreaming@...ts.sr.ht" 
        <~postmarketos/upstreaming@...ts.sr.ht>,
        "martin.botka@...ainline.org" <martin.botka@...ainline.org>,
        "angelogioacchino.delregno@...ainline.org" 
        <angelogioacchino.delregno@...ainline.org>,
        "marijn.suijten@...ainline.org" <marijn.suijten@...ainline.org>,
        "jamipkettunen@...ainline.org" <jamipkettunen@...ainline.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Marek Vasut <marex@...x.de>,
        "Zhao, Jiaqing" <jiaqing.zhao@...el.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Soon Tak Lee <soontak.lee@...ress.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "brcm80211-dev-list.pdl@...adcom.com" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        "SHA-cyfmac-dev-list@...ineon.com" <SHA-cyfmac-dev-list@...ineon.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2] brcmfmac: Add support for BCM43596 PCIe Wi-Fi

On 11/28/2022 3:40 PM, Konrad Dybcio wrote:
> 
> 
> On 26.11.2022 22:45, Linus Walleij wrote:
>> On Fri, Nov 25, 2022 at 1:25 PM Kalle Valo <kvalo@...nel.org> wrote:
>>> Konrad Dybcio <konrad.dybcio@...aro.org> writes:
>>>
>>>> On 25.11.2022 12:53, Kalle Valo wrote:
>>>>> Konrad Dybcio <konrad.dybcio@...aro.org> writes:
>>>>>
>>>>>> On 21.11.2022 14:56, Linus Walleij wrote:
>>>>>>> On Fri, Nov 18, 2022 at 5:47 PM Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>>>>>>
>>>>>>>> I can think of a couple of hacky ways to force use of 43596 fw, but I
>>>>>>>> don't think any would be really upstreamable..
>>>>>>>
>>>>>>> If it is only known to affect the Sony Xperias mentioned then
>>>>>>> a thing such as:
>>>>>>>
>>>>>>> if (of_machine_is_compatible("sony,xyz") ||
>>>>>>>      of_machine_is_compatible("sony,zzz")... ) {
>>>>>>>     // Enforce FW version
>>>>>>> }
>>>>>>>
>>>>>>> would be completely acceptable in my book. It hammers the
>>>>>>> problem from the top instead of trying to figure out itsy witsy
>>>>>>> details about firmware revisions.
>>>>>>>
>>>>>>> Yours,
>>>>>>> Linus Walleij
>>>>>>
>>>>>> Actually, I think I came up with a better approach by pulling a page
>>>>>> out of Asahi folks' book - please take a look and tell me what you
>>>>>> think about this:
>>>>>>
>>>>>> [1]
>>>>>> https://github.com/SoMainline/linux/commit/4b6fccc995cd79109b0dae4e4ab2e48db97695e7
>>>>>> [2]
>>>>>> https://github.com/SoMainline/linux/commit/e3ea1dc739634f734104f37fdbed046873921af7
>>
>> Something in this direction works too.
>>
>> The upside is that it tells all operating systems how to deal
>> with the firmware for this hardware.
>>
>>>>> Instead of a directory path ("brcm/brcmfmac43596-pcie") why not provide
>>>>> just the chipset name ("brcmfmac43596-pcie")? IMHO it's unnecessary to
>>>>> have directory names in Device Tree.
>>>>
>>>> I think it's common practice to include a full $FIRMWARE_DIR-relative
>>>> path when specifying firmware in DT, though here I left out the board
>>>> name bit as that's assigned dynamically anyway. That said, if you don't
>>>> like it, I can change it.
>>>
>>> It's just that I have understood that Device Tree is supposed to
>>> describe hardware and to me a firmware directory "brcm/" is a software
>>> property, not a hardware property. But this is really for the Device
>>> Tree maintainers to decide, they know this best :)
>>
>> I would personally just minimize the amount of information
>> put into the device tree to be exactly what is needed to find
>> the right firmware.
>>
>> brcm,firmware-compatible = "43596";
>>
>> since the code already knows how to conjure the rest of the string.
>>
>> But check with Rob/Krzysztof.
>>
>> Yours,
>> Linus Walleij
> 
> Krzysztof, Rob [added to CC] - can I have your opinions?

I tried catching up on this thread. Reading it I am not sure what the 
issue is, but I am happy to dive in. If you can provide a boot log with 
brcmfmac loaded with module parameter 'debug=0x1416' I can try and make 
sense of the chipid/devid confusion.

Regards,
Arend

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