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

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Message-ID: <f9889aa3-65cc-49b3-ef51-8b098d052de1@linaro.org>
Date:   Wed, 7 Dec 2022 11:12:31 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>,
        Arend Van Spriel <aspriel@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Kalle Valo <kvalo@...nel.org>
Cc:     Alvin Šipraga <ALSI@...g-olufsen.dk>,
        Hector Martin <marcan@...can.st>,
        "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>,
        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>,
        "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 06/12/2022 12:22, Arend van Spriel wrote:
> On 12/6/2022 10:58 AM, Konrad Dybcio wrote:
>>
>>
>> On 02/12/2022 20:28, Arend Van Spriel wrote:
>>>
>>>
>>> On 12/2/2022 4:26 PM, Arend van Spriel wrote:
>>>> On 12/2/2022 11:33 AM, Konrad Dybcio wrote:
>>>>>
>>>>>
>>>>> On 1.12.2022 12:31, Arend van Spriel wrote:
>>>>>> 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.
>>>>>
>>>>> Hope this helps, thanks! https://hastebin.com/xidagekuge.yaml
>>>>
>>>> It does to some extent. It is basically a 4359 revision 9:
>>>>
>>>> [   25.898782] brcmfmac: brcmf_chip_recognition found AXI chip: 
>>>> BCM4359/9
>>>>
>>>> The 4359 entry in pcie.c is applicable for revision 0 and higher 
>>>> (doubtful but that is in the code):
>>>>
>>>>      BRCMF_FW_ENTRY(BRCM_CC_4359_CHIP_ID, 0xFFFFFFFF, 4359),
>>>>
>>>> We need to change the mask above to 0x000001FF and add a new entry 
>>>> with mask 0xFFFFFE00. All we need is come up with a reasonable 
>>>> firmware filename. So can you run the strings command on the 
>>>> firmware you use:
>>>>
>>>> $ strings fw.bin | tail -1
>>>>
>>>> and let me know the output.
>>>
>>> Actually realized you already provided a URL to the repo containing 
>>> the firmware you used. So I had a look and it shows:
>>>
>>> 43596a0-roml/pcie-ag-apcs-pktctx-proptxstatus-ampduhostreorder-lpc-die3-olpc-pspretend-mfp-ltecx-clm_43xx_somc_mimo-phyflags-txpwrctrls-dpo Version: 9.75.119.15 (r691661) CRC: a6cf427b Date: Fri 2017-03-24 13:24:25 KST Ucode Ver: 1060.20542 FWID: 01-e4abc35c
>>>
>>> However, from firmware perspective this is equivalent to 4359c0 so I 
>>> would suggest the change below.
>>>
>>> Let me know if that works.
>> Sorry for the late reply.
>>
>> Yes, it does seem to work just fine! The kernel now looks for 
>> brcm/brcmfmac4359c-pcie.sony,kagura-row.bin as we would expect.
>>
>> Could you submit this patch below to supersede my one?
> 
> I have no problem when you include this patch in yours and submit it to 
> the linux-wireless list.
Thanks, I'll do that soon!

Konrad
> 
> Regards,
> Arend