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

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Message-ID: <21fc5c0e-f880-7a14-7007-2d28d5e66c7d@linaro.org>
Date:   Tue, 6 Dec 2022 10:58:56 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Arend Van Spriel <aspriel@...il.com>,
        Arend van Spriel <arend.vanspriel@...adcom.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 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?

Konrad
> 
> Regards,
> Arend
> ---
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c 
> b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> index cf564adc612a..b59cf0f2939c 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> @@ -55,6 +55,7 @@ BRCMF_FW_CLM_DEF(4356, "brcmfmac4356-pcie");
>   BRCMF_FW_CLM_DEF(43570, "brcmfmac43570-pcie");
>   BRCMF_FW_DEF(4358, "brcmfmac4358-pcie");
>   BRCMF_FW_DEF(4359, "brcmfmac4359-pcie");
> +BCRMF_FW_DEF(4359C, "brcmfmac4359c-pcie");
>   BRCMF_FW_DEF(4364, "brcmfmac4364-pcie");
>   BRCMF_FW_DEF(4365B, "brcmfmac4365b-pcie");
>   BRCMF_FW_DEF(4365C, "brcmfmac4365c-pcie");
> @@ -83,7 +84,8 @@ static const struct brcmf_firmware_mapping 
> brcmf_pcie_fwnames[] = {
>       BRCMF_FW_ENTRY(BRCM_CC_43569_CHIP_ID, 0xFFFFFFFF, 43570),
>       BRCMF_FW_ENTRY(BRCM_CC_43570_CHIP_ID, 0xFFFFFFFF, 43570),
>       BRCMF_FW_ENTRY(BRCM_CC_4358_CHIP_ID, 0xFFFFFFFF, 4358),
> -    BRCMF_FW_ENTRY(BRCM_CC_4359_CHIP_ID, 0xFFFFFFFF, 4359),
> +    BRCMF_FW_ENTRY(BRCM_CC_4359_CHIP_ID, 0x000001FF, 4359),
> +    BRCMF_FW_ENTRY(BRCM_CC_4359_CHIP_ID, 0xFFFFFE00, 4359C),
>       BRCMF_FW_ENTRY(BRCM_CC_4364_CHIP_ID, 0xFFFFFFFF, 4364),
>       BRCMF_FW_ENTRY(BRCM_CC_4365_CHIP_ID, 0x0000000F, 4365B),
>       BRCMF_FW_ENTRY(BRCM_CC_4365_CHIP_ID, 0xFFFFFFF0, 4365C),
>