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[80.56.140.230]) by smtp.gmail.com with ESMTPSA id t27sm7203261pfg.41.2022.01.10.04.02.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Jan 2022 04:02:15 -0800 (PST) Message-ID: Date: Mon, 10 Jan 2022 13:02:06 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.0 Subject: Re: [PATCH v2 20/35] brcmfmac: pcie: Perform correct BCM4364 firmware selection To: Hector Martin , Kalle Valo , "David S. Miller" , Jakub Kicinski , Rob Herring , "Rafael J. Wysocki" , Len Brown , Arend van Spriel , Franky Lin , Hante Meuleman , Chi-hsien Lin , Wright Feng , Dmitry Osipenko Cc: Sven Peter , Alyssa Rosenzweig , Mark Kettenis , =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , Pieter-Paul Giesberts , Linus Walleij , Hans de Goede , "John W. Linville" , "brian m. carlson" , Andy Shevchenko , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com References: <20220104072658.69756-1-marcan@marcan.st> <20220104072658.69756-21-marcan@marcan.st> <3a957aa1-07f9-dff2-563e-656fffa0db6c@broadcom.com> From: Arend van Spriel In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000009f3fb805d5391b69" Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org --0000000000009f3fb805d5391b69 Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/10/2022 12:20 PM, Hector Martin wrote: > On 2022/01/10 18:12, Arend van Spriel wrote: >> On 1/4/2022 8:26 AM, Hector Martin wrote: >>> This chip exists in two revisions (B2=r3 and B3=r4) on different >>> platforms, and was added without regard to doing proper firmware >>> selection or differentiating between them. Fix this to have proper >>> per-revision firmwares and support Apple NVRAM selection. >>> >>> Revision B2 is present on at least these Apple T2 Macs: >>> >>> kauai: MacBook Pro 15" (Touch/2018-2019) >>> maui: MacBook Pro 13" (Touch/2018-2019) >>> lanai: Mac mini (Late 2018) >>> ekans: iMac Pro 27" (5K, Late 2017) >>> >>> And these non-T2 Macs: >>> >>> nihau: iMac 27" (5K, 2019) >>> >>> Revision B3 is present on at least these Apple T2 Macs: >>> >>> bali: MacBook Pro 16" (2019) >>> trinidad: MacBook Pro 13" (2020, 4 TB3) >>> borneo: MacBook Pro 16" (2019, 5600M) >>> kahana: Mac Pro (2019) >>> kahana: Mac Pro (2019, Rack) >>> hanauma: iMac 27" (5K, 2020) >>> kure: iMac 27" (5K, 2020, 5700/XT) >>> >>> Fixes: 24f0bd136264 ("brcmfmac: add the BRCM 4364 found in MacBook Pro 15,2") >>> Reviewed-by: Linus Walleij >>> Signed-off-by: Hector Martin >>> --- >>> .../net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 11 +++++++++-- >>> 1 file changed, 9 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c >>> index 87daabb15cd0..e4f2aff3c0d5 100644 >>> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c >>> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c >>> @@ -54,7 +54,8 @@ 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"); >>> -BRCMF_FW_DEF(4364, "brcmfmac4364-pcie"); >>> +BRCMF_FW_CLM_DEF(4364B2, "brcmfmac4364b2-pcie"); >>> +BRCMF_FW_CLM_DEF(4364B3, "brcmfmac4364b3-pcie"); >> >> would this break things for people. Maybe better to keep the old name >> for the B2 variant. > > Or the B3 variant... people have been using random copied firmwares with > the same name, I guess. Probably even the wrong NVRAMs in some cases. > And then I'd have to add a special case to the firmware extraction > script to rename one of these two to not include the revision... > > Plus, newer firmwares require the random blob, so this only ever worked > with old, obsolete firmwares... which I think have security > vulnerabilities (there was an AWDL exploit recently IIRC). > > Honestly though, there are probably rather few people using upstream > kernels on T2s. Certainly on the MacBooks, since the keyboard/touchpad > aren't supported upstream yet... plus given that there was never any > "official" firmware distributed under the revision-less name, none of > this would work out of the box with upstream kernels anyway. > > FWIW, I've been in contact with the t2linux folks and users have been > testing this patchset (that's how I got it tested on all the chips), so > at least some people are already aware of the story and how to get the > firmware named properly :-) Ok. When there is no brcmfmac4364-pcie.bin in linux-firmware repo we can safely rename. >>> - BRCMF_FW_ENTRY(BRCM_CC_4364_CHIP_ID, 0xFFFFFFFF, 4364), >>> + BRCMF_FW_ENTRY(BRCM_CC_4364_CHIP_ID, 0x0000000F, 4364B2), /* 3 */ >>> + BRCMF_FW_ENTRY(BRCM_CC_4364_CHIP_ID, 0xFFFFFFF0, 4364B3), /* 4 */ >> >> okay. so it is the numerical chip revision. If so, please drop that comment. >> > > I figured it would be useful to document this somewhere, since the > alphanumeric code -> rev number mapping doesn't seem to be consistent > from chip to chip, and we might have to add a new revision in the future > for an existing chip (which would require knowing the rev for the old > one). Do you have any ideas? Indeed the alphanumeric code differs from chip to chip depending on how much respins are necessary and what type of respin. We start a 'a0' aka numeric rev 0. 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