From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f98.google.com (mail-pj1-f98.google.com [209.85.216.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7CDB733B6E8 for ; Mon, 13 Jul 2026 16:15:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.98 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783959348; cv=none; b=MeQIh5d6f+Wgag0JLDRdbl9CKkAbde08UQ5ryoOGCtoNg/0Ly2skAqi/7nAgynT+6SasKv0l7a/1ttL4W03C86bI2wfxzKD614wlR5C02KCJZwcV2M3x8vE8aS4um0fN1kWGtUchtXPmbSsPEsFVf0QKEniEAG6TpCfFiqKNm6M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783959348; c=relaxed/simple; bh=kpzN1K/1x4AF0/6fUSNXG0/kwVHmGNC3IZ2uNKlJnFk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=TIVhJcfP6wRA3wpvUlrUXCzn91miX2zX5h3/ZZz4E2yoC2YZQRsTrhHAv+YbZOlglNLeY9yyKVZ0ccPgUjQAME3J5LmTzVKr98JNwKHhE+5wNSrHqEP3UVeWDLM/tHzdlEXquRlaRNhNyp5KUsQ5D6uvr+piGcGbe7UjiGs2Ya4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=broadcom.com; spf=fail smtp.mailfrom=broadcom.com; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b=WcM3sn5T; arc=none smtp.client-ip=209.85.216.98 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="WcM3sn5T" Received: by mail-pj1-f98.google.com with SMTP id 98e67ed59e1d1-38511175ad3so2694719a91.2 for ; Mon, 13 Jul 2026 09:15:42 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783959341; x=1784564141; h=content-transfer-encoding:content-type:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:dkim-signature:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to:content-type; bh=+S8ZLZuYEUhLxGBz9GbCPGNtlCQmD7r9ewmiP5lWBxw=; b=aBhUoY2mcfP5FDQNPhZlwwcjPH2ZGUSVQ1id8mTSK5MgmZ7suXJGrbkV2QrvFAOfEt r+th+JfU+SM67U3ST5bz92AHIxX/N9X/x16OopO6iURdPb2s1DdbpQ+Y5VgjtwbflqCL ef+qXUqNDNGWrCYyB2PTv2wy/COss87JdnGGgrgGygzp6cBTUlneEl7+NIRje7S1bKqo DLzG2ywgo2ANZJobL4pIqxMUWvcZVdSNUqZK+ZkmAv5dkQ2uNjB7U2EuUoJO2nccz1NZ 6o2w4QRVWy2ThEqNTIP7i0D42ogsVSX1toB1X4cVwpsRtbRBo+4dinz5Wud4ONBRNslA Ycdg== X-Forwarded-Encrypted: i=1; AHgh+RqxgKty7u331wL9DRxo26tznUn2YixVxjy/JnAIYHhtPevri4KaJJOhba8iP9yzWoKoI+WqPPx0hNmfw1Q=@vger.kernel.org X-Gm-Message-State: AOJu0YzkoojYOwNdKYBaJSGFSQdg/NYLjKWjzqh69476jEArI8VP0bxV TRr4uwJBbW7Z0VY6twE+tL6rwXpw+FaL1HwQFhgR/ioBgcLH1kslBBOBcFjGHUpUGG9l1c+TCsO DCUglLBNo6dqk9LwmXPrKdJR/OwIfSr9N19VyzdUQQ6unA2Sv/bXLWNT7096/wQWAThEeUCGPBQ pXuirKXBKNvMJEofluYQD8yGHAFQOxyK3Hts+DYce93DmfMRiw+CXf5K+yBxCFKd77kZFdp2CpT xW4zcUqnTaHm+kh9Mvzq8ei X-Gm-Gg: AfdE7cncazx0fyUerDsv47muB0Q0nj+p9aISn5h1ZLR24YBVQXUeiME9v/xMM+4V2NB cKTUhu3vwnErIsYjEh5zpcB8jovMSeNih9w6fgXEvNuhAXsDttrYYS9+px0ur8ukjU2YYCKkFlh eDKrCUPj7MDHoovSm9BhhYH8uKPrpvx4c7laDUMyWpqOVCecPYjn4i7T8ylKoSS95I7bWhNi+kQ ccHp+Znk2utookrWha7FtvsdXF7/nEO71iK2RhIKu4ewgqtDnY1Z2Yo1+5WAtxWneDVBQAjv02x vxTLX8DOGo+vPpHLR41N/n1yB200MxJcEjRCqO1X6TeZzy5H+crLi36dfw4MI4AfxdZwtrH7IG5 FOkZQeol/oAQjmm913UsbeK/xMhmbAXUNwVKpDlNe0j9sBykZupV+NUQJb18p2kIMykx0mSGth2 JQ6KqWFfnJx1HfFwNyQsCJLDpNx8HDUDRK0V9eOTsEnzPtKUzl X-Received: by 2002:a17:90b:1848:b0:381:b1ad:c9e4 with SMTP id 98e67ed59e1d1-38dc7755a44mr10055549a91.26.1783959341187; Mon, 13 Jul 2026 09:15:41 -0700 (PDT) Received: from smtp-us-east1-p01-i01-si01.dlp.protect.broadcom.com (address-144-49-247-6.dlp.protect.broadcom.com. [144.49.247.6]) by smtp-relay.gmail.com with ESMTPS id 98e67ed59e1d1-38e1730d773sm20312a91.8.2026.07.13.09.15.40 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 Jul 2026 09:15:41 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-qv1-f72.google.com with SMTP id 6a1803df08f44-904dac0f77fso39516016d6.1 for ; Mon, 13 Jul 2026 09:15:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1783959340; x=1784564140; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to :content-type; bh=+S8ZLZuYEUhLxGBz9GbCPGNtlCQmD7r9ewmiP5lWBxw=; b=WcM3sn5Tx5VnGQonQgnUy77nEjyRkLbXd8wpPniBsRDXokoGxupkaCLv9RLS2ixyYN 3rtENqfgFhBj78ialE9rwR4H6h5vq3A86reSVZGKVwpmQ/bDNap3oyHe6tt9lOss7W0l 3EUwoZDKKGD5v7HMxyroUT+x63oyz5PYslC6c= X-Forwarded-Encrypted: i=1; AHgh+RpWEHSOo16t4WXT7Gq6ketIWSlzs+cL4f1lZb45mWmxid66k2x+su0OBpNXN46qdXL1srimQdQ2wXBljVQ=@vger.kernel.org X-Received: by 2002:ac8:5fcd:0:b0:51c:7b11:41b9 with SMTP id d75a77b69052e-51cbf3304admr95112341cf.85.1783959339554; Mon, 13 Jul 2026 09:15:39 -0700 (PDT) X-Received: by 2002:ac8:5fcd:0:b0:51c:7b11:41b9 with SMTP id d75a77b69052e-51cbf3304admr95111761cf.85.1783959338898; Mon, 13 Jul 2026 09:15:38 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-51caab6e33csm84054751cf.5.2026.07.13.09.15.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Jul 2026 09:15:38 -0700 (PDT) Message-ID: <1c23b437-609c-470a-8b14-34288cb5aaa3@broadcom.com> Date: Mon, 13 Jul 2026 09:15:35 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] clocksource/drivers/arm_arch_timer: Workaround bcm2712 broken EL2 virtual timer To: Marc Zyngier , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: John , Daniel Drake , Marek Szyprowski , Daniel Lezcano , Thomas Gleixner , Mark Rutland References: <20260710080958.491620-1-maz@kernel.org> Content-Language: en-US, fr-FR From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; keydata= xsBNBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB AAHNMEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPsLB IQQQAQgAywUCZWl41AUJI+Jo+hcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFr ZXktdXNhZ2UtbWFza0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2Rp bmdAcGdwLmNvbXBncG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29t Lm5ldAUbAwAAAAMWAgEFHgEAAAAEFQgJChYhBNXZKpfnkVze1+R8aIExtcQpvGagAAoJEIEx tcQpvGagWPEH/2l0DNr9QkTwJUxOoP9wgHfmVhqc0ZlDsBFv91I3BbhGKI5UATbipKNqG13Z TsBrJHcrnCqnTRS+8n9/myOF0ng2A4YT0EJnayzHugXm+hrkO5O9UEPJ8a+0553VqyoFhHqA zjxj8fUu1px5cbb4R9G4UAySqyeLLeqnYLCKb4+GklGSBGsLMYvLmIDNYlkhMdnnzsSUAS61 WJYW6jjnzMwuKJ0ZHv7xZvSHyhIsFRiYiEs44kiYjbUUMcXor/uLEuTIazGrE3MahuGdjpT2 IOjoMiTsbMc0yfhHp6G/2E769oDXMVxCCbMVpA+LUtVIQEA+8Zr6mX0Yk4nDS7OiBlvOwE0E U8AbwQEIAKxr71oqe+0+MYCc7WafWEcpQHFUwvYLcdBoOnmJPxDwDRpvU5LhqSPvk/yJdh9k 4xUDQu3rm1qIW2I9Puk5n/Jz/lZsqGw8T13DKyu8eMcvaA/irm9lX9El27DPHy/0qsxmxVmU pu9y9S+BmaMb2CM9IuyxMWEl9ruWFS2jAWh/R8CrdnL6+zLk60R7XGzmSJqF09vYNlJ6Bdbs MWDXkYWWP5Ub1ZJGNJQ4qT7g8IN0qXxzLQsmz6tbgLMEHYBGx80bBF8AkdThd6SLhreCN7Uh IR/5NXGqotAZao2xlDpJLuOMQtoH9WVNuuxQQZHVd8if+yp6yRJ5DAmIUt5CCPcAEQEAAcLB gQQYAQIBKwUCU8AbwgUbDAAAAMBdIAQZAQgABgUCU8AbwQAKCRCTYAaomC8PVQ0VCACWk3n+ obFABEp5Rg6Qvspi9kWXcwCcfZV41OIYWhXMoc57ssjCand5noZi8bKg0bxw4qsg+9cNgZ3P N/DFWcNKcAT3Z2/4fTnJqdJS//YcEhlr8uGs+ZWFcqAPbteFCM4dGDRruo69IrHfyyQGx16s CcFlrN8vD066RKevFepb/ml7eYEdN5SRALyEdQMKeCSf3mectdoECEqdF/MWpfWIYQ1hEfdm C2Kztm+h3Nkt9ZQLqc3wsPJZmbD9T0c9Rphfypgw/SfTf2/CHoYVkKqwUIzI59itl5Lze+R5 wDByhWHx2Ud2R7SudmT9XK1e0x7W7a5z11Q6vrzuED5nQvkhAAoJEIExtcQpvGagugcIAJd5 EYe6KM6Y6RvI6TvHp+QgbU5dxvjqSiSvam0Ms3QrLidCtantcGT2Wz/2PlbZqkoJxMQc40rb fXa4xQSvJYj0GWpadrDJUvUu3LEsunDCxdWrmbmwGRKqZraV2oG7YEddmDqOe0Xm/NxeSobc MIlnaE6V0U8f5zNHB7Y46yJjjYT/Ds1TJo3pvwevDWPvv6rdBeV07D9s43frUS6xYd1uFxHC 7dZYWJjZmyUf5evr1W1gCgwLXG0PEi9n3qmz1lelQ8lSocmvxBKtMbX/OKhAfuP/iIwnTsww 95A2SaPiQZA51NywV8OFgsN0ITl2PlZ4Tp9hHERDe6nQCsNI/Us= In-Reply-To: <20260710080958.491620-1-maz@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 7/10/26 01:09, Marc Zyngier wrote: > It appears that the bcm2712 SoC found in the relatively popular > RPi5 has a broken EL2 virtual timer. > > We do not know the reason why the timer isn't working (the timer > is ticking, but the interrupt never fires), and the SoC vendor > doesn't communicate on the reason why this isn't working, leaving > users and maintainers in the dark. > > Paper over the issue by detecting the broken HW, falling back to > the physical timer instead, and let the user know about it. > Also taint the kernel as the machine is definitely not compliant > with the spec, and we don't know what else is wrong with it. > > Reported-by: John > Reported-by: Daniel Drake > Reported-by: Marek Szyprowski > Signed-off-by: Marc Zyngier > Cc: Florian Fainelli > Cc: Daniel Lezcano > Cc: Thomas Gleixner > Cc: Mark Rutland Acked-by: Florian Fainelli We know why now: the virtual interrupt timer line was never connected in the first place because it was not clarified that it was a requirement. I will also take the DTS patch through the Broadcom ARM SoC tree. Thanks! -- Florian