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[144.49.247.6]) by smtp-relay.gmail.com with ESMTPS id ada2fe7eead31-744d6ea3857sm1358130137.24.2026.07.13.09.15.40 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 Jul 2026 09:15:40 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-qt1-f200.google.com with SMTP id d75a77b69052e-51c19493ac2so47166521cf.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=lists.infradead.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=KrArP6nPmeTYhQt/OhJ3v5uHQ3D8pjnDWOjYM/iOdId1/SSeGI3mhFte7XSwG9u0jT b2JlZ3IFMee+EmNDbzbrdRSh0UroKwE2sdgz44fmV21dgL7XjuZbK6yOy6y14BmUJkHY 7TcmYbpGb4y3xo34zCFvjSBZRsqdjHosJ0C/I= X-Forwarded-Encrypted: i=1; AHgh+Rq++XbMkUNxde3SZ2Yx3gK4jvSLHIxW9ToVnmfBNFvYJT6NA4xTUedU1dWX8KMxA8w2Gir+IR/ekB2lXr100cmP@lists.infradead.org X-Received: by 2002:ac8:5fcd:0:b0:51c:7b11:41b9 with SMTP id d75a77b69052e-51cbf3304admr95112351cf.85.1783959339566; 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 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; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260713_091542_695786_8FBDE683 X-CRM114-Status: GOOD ( 17.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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