From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D46C42D97A5; Fri, 2 Jan 2026 12:59:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767358763; cv=none; b=F1e+IGfifVfNzJ309WBYIXVNMI5mAEx2gAaeQgrLI1yv0HvevugN6a3oR1WICBfirzBXnVDIu/V06nXiAEvOcYdC/KPSSdJp6RKTBue3QuOhcDQL8szTk/aD1GfJkYfiztAf/EhKLoHarBzOlhCjxXnfXs52BSAw9Vgx6EE9hqM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767358763; c=relaxed/simple; bh=0HNMklHTvHB9imCtlxW24xEYJEJNLmxGMBEQacuxhWk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=L7IYW/opUHW004RXWakRsErNfDzK4tjr4BbtolpRGY55IF4lvvtIihhCy2N9ubYlXdf28jzLz6w3Hy5nAy36R9FYoeJ/UrqewOR2D9JFwOoza6sHTvnPoMWzv3Q+VzjOexAa/XBWjW44J6lPjgWJfGGUuCG0R69cPlYrhu0ph2c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CvsHpsgT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CvsHpsgT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00F7CC116B1; Fri, 2 Jan 2026 12:59:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767358762; bh=0HNMklHTvHB9imCtlxW24xEYJEJNLmxGMBEQacuxhWk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=CvsHpsgThBLXO14vVOMA0/dvEKx3MeypV4piHM+TwPJCPVXf1YajRun1aklIcZowA LfaNbwQTB7RWoKApl4evst8lquRhPUppNLygJg76R2n9Sr8ubqxhDh3eofBlSNiDxv DXMw6aBUgpyJWXpNAOHwmQ76HqLbX1amsQ6V8Jy6Zv2bcSD0Dp7dr13Xbn/2WzHpWO 5mWrJGcZZRRocVTpOhjtqGTbjauYjK/9TySVNW5c+naF/uHiIhJXfH3j6q3sWWLtqy MnrmOT6uWA4do46RTwLSvTQ3B2E6E0mIeQ+UEaAPNrVruBv2pI/4EjLp0ynphnWR6F 6nj1o4tFzvWQQ== Message-ID: <1dcc9380-c2c2-4263-93ad-71edce86b0da@kernel.org> Date: Fri, 2 Jan 2026 12:59:17 +0000 Precedence: bulk X-Mailing-List: linux-remoteproc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/9] remoteproc: qcom_q6v5_mss: Add MDM9607 To: Konrad Dybcio , barnabas.czeman@mainlining.org Cc: Bjorn Andersson , Mathieu Poirier , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Stephan Gerhold , linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251231-mss-v3-0-f80e8fade9ec@mainlining.org> <20251231-mss-v3-3-f80e8fade9ec@mainlining.org> <6bfc790d-b0da-4c5b-bd2d-ceed9a75bb24@kernel.org> <3i9J-ztSj5n83TPS7yQ3ngZYVpv2MnqVgpnkfywumw-hk2fPN3mty8T-vI2c-1Oh8V_ArprPioyoPxso6k2W0Q==@protonmail.internalid> <1440e47e-2d7b-4d49-97c4-a717fadd3fb6@oss.qualcomm.com> Content-Language: en-US From: Bryan O'Donoghue In-Reply-To: <1440e47e-2d7b-4d49-97c4-a717fadd3fb6@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 02/01/2026 12:00, Konrad Dybcio wrote: >> Is there an io-fabric in the world which exceeds 1 microsecond to perform a write transaction ? > Writes on arm64 aren't usually observable from the remote endpoint when > you would expect them to, they can be buffered unless there's an explicit > readback right afterwards (which creates a dependency that the processor > will fulfill) I don't mean write-combining cache, I mean posted versus non-posted writes which is a feature of the front-side-bus :) --- bod