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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b8037f511fesm4642072066b.65.2026.01.02.06.02.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 02 Jan 2026 06:03:00 -0800 (PST) Message-ID: <15e41ffe-66f1-43ec-b0af-241041c25f9d@oss.qualcomm.com> Date: Fri, 2 Jan 2026 15:02:58 +0100 Precedence: bulk X-Mailing-List: devicetree@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: Bryan O'Donoghue , 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> <1dcc9380-c2c2-4263-93ad-71edce86b0da@kernel.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <1dcc9380-c2c2-4263-93ad-71edce86b0da@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: axU1WeFB23mV_H9kjGlvloEzfNig1o5W X-Authority-Analysis: v=2.4 cv=IssTsb/g c=1 sm=1 tr=0 ts=6957d016 cx=c_pps a=S/uc88zpIJVNbziUnJ6G4Q==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=7CQSdrXTAAAA:8 a=zBxm4P68afzicwOvg-8A:9 a=QEXdDO2ut3YA:10 a=zgiPjhLxNE0A:10 a=nd2WpGr1bMy9NW-iytEl:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-GUID: axU1WeFB23mV_H9kjGlvloEzfNig1o5W X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTAyMDEyNSBTYWx0ZWRfX2c/cvh4+diRc rWK0UfODQv3XOHiiA0jFc4Sk1uN6i3N/IBdoj+lTBc7h6VaZl3lL3p5BXLc0UX70qvq7VEz7i5L AgqCe6u0jLXKkuxm9Chp7yekxshMX+SwS3ukeTcgPivgwDaxPX5SCSeTfNrjOeMrTzfe7BfrtZZ /XWpaUBVICoig8LaInmt443Osqp0DStF0ohlNYKg9YWFopOT/PlEBXU78yTG/a1CY/vjQlTqHLO LsR2/4GppOf5ZFPxw3v2MFKt/u2nbwPggOMI0QppGX0bATt6OqQyFcE1mqH2eZ59wRWzRLsZvfD f/4K1L1eGIWJLcz1JKvGKHDiFof7l97JtJDCitGT3o87JKbezSTjzb8VO1VziUTpfPzyOgm66ry nABpt3eBc7mG99uRtoHtAWwSUa+XByVt3PFTQ3WLjCyArw+LHlf19Ke8qtH2M/9iMQ/Civ7Ba9R lnImxk18zBftVd9V+iA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-02_02,2025-12-31_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 suspectscore=0 priorityscore=1501 adultscore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601020125 On 1/2/26 1:59 PM, Bryan O'Donoghue wrote: > 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 :) Writes are posted (Device-nGnRE, note the E attribute is set) https://documentation-service.arm.com/static/63a43e333f28e5456434e18b Konrad