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Sun, 23 Aug 2026 22:12:28 -0700 (PDT) X-Received: by 2002:a17:903:19cf:b0:2ca:53f7:3c69 with SMTP id d9443c01a7336-2d61a15e3e6mr370760325ad.9.1787548347751; Sun, 23 Aug 2026 22:12:27 -0700 (PDT) Received: from [10.206.101.140] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-327f91d37cesm25654613eec.15.2026.08.23.22.12.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 23 Aug 2026 22:12:26 -0700 (PDT) Message-ID: <8260df5e-700e-4719-c4ae-fed211dd000b@oss.qualcomm.com> Date: Mon, 24 Aug 2026 10:42:19 +0530 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH v2 1/5] media: iris: Add dma sync calls for input and output buffers Content-Language: en-US To: Dmitry Baryshkov Cc: Vikash Garodia , Dikshita Agarwal , Abhinav Kumar , Bryan O'Donoghue , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Stanimir Varbanov , Bjorn Andersson , Konrad Dybcio , Hans Verkuil , Stefan Schmidt , Hans Verkuil , Mansur Alisha Shaik , linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20260818-iris-fixes-dma-pseq-fint-v2-0-8dc8c4b3880e@oss.qualcomm.com> <20260818-iris-fixes-dma-pseq-fint-v2-1-8dc8c4b3880e@oss.qualcomm.com> <235vlp2bxpqpvgtcqlj3gyh2akclnit4p5lo2boagn4xsgzfeo@qnehnkaye2ru> From: Vishnu Reddy In-Reply-To: <235vlp2bxpqpvgtcqlj3gyh2akclnit4p5lo2boagn4xsgzfeo@qnehnkaye2ru> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI0MDA0NCBTYWx0ZWRfX0sz+STN3eKlo RomJspsaBHM3xkOs1U64uKMl6T9zmrNfZb0WbnAUZFtUOLM39FWQ6ZYtnc94dLMmI27lgok8SIl 3L8dbSGZOO4tonfZRWNjUqIV9jOmBWiauXo/u0HwBiiGcC3XqVrz+dSKcBz+t4tghGwnuZcD11Z 6F2jmnZrJJGSLCzGAf0wtjSMnRpL2e5hD5WftNpeN2Ohpqso2AH6NI9pwtA3pfX+m2yiEQq5Sc+ owqil6inDXq+GRfLxeWNQoJmLnpOuchosQazz4HGZ+mUKCD6ByQ/CdBuoWp5+pYqaFPx2XzF4GW Gab7Sj3vaJTpId49/5OsdgxBaYt7z9yIFiUk/1qw3l/A5JxpFQoB7br0lZozqONh/jiO7dXGSkQ 6JgiQf5g5RvZ8FD2Bf8OXJ1GJVHFynz67OEb1QMIWcYaVIGzLkpnhY1hQbLJOCenhiAjEfNSl7g IZgllRPGGZ51+Q+pSJQ== X-Authority-Analysis: v=2.4 cv=GvNyPE1C c=1 sm=1 tr=0 ts=6a8bd2bd cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=OMyujwfoVTX1xui5GF4A:9 a=QEXdDO2ut3YA:10 a=324X-CrmTo6CU4MGRt3R:22 X-Proofpoint-ORIG-GUID: VI3CVdeM4Wf3SoKQel7VtjaS9Bsyh7Uo X-Proofpoint-Spam-Info: AW1haW4tMjYwODI0MDA0NCBTYWx0ZWRfX4Kz7YlaQdMxr 8daoSfsCrYhu8ojpG09dGxaOuqYjqRDEH2y2J9762tgLyrC51uz/wUpPJDcUf2jYpCTASP5Y00L MnupLHy1aOWynAnP33fIbMGLX5PPOd4= X-Proofpoint-GUID: VI3CVdeM4Wf3SoKQel7VtjaS9Bsyh7Uo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-24_01,2026-08-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 adultscore=0 impostorscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608240044 On 8/19/2026 4:11 AM, Dmitry Baryshkov wrote: > On Tue, Aug 18, 2026 at 09:24:14PM +0530, Vishnu Reddy wrote: >> While testing with some higher resolution clips, the venus hardware >> triggers a fault due to wrong input data being received. Corruption >> was also observed in the captured output when the client dumped it >> to a file. >> >> On debugging, found that DMA buffers shared between the CPU and the >> venus video hardware/controller are not in sync. CPU writes to an input >> buffer can remain in CPU cache without being visible to the video >> hardware when it reads the same buffer, so the hardware receives input >> data that does not match what the CPU wrote. Likewise, on the capture >> path, data written by the video hardware to the output buffer may not >> be visible to the CPU, so the client reads stale or partial data, >> resulting in corruption. >> >> Add dma sync API calls to synchronize the data between the CPU cache >> and the venus hardware/controller. >> >> Signed-off-by: Vishnu Reddy >> --- >> drivers/media/platform/qcom/iris/iris_buffer.c | 7 +++++++ >> 1 file changed, 7 insertions(+) >> > Missing Fixes tag Ack. Will add in next revision. >