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Sun, 23 Aug 2026 22:21:24 -0700 (PDT) X-Received: by 2002:a17:902:da91:b0:2bf:27b2:4b80 with SMTP id d9443c01a7336-2d64b0b6ad2mr328234635ad.14.1787548884281; Sun, 23 Aug 2026 22:21:24 -0700 (PDT) Received: from [10.206.101.140] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-327f922ac7bsm21411128eec.25.2026.08.23.22.21.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 23 Aug 2026 22:21:23 -0700 (PDT) Message-ID: Date: Mon, 24 Aug 2026 10:51:14 +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 3/5] arm64: dts: qcom: sc7280: Add dma-coherent property into venus node Content-Language: en-US To: Krzysztof Kozlowski 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, stable@vger.kernel.org, Bryan O'Donoghue References: <20260818-iris-fixes-dma-pseq-fint-v2-0-8dc8c4b3880e@oss.qualcomm.com> <20260818-iris-fixes-dma-pseq-fint-v2-3-8dc8c4b3880e@oss.qualcomm.com> <20260819-daffy-armored-angelfish-3be5b1@quoll> From: Vishnu Reddy In-Reply-To: <20260819-daffy-armored-angelfish-3be5b1@quoll> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI0MDA0NSBTYWx0ZWRfXyHzJszqnV0Bj 8s+zMF26lhgHErPpjyErvlojVoZVF9Vgai5uQSP+sTYFxYEUDwvrb+jD4AEnYTU48Hdiv640HSv 3Eat8XwAOAe9sbbnSUq+nWAP9bVsSEX89eU32qpNzi8OWeoezUfoLCfJoDj0PQA0BKl+rq+KSsF /xgHso8uE53B79VeicMVQ4K3N5YEyDzx71+giCoJfkjlXwTgyWL3Tea17+a8A3jyvL0YBA4C/un DImbltxcdfp9Wa7zPSQFMt/rKKi8MprggmEZgFBycadvJHqPo0pgxS/sVW6epaJu9mAjevMuuMl rrCb6ecRF1tluK2Evnn5mTTtkicLo0r8roawf6chDQVjDXz907DmQcTUCOjXl6aT48oPlew2zWr EMMh4jLbcwgMrnC+2aLQCTMzE8M1+PGUdSAB74WbLfwHughyH2PhsYTDwN0Rv9Z54UeCY6ePcjX RhAsVlru5lNjeaCb/kw== X-Proofpoint-GUID: fd8RzoyRvu1k03YTzoWJIa6lKIAiaDHL X-Proofpoint-ORIG-GUID: fd8RzoyRvu1k03YTzoWJIa6lKIAiaDHL X-Proofpoint-Spam-Info: AW1haW4tMjYwODI0MDA0NSBTYWx0ZWRfX1Wgt+eHROnSH QFSlI4OHbhT1BwzTFaCLOgnLIxW8yWxRsSUcMQpBSqCMDcr4zxeH+/oYDxnTB78pw414lHsphB7 /NSZcWyMS7VE8xdB3Ec3wzrHyom2j0I= X-Authority-Analysis: v=2.4 cv=W8cIkxWk c=1 sm=1 tr=0 ts=6a8bd4d5 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=VwQbUJbxAAAA:8 a=F9kTNvDYw5psoUNgSeYA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 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 impostorscore=0 suspectscore=0 lowpriorityscore=0 spamscore=0 priorityscore=1501 clxscore=1015 bulkscore=0 malwarescore=0 adultscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608240045 On 8/19/2026 12:46 PM, Krzysztof Kozlowski wrote: > On Tue, Aug 18, 2026 at 09:24:16PM +0530, Vishnu Reddy wrote: >> The venus video hardware on SC7280 is IO-coherent hardware: even though >> the driver does dma_sync*() calls for the input and output buffers, the >> venus node still needs to declare dma-coherent so that the DMA mapping >> layer relies on this hardware level snooping to keep the CPU cache and >> the DMA buffers in sync. This avoids the unnecessary cache clean or >> invalidate operations performed by the dma_sync*() calls, which are not >> required once hardware level snooping is enabled via dma-coherent. >> >> Add the dma-coherent property to the venus node to describe this >> hardware capability. >> >> Fixes: 37613aee2179 ("arm64: dts: qcom: sc7280: Add venus DT node") >> Cc: stable@vger.kernel.org > Nope, nothing to be fixed here. I already said it last time. I'll remove it. > Best regards, > Krzysztof > >