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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b935aec4426sm162355466b.56.2026.02.27.08.49.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 27 Feb 2026 08:49:14 -0800 (PST) Message-ID: <6fe3a1a8-46c7-427c-abb5-2e7366a43392@oss.qualcomm.com> Date: Fri, 27 Feb 2026 17:49:11 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/7] media: iris: switch to hardware mode after firmware boot To: Vikash Garodia , Dikshita Agarwal , Abhinav Kumar , Bryan O'Donoghue , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Saravana Kannan , Joerg Roedel , Will Deacon , Robin Murphy , Stefan Schmidt , Hans Verkuil , Krzysztof Kozlowski , Vishnu Reddy , Hans Verkuil Cc: linux-arm-msm@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, Bryan O'Donoghue References: <20260227-kaanapali-iris-v2-0-850043ac3933@oss.qualcomm.com> <20260227-kaanapali-iris-v2-2-850043ac3933@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260227-kaanapali-iris-v2-2-850043ac3933@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=BOC+bVQG c=1 sm=1 tr=0 ts=69a1cb0c cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=uMIPjMpX8He5E15aO8IA:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-GUID: dSWAjQNCQI5Gwjj5mNN18ccdLWTNVriV X-Proofpoint-ORIG-GUID: dSWAjQNCQI5Gwjj5mNN18ccdLWTNVriV X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDE1MCBTYWx0ZWRfX5MqVmH0iy5wB dh12nT/9119OW6rf1RQ5QmgJJpj9pia4009FRtuMZ13BdUt8HFKP8Ivl9PCNqDybbrClMkpQM38 InWtz9yedYizbqIPP4EBzUH4q/nW7EjPEKxcAgEse022qwIL6QYlSPqfSh0M18JkDK+Rq/vV25z q+ABC8vvxDcxM7AQXfIzepI/WOVVqOFzGUYWvMv+spbViRB89fGeSsM2kK/nZqrPe3qnx/ZM5b0 mnL4m+Rtkt8VyDbR4XdFdWCWNafCLe+KtgHek/r6SUmsHdLZHWoJruDyQ8djoHiZ/5DOrGXtusN 5QcpSqGLXZAaRSjjV9yAZTX/c3MjSR3+RYJQt9Zlq68rLY/fiDvzX+oKoX7UHOwx+OUK385HoBQ rW1jrpMh2wNxhhuaH1GXd0L3AMoVV+7LlDRUc7aHN7CWoxsyCI518LLEb1vFq0+bbcvpViDUNuP CiOhCaLurTijB9EhPbQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-27_03,2026-02-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 spamscore=0 suspectscore=0 phishscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 adultscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602270150 On 2/27/26 3:11 PM, Vikash Garodia wrote: > Currently the driver switches the vcodec GDSC to hardware (HW) mode > before firmware load and boot sequence. GDSC can be powered off, keeping > in hw mode, thereby the vcodec registers programmed in TrustZone (TZ) > carry default (reset) values. > Move the transition to HW mode after firmware load and boot sequence. > > The bug was exposed with driver configuring different stream ids to > different devices via iommu-map. With registers carrying reset values, > VPU would not generate desired stream-id, thereby leading to SMMU fault. > > For vpu4, when GDSC is switched to HW mode, there is a need to perform > the reset operation. Without reset, there are occassional issues of > register corruption observed. Hence the vpu GDSC switch also involves > the reset. Is that a characteristic of the hardware (e.g. also seen downstream), or is that required with upstream iris only? Konrad