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Thu, 17 Sep 2026 04:41:47 -0700 (PDT) X-Received: by 2002:a05:6a20:918e:b0:3d3:b00a:7082 with SMTP id adf61e73a8af0-3dd5f7b25d9mr16200066637.28.1789645307271; Thu, 17 Sep 2026 04:41:47 -0700 (PDT) Received: from [192.168.0.173] ([183.83.137.165]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-33bf5aa1e38sm16363362eec.16.2026.09.17.04.41.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 17 Sep 2026 04:41:46 -0700 (PDT) Message-ID: Date: Thu, 17 Sep 2026 17:11:40 +0530 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] media: iris: Skip SCM call for non-SCM PAS backend To: Sumit Garg , Konrad Dybcio Cc: Sumit Garg , Bjorn Andersson , Konrad Dybcio , Dikshita Agarwal , Abhinav Kumar , Bryan O'Donoghue , Mauro Carvalho Chehab , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, Jorge Ramirez-Ortiz , Jorge Ramirez-Ortiz References: <20260911-video-optee-pas-v1-v1-0-7bbddaaac5ba@kernel.org> <20260911-video-optee-pas-v1-v1-2-7bbddaaac5ba@kernel.org> <38fa7602-f03a-4343-9999-0eda108332e3@oss.qualcomm.com> Content-Language: en-US From: Vikash Garodia In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: Ec1MX4E4YtrsqGf67YeDTI-1wq303pO1 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE3MDE2MiBTYWx0ZWRfXyDsIGmtrIdKq WRSkuZaoCqBaHiWDF0EvI0G+m9kmmMbtIA0CFMBSHVUIlZspGmnPcdab6jFrq/kaq7IN25grZ5Q 3Ay4pPr+fB9CYuKbC5aVkXI1hi2/NY0= X-Proofpoint-GUID: Ec1MX4E4YtrsqGf67YeDTI-1wq303pO1 X-Authority-Analysis: v=2.4 cv=dOQzC+Zb c=1 sm=1 tr=0 ts=6aabd1fc cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=/MhRiX8TZM4BB34AAREmLw==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=pGLkceISAAAA:8 a=uP37DjD_T1UKT6mrzMwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE3MDE2MiBTYWx0ZWRfXx01WcvzUYJVF 1RblVLvUkiOME1eLtvom79tuO3Ub1+WmhYJtOSAHJVGFlZKfqYzsEnxBGyFhCY5vXbhc1gk9vHD TVS5nKcbAySqR6LMk52a+DpZig0Cf9FKBgoE8ZMFqKxrMw0fId7jkgpy9jD5FlBMacsi1Z2F7Fn gecbS9r4Q1HR6hqkM0wpjdPOdN9ECX16nSLTa7rcZkYOhtMperl/jO7dPF3YnVrB7Xf5cZbdw5P bNrYoWINCSALcat4gqWvIDUPeYj/PAIL23clJxbDYFw2N/4+qTiIsU7vFU80s7OeTzMXy+M09eU 9VT3RylHnaDPTMXmhtaGPXjtU0NUXrcu/l1z0JN7YZdAb+tL4ghKJbW3aQ7zPkBAGo4WVjK7sye V8woslsrCnhhbr+1LbB6/xBhSd+Mx2fgc4N0L4RzpIUzEIkdSc3Kngifp4iRooDQz1qzf7KppJq WEXNT3M8OpVVh6Y0ERg== 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=2026-09-17_02,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 suspectscore=0 malwarescore=0 priorityscore=1501 phishscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609170162 Hi Sumit, On 9/14/2026 11:44 AM, Sumit Garg wrote: > Hey Konrad, > > On Fri, Sep 11, 2026 at 7:54 PM Konrad Dybcio > wrote: >> >> On 9/11/26 2:38 PM, Sumit Garg wrote: >>> From: Jorge Ramirez-Ortiz >>> >>> qcom_scm_mem_protect_video_var() is only serviced by the SCM backend; >>> with OP-TEE the TEE owns secure memory protection. Use >>> qcom_pas_get_backend() to issue the SCM call only for the SCM backend. >>> >>> Assisted-by: Copilot:claude-opus-4.8 >>> Signed-off-by: Jorge Ramirez-Ortiz >>> Co-developed-by: Sumit Garg >>> Signed-off-by: Sumit Garg >>> --- >> >> [...] >> >>> + /* >>> + * qcom_scm_mem_protect_video_var() only applies to the SCM backend; >>> + * other backends (e.g. OP-TEE) own secure memory protection and do >>> + * not service this call. >> >> Can you not just stub it out in TF-A then? >> > > Please don't, we don't want to support these random SCM calls ABI per > subsystem with the open boot stack. All the config in this case for > video is handled by OP-TEE itself. Could you please help me understand the demerit in stubbing it out and let that be a dummy ABI in OPTEE world ? that way client driver can remain agnostic of the calls being routed to OPTEE or QTEE > > Instead we want to mostly support any subsystem specific TZ use-cases > as proper client drivers for the TEE subsystem. > > -Sumit Regards, Vikash