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Thu, 15 Oct 2026 02:43:24 -0700 (PDT) X-Received: by 2002:ac8:59c6:0:b0:51c:2324:666 with SMTP id d75a77b69052e-5359fa50f67mr353276251cf.3.1792057403109; Thu, 15 Oct 2026 02:43:23 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c3ed6be6facsm106366566b.12.2026.10.15.02.43.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Oct 2026 02:43:22 -0700 (PDT) Message-ID: <9ae0c4e2-35cd-402e-96d0-eccfe26e622b@oss.qualcomm.com> Date: Thu, 15 Oct 2026 11:43:19 +0200 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 , Vikash Garodia 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: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE1MDAzOCBTYWx0ZWRfX0KRSXaafEBdm rooBoOAcX1vfKmDGkE+pEqOHhOE91aRZFPoZ0sz48eW9JngHosk878w8vucqr48TOlTAZVg5EN8 RkrAKg/rQDvZvvjI09mASMxuLAlR5s/HS7RVPQ/mLLLzRg12YCh3dxZnhGap6whcQgwuqaNi98c mZcRff8+UuvmG/mJ8lPYDNVnIEXxDkYotW7lulUbqvSAspqVstlnSvVFScJO2hr/t+cTRSWQJpX eNFLa+GHnMKK16uVfAJJx3qhECCm15LGt7bi97YrGTYfoxMPeuNM15KS0rhT2edxQkanvNR0J5J qEG20/ENd8ExehWTzM8pc4P2oICTYEThtNmKdVqv6CK4Oqf1ficueMW7tw0060i/+nsyTn6Yah0 cO21nH0M/T0HNH60iYuxmRyLgxp9qSJOTMLGQpI3tbXgR8eFHMuCdR/EYaaIxa1LJuyDC6idonU 0RYnT7KkHK4/5a+b4oQ== X-Proofpoint-GUID: uuklKcQJqWFU52UxYQafs3Ol2jnV9BRb X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE1MDAzOCBTYWx0ZWRfXxyW5AhVDEPnh Owi0fUViV2FfqhCm5smVgA4uMC2w5lXIt7K7Bt0ZjSemY5lnxtkFWnyp76GuZNviEsYySywwJn0 HutFb2FgoRuabwy+RE/6XRLW4Yfzvac= X-Authority-Analysis: v=2.4 cv=BqUIUoX5 c=1 sm=1 tr=0 ts=6ad0a03c cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=EUspDBNiAAAA:8 a=XeEdsXCBUZsRL06xsssA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-ORIG-GUID: uuklKcQJqWFU52UxYQafs3Ol2jnV9BRb 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=2026-10-13_01,2026-10-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 spamscore=0 bulkscore=0 suspectscore=0 clxscore=1015 malwarescore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610150038 On 9/18/26 1:10 PM, Sumit Garg wrote: > Hey Vikash, > > On Thu, Sep 17, 2026 at 5:11 PM Vikash Garodia > wrote: >> >> Hi Sumit, >> >> On 9/14/2026 11:44 AM, Sumit Garg wrote: >>> Hey Konrad, [...] > The main disadvantage is that we don't want to carry these custom SCM > ABIs per kernel subsystem with the open source TF-A/OP-TEE boot stack. > ABIs always come with maintenance burdens, especially the custom ones > we have in this case. > > Since we started from scratch for the open source boot stack, the > motivation is to keep the TZ ABI minimal and that too with > discoverable OP-TEE services like the PAS service. Okay, I can symphatize with that. Let's think of another solution though, as a strcmp over the provider name is 10x worse. What is the planned replacement on the open boot stack side? FF-A lend? Konrad