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Fri, 22 May 2026 03:10:00 -0700 (PDT) X-Received: by 2002:a05:622a:260f:b0:50b:3489:5495 with SMTP id d75a77b69052e-516d46837a3mr26396861cf.8.1779444599558; Fri, 22 May 2026 03:09:59 -0700 (PDT) Received: from [192.168.119.254] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bddc65dbd3bsm39288766b.54.2026.05.22.03.09.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 May 2026 03:09:58 -0700 (PDT) Message-ID: <64950b97-7655-491a-9cfd-ee5ad0e7d840@oss.qualcomm.com> Date: Fri, 22 May 2026 12:09:56 +0200 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 01/35] dt-bindings: qcom,pdc: Tighten reg to single APSS DRV region To: Dmitry Baryshkov Cc: Mukesh Ojha , Thomas Gleixner , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20260410184124.1068210-1-mukesh.ojha@oss.qualcomm.com> <20260410184124.1068210-2-mukesh.ojha@oss.qualcomm.com> <5z7zoybn2gqsyn3zqvjo7saq2zjpoimkp67ubqenlntzcweyz3@rkm36ya6j44f> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <5z7zoybn2gqsyn3zqvjo7saq2zjpoimkp67ubqenlntzcweyz3@rkm36ya6j44f> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: 9WAXWYJBnjUlYzBv2RRKerxw7EiWaKuU X-Authority-Analysis: v=2.4 cv=JrbBas4C c=1 sm=1 tr=0 ts=6a102b78 cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=7tNU3UykEfeABMgLdikA:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-GUID: 9WAXWYJBnjUlYzBv2RRKerxw7EiWaKuU X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTIyMDEwMCBTYWx0ZWRfX/ePfy+03nkdS 5mINDdUYNDadeQhaunUhICsUFji3ltQ2JhDQiKiMdVpem4aFALcAza8V/r44lw426HnPEBJzaOz 6sLcWYjJ0VEbytdT8Lkw2uoljOr1v5Jhwwxn2GfbegyuWoUJLChoUgG4ow4ptrMCMzlBtLx+x90 3JI9bIEmeCzk14LGXmCsoY9TrbmPER6t4FDrth2TTZvRpqqWGSU0FM5HgyPsVKoMRIgwqdNQSjH Wpncq3y2VM22mzxM4zJgaBVlmQMh2aUdWi79ksOOA0kp9cZlIR5Iv/Yvj7YZK7v0RBpVbMcChdo bYaJlBdJtu32Gv4NvbLzSvyz8f2mxY4N/PxVm6sp1rtH1teRdoJbqyOGYW4qZtWZ9wAI84pRqEI K7juQP905S7A7qS8BkGK8lIgEBDmCbKdT4qTZ02G8HhVQeX/Gy23XnmduZqAkYA7qhgByNN+gUl B7FLwORkPv1Dsvaa1Ug== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-22_02,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 suspectscore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 spamscore=0 malwarescore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605220100 On 4/14/26 6:23 PM, Dmitry Baryshkov wrote: > On Mon, Apr 13, 2026 at 10:23:59AM +0200, Konrad Dybcio wrote: >> On 4/11/26 4:32 PM, Dmitry Baryshkov wrote: >>> On Sat, Apr 11, 2026 at 12:10:38AM +0530, Mukesh Ojha wrote: >>>> The PDC has multiple DRV regions, each sized 0x10000, where each region >>>> serves a specific client in the system. Linux only needs access to the >>> >>> Nit: there are other OS than Linux. Would you rather point out that >>> other DRV regions are to be used by ... what? >> >> TZ, HYP, HLOS, CPUCP.. > > => commit message > >> >> I'm wondering if we can make use of the HYP one on e.g. Glymur, to >> parallelize accesses (and whether that would bring any practical >> benefit). >> >> In the RPMH architecture, each "client" has their own (GPU, AOP, DISP, >> etc.). Then, each one of those clients may have an associates RSC >> (Resource State Coordinator) and/or anyOf BCM ("interconnect"), VRM >> ("regulator"), ARC ("RPMHPD") voting interfaces > > At least the RSC should be visible to the OS. We don't use it (now), but > we probably will at some point (at least the DISP_RSC) if I understand > it correctly. The display RSC is a separate instance, living at a far different register base. Same with the PCIe RSC etc. Konrad