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Fri, 14 Nov 2025 03:26:56 -0800 (PST) X-Google-Smtp-Source: AGHT+IFgKCyHJGBBYPB4qZv+EAl4Tx88PJN32VSjZcg29sFOWP5dg9DS3lwkBEwjYg2dmQ/BXtGF2A== X-Received: by 2002:a17:90a:d408:b0:33b:b020:597a with SMTP id 98e67ed59e1d1-343f99c1cc3mr3251153a91.0.1763119615473; Fri, 14 Nov 2025 03:26:55 -0800 (PST) Received: from [192.168.1.8] ([106.222.229.203]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3456516c622sm167599a91.9.2025.11.14.03.26.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 14 Nov 2025 03:26:55 -0800 (PST) Message-ID: <76523142-b337-4a31-90d2-c8477ef0b270@oss.qualcomm.com> Date: Fri, 14 Nov 2025 16:56:45 +0530 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 11/21] drm/msm/a6xx: Improve MX rail fallback in RPMH vote init To: Konrad Dybcio Cc: Rob Clark , Bjorn Andersson , Konrad Dybcio , Sean Paul , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Marijn Suijten , David Airlie , Simona Vetter , Jonathan Marek , Jordan Crouse , Will Deacon , Robin Murphy , Joerg Roedel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Connor Abbott , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, devicetree@vger.kernel.org References: <20251110-kaana-gpu-support-v2-0-bef18acd5e94@oss.qualcomm.com> <20251110-kaana-gpu-support-v2-11-bef18acd5e94@oss.qualcomm.com> Content-Language: en-US From: Akhil P Oommen In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=L+AQguT8 c=1 sm=1 tr=0 ts=69171201 cx=c_pps a=0uOsjrqzRL749jD1oC5vDA==:117 a=UUXEStRZTiKyGgBwSCQbmw==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=lZFDvItL9zSOf8gjBGIA:9 a=QEXdDO2ut3YA:10 a=mQ_c8vxmzFEMiUWkPHU9:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE0MDA5MSBTYWx0ZWRfX4UGoDbWr+EdK 6Qe/45O6QX0u/jfl1xbkS//BaMAvVDveJ5c2aoFWMtlgTZ9FIexSiaIiC0gP955Y7wkIN9pCryQ tSZXUwtnu8NNDcYatH9l62N0H/rDNnEn35HbbKkWJyG82PZGGy6ann2MwRL01fkfsSV+8nwWjZO LjenhhYyG/8rPAsZGxCsGqixdphkqRxfstMT+POrzC0tmkVc+MYSCnoMMJgBspEB8EkwicDTVq1 EIcdovhkVnJpU0I1i1idItNRX2T3nNdubhBJGyoH32t/0e8au4RZWn/HVk9c6m0Y2Fb6fMvLbGd ZkXsYZeMyVea0VI1DVyadLOJhtjW9jg6E7XbaYrc3c7d2tgvytlqVA+sZpR6sDWSHbP++K1ORvO T53TZpLsqWiY4B2YHCfZCJoIDIov4g== X-Proofpoint-ORIG-GUID: RPVghEMPxcofmjkCRjsh4KYrEaMoHdZR X-Proofpoint-GUID: RPVghEMPxcofmjkCRjsh4KYrEaMoHdZR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-14_03,2025-11-13_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 impostorscore=0 priorityscore=1501 adultscore=0 clxscore=1015 bulkscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511140091 On 11/12/2025 4:29 PM, Konrad Dybcio wrote: > On 11/10/25 5:37 PM, Akhil P Oommen wrote: >> Current logic assumes that the voltage corners in both MxG and MxA are >> always same. This is not true for recent targets. So, rework the rpmh init >> sequence to probe and calculate the votes with the respective rails, ie, >> GX rails should use MxG as secondary rail and Cx rail should use MxA as >> the secondary rail. > > Is GMU always on Mx*A* and never Mx*C*? I believe the GMUs we have so far are always on MxA when it is available. -Akhil. > > Konrad