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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab384c636b4sm53182266b.15.2025.01.16.13.20.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Jan 2025 13:20:40 -0800 (PST) Message-ID: <56023e4f-d60b-41c3-a3c9-ba768613e9b2@oss.qualcomm.com> Date: Thu, 16 Jan 2025 22:20:38 +0100 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sm8650: setup gpu thermal with higher temperatures To: Akhil P Oommen , Neil Armstrong , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250110-topic-sm8650-thermal-cpu-idle-v2-0-5787ad79abbb@linaro.org> <20250110-topic-sm8650-thermal-cpu-idle-v2-2-5787ad79abbb@linaro.org> <8fc3b958-5c2f-4c79-8dc0-d1eec9f5e47d@quicinc.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <8fc3b958-5c2f-4c79-8dc0-d1eec9f5e47d@quicinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: 7Mz0YC5Rs6258HQh5a6Pd1T07ndcXGls X-Proofpoint-ORIG-GUID: 7Mz0YC5Rs6258HQh5a6Pd1T07ndcXGls X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-16_09,2025-01-16_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 adultscore=0 mlxscore=0 bulkscore=0 impostorscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 lowpriorityscore=0 clxscore=1015 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501160157 On 13.01.2025 11:28 AM, Akhil P Oommen wrote: > On 1/10/2025 4:06 PM, Neil Armstrong wrote: >> On the SM8650, the dynamic clock and voltage scaling (DCVS) for the GPU >> is done in an hardware controlled loop by the GPU Management Unit (GMU). >> >> Since the GMU does a better job at maintaining the GPUs temperature in an >> acceptable range by taking in account more parameters like the die >> characteristics or other internal sensors, it makes no sense to try >> and reproduce a similar set of constraints with the Linux devfreq thermal >> core. > > Just FYI, this description is incorrect. SM8650's GMU doesn't do any > sort of thermal management. What's this for then? Just reacting to thermal pressure? https://git.codelinaro.org/clo/le/platform/vendor/qcom/opensource/graphics-kernel/-/commit/e4387d101d14965c8f2c67e10a6a9499c1a88af4 Konrad