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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-63e3f32366csm1099380a12.30.2025.10.23.01.17.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 23 Oct 2025 01:17:30 -0700 (PDT) Message-ID: <5c0b4712-4a54-4a1a-ad73-dc3bdb21a0ff@oss.qualcomm.com> Date: Thu, 23 Oct 2025 10:17:28 +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 v2 2/4] soc: qcom: rpmh: Add support to read back resource settings To: "Maulik Shah (mkshah)" , Bjorn Andersson , Kamal Wadhwa Cc: Konrad Dybcio , Liam Girdwood , Mark Brown , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251022-add-rpmh-read-support-v2-0-5c7a8e4df601@oss.qualcomm.com> <20251022-add-rpmh-read-support-v2-2-5c7a8e4df601@oss.qualcomm.com> <4831d12b-a42a-464a-a70f-e0e40cf4ae4b@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <4831d12b-a42a-464a-a70f-e0e40cf4ae4b@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDE4MDAwMCBTYWx0ZWRfXxKF8wEEUSI/Z 9duJj8ynM14eUXvQzYvvZuIVDQPUYpFSsYtdJv6jqDppubMm+wGK3PEY9Een+KMdl2nIghS7NYz abqedZ4Lk7uEt19M2bPTeBG6F8cmLPc1oFnC3mt3YiCMEMtIcumL1lP0nnGCSS0kNeCH/cC8AmR 84zuwo7oiUgMhJtz3m/1/GabSe0tjFSnhr7uukHyugCIZ8TkmuenSf3orRUBoaygtPi/hHAB2fG sF0/w7zlxk2aCmoUA0iG+87IhktrT7uJGLQfchX2zG15+d4YF8IJrI3a6eXDLghHQ2vKUPb2USF BDhzO/sA7Y6HIYdeH47ZeCgMsIxgNExyK8/dszt34sX+mx9E+Clrn4MlDtzwe2NrY90WfewcXEq pl+wqFljqI/O3ZLF6zIJrA8DdN+evA== X-Proofpoint-GUID: qJ0Bfr5hWgCLyoL5tN1f1fRO8_ZZELQw X-Authority-Analysis: v=2.4 cv=Up1u9uwB c=1 sm=1 tr=0 ts=68f9e49c cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=ECcW57WI63K3aF9AT9UA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 X-Proofpoint-ORIG-GUID: qJ0Bfr5hWgCLyoL5tN1f1fRO8_ZZELQw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-22_08,2025-10-22_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 suspectscore=0 malwarescore=0 clxscore=1015 impostorscore=0 bulkscore=0 priorityscore=1501 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510180000 On 10/23/25 6:46 AM, Maulik Shah (mkshah) wrote: > > > On 10/23/2025 2:51 AM, Bjorn Andersson wrote: >> On Wed, Oct 22, 2025 at 02:38:54AM +0530, Kamal Wadhwa wrote: >>> From: Maulik Shah >>> >>> All rpmh_*() APIs so far have supported placing votes for various >>> resource settings but the H/W also have option to read resource >>> settings. >>> >>> This change adds a new rpmh_read() API to allow clients >>> to read back resource setting from H/W. This will be useful for >>> clients like regulators, which currently don't have a way to know >>> the settings applied during bootloader stage. >>> >> >> Allow me to express my disappointment over the fact that you sat on this >> for 7 years! > > This was a dead API (even in downstream) with no user since SDM845/ 7 years. > Read support was eventually removed from downstream driver too for the same reason. > There were early discussions to remove read support from RSC H/W, due to lack of users. > Its not realized yet and all SoCs still supports read. Can we read BCM states from HLOS this way too? Konrad