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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b72bf9bc214sm1630778866b.52.2025.11.12.03.26.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 12 Nov 2025 03:26:22 -0800 (PST) Message-ID: <9e8b47d8-9a20-40da-a6eb-cdd167c108dd@oss.qualcomm.com> Date: Wed, 12 Nov 2025 12:26:20 +0100 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: Kamal Wadhwa , Bjorn Andersson , Konrad Dybcio , Liam Girdwood , Mark Brown Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Maulik Shah References: <20251022-add-rpmh-read-support-v2-0-5c7a8e4df601@oss.qualcomm.com> <20251022-add-rpmh-read-support-v2-2-5c7a8e4df601@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20251022-add-rpmh-read-support-v2-2-5c7a8e4df601@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: fP3kjKSMRnALrcBynErj9Y9nv4S8PUaP X-Proofpoint-ORIG-GUID: fP3kjKSMRnALrcBynErj9Y9nv4S8PUaP X-Authority-Analysis: v=2.4 cv=acRsXBot c=1 sm=1 tr=0 ts=69146ee1 cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=l5wVe-rlrMsD3pqKN94A:9 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTEyMDA5MiBTYWx0ZWRfX8efaQSMz+z2Z 7wmYKX74ZDymmRDEuHCFZeFdhReoWm7AmR0fsYogLwQSQMpVoaNNDnVMtTXNIMigUtrhR4x/W9u qjeWKhAiRl0hXcPBOS+1kPQuaMcx72izN98ZhlgbKvcf4R/ffoxMUMQDAu/wYfBNRyH21idbOAQ BpPx/4cZh/sUB93nwYGwRZa6DaFEb5yKD70GJTSws/OWcTt1MiBApmg8Bk5/jITMgZIGvRlYb0F bDqvssFesHmw2KDJJwC62gdr5A/U+M5qKPZJEx0gX3BHab6oTXvT0A8Xige/atxuNH7JkZ2lWKQ Zz9gaLGS4ArJ8ZGmuFCg4IIyTGxbHfT/etN/FSO2lee1HPTBF3H3+DcEkFvE9jFUVwb4erOHCO3 r9ibUiKitnqRTb8Kl/YnkA/1oKzUCw== 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=2025-11-12_03,2025-11-11_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 bulkscore=0 clxscore=1015 spamscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 impostorscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511120092 On 10/21/25 11:08 PM, 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. > > Link: https://lore.kernel.org/r/20250623-add-rpmh-read-support-v1-1-ae583d260195@oss.qualcomm.com > Signed-off-by: Maulik Shah > Signed-off-by: Kamal Wadhwa > --- [...] > +int rpmh_read(const struct device *dev, struct tcs_cmd *cmd) > +{ > + DECLARE_COMPLETION_ONSTACK(compl); > + DEFINE_RPMH_MSG_ONSTACK(dev, RPMH_ACTIVE_ONLY_STATE, &compl, rpm_msg); > + int ret; > + > + ret = __fill_rpmh_msg(&rpm_msg, RPMH_ACTIVE_ONLY_STATE, cmd, 1, true); > + if (ret) > + return ret; > + > + ret = __rpmh_write(dev, RPMH_ACTIVE_ONLY_STATE, &rpm_msg); Is there a reason for making this ACTIVE_ONLY? Konrad