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([2a01:e0a:cad:2140:9a4:ec5a:4022:b507]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-475dcff9101sm71964205e9.1.2025.10.27.07.38.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Oct 2025 07:38:22 -0700 (PDT) Message-ID: <7656e8f6-e281-4f7b-9ff4-1b2722234091@linaro.org> Date: Mon, 27 Oct 2025 15:38:21 +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 Reply-To: Neil Armstrong Subject: Re: [PATCH v2 2/4] soc: qcom: rpmh: Add support to read back resource settings To: Konrad Dybcio , "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> <5c0b4712-4a54-4a1a-ad73-dc3bdb21a0ff@oss.qualcomm.com> <9a227c15-dc60-4086-8d81-f80e3398a083@oss.qualcomm.com> <18e8d5db-e32a-4893-9d1f-5003670cedeb@oss.qualcomm.com> From: Neil Armstrong Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <18e8d5db-e32a-4893-9d1f-5003670cedeb@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/27/25 14:29, Konrad Dybcio wrote: > On 10/23/25 11:46 AM, Maulik Shah (mkshah) wrote: >> >> >> On 10/23/2025 2:39 PM, Konrad Dybcio wrote: >>> On 10/23/25 10:57 AM, Maulik Shah (mkshah) wrote: >>>> >>>> >>>> On 10/23/2025 1:47 PM, Konrad Dybcio wrote: >>>>> 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? >>>> >>>> Yes, Any of ARC/BCM/VRM can be read to get HLOS/DRV2 votes. >>> >>> Wow this is amazing.. >>> >>> Do you have code for this already, or should I hack on it? >> >> No, it won't be of much help, as i said above it gets HLOS/DRV2 votes only for a given resource. >> More specifically, the read does not give the aggregated vote result across all the DRVs. > > Hm, perhaps it could still be of *some* use > > But maybe reading back rpmhpd and rpmhcc states would be of more > use! The interconnect core definitely supports reading back the state at boot. Neil > > Konrad