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Mon, 20 Nov 2023 09:27:50 -0800 (PST) Received: from [192.168.1.20] ([178.197.222.11]) by smtp.gmail.com with ESMTPSA id k21-20020a7bc415000000b004042dbb8925sm18262046wmi.38.2023.11.20.09.27.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Nov 2023 09:27:49 -0800 (PST) Message-ID: Date: Mon, 20 Nov 2023 18:27:47 +0100 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/3] Implement vendor resets for PSCI SYSTEM_RESET2 Content-Language: en-US To: Elliot Berman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lorenzo Pieralisi , Mark Rutland Cc: Satya Durga Srinivasu Prabhala , Melody Olvera , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Florian Fainelli References: <20231117-arm-psci-system_reset2-vendor-reboots-v1-0-03c4612153e2@quicinc.com> <417cb5cb-01f5-4d01-8bbe-aa2286fca43e@linaro.org> <39b694e9-3275-43b0-a1af-4e2ef7facda3@quicinc.com> From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 20/11/2023 17:03, Elliot Berman wrote: > > > On 11/20/2023 2:55 AM, Krzysztof Kozlowski wrote: >> On 17/11/2023 22:18, Elliot Berman wrote: >>> The PSCI SYSTEM_RESET2 call allows vendor firmware to define additional >>> reset types which could be mapped to the reboot argument. >>> >>> Setting up reboot on Qualcomm devices can be inconsistent from chipset >>> to chipset. Generally, there is a PMIC register that gets written to >>> decide the reboot type. There is also sometimes a cookie that can be >>> written to indicate that the bootloader should behave differently than a >>> regular boot. These knobs evolve over product generations and require >>> more drivers. Qualcomm firmwares are beginning to expose vendor >>> SYSTEM_RESET2 types to simplify driver requirements from Linux. >>> >>> Add support in PSCI to statically wire reboot mode commands from >>> userspace to a vendor reset and cookie value using the device tree. The >>> DT bindings are similar to reboot mode framework except that 2 >>> integers are accepted (the type and cookie). Also, reboot mode framework >>> is intended to program, but not reboot, the host. PSCI SYSTEM_RESET2 >>> does both. I've not added support for reading ACPI tables since I don't >>> have any device which provides them + firmware that supports vendor >>> SYSTEM_RESET2 types. >>> >>> Previous discussions around SYSTEM_RESET2: >>> - https://lore.kernel.org/lkml/20230724223057.1208122-2-quic_eberman@quicinc.com/T/ >>> - https://lore.kernel.org/all/4a679542-b48d-7e11-f33a-63535a5c68cb@quicinc.com/ >> >> Please link here upstream DTS user for this. > > The changes are applicable for SM8650, but hasn't yet landed in arm64/for-next/core. > > I'll include it in the v2 with note. It's enough if you link to lore or any other upstream-oriented tree with that user. Does not have to be merged. Best regards, Krzysztof