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[72.194.116.95]) by smtp.gmail.com with ESMTPSA id z13sm237264pfh.45.2022.01.26.19.55.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Jan 2022 19:55:10 -0800 (PST) Message-ID: Date: Wed, 26 Jan 2022 19:55:09 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH 0/4] Broadcom STB PM PSCI extensions Content-Language: en-US To: linux-arm-kernel@lists.infradead.org Cc: "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" , Mark Rutland , Lorenzo Pieralisi , open list References: <20220122035421.4086618-1-f.fainelli@gmail.com> From: Florian Fainelli In-Reply-To: <20220122035421.4086618-1-f.fainelli@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/21/2022 7:54 PM, Florian Fainelli wrote: > Hi all, > > This patch series contains the Broadcom STB PSCI extensions which adds > some additional functions on top of the existing standard PSCI interface > which is the reason for having the driver implement a custom > suspend_ops. > > These platforms have traditionally supported a mode that is akin to > ACPI's S2 with the CPU in WFI and all of the chip being clock gated > which is entered with "echo standby > /sys/power/state". Additional a > true suspend to DRAM as defined in ACPI by S3 is implemented with "echo > mem > /sys/power/state". > > These platforms also may have an external Broadcom PMIC chip which can > cause the SoC to be powercycled assuming that we communicate that intent > via a vendor specific PSCI SYSTEM_RESET2. > > Since it is desirable to get any new functionality added to the kernel > to be loadable as a module as part of shipping said products in a Google > Kernel Image (GKI) environment, we need to export a couple of symbols from > drivers/firmware/psci/psci.c. > > Thanks for your feedback. I will be sending a v2 addressing the kbuild robot failures reported but would prefer to get some feedback first so it can be addressed simultaneously. Thanks! > > Florian Fainelli (4): > firmware: psci: Export a couple of suspend symbols > soc: bcm: brcmstb: Make legacy PM code depend on !ARM_PSCI_FW > soc: bcm: brcmstb: Added support for PSCI system suspend operations > Documentation: ABI: Document Broadcom STB PSCI firmware files > > .../ABI/testing/sysfs-firmware-brcmstb | 16 + > drivers/firmware/psci/psci.c | 9 +- > drivers/soc/bcm/brcmstb/Kconfig | 4 +- > drivers/soc/bcm/brcmstb/pm/Makefile | 3 + > drivers/soc/bcm/brcmstb/pm/pm-psci.c | 315 ++++++++++++++++++ > include/linux/psci.h | 2 + > include/linux/soc/brcmstb/brcmstb-smccc.h | 84 +++++ > 7 files changed, 430 insertions(+), 3 deletions(-) > create mode 100644 Documentation/ABI/testing/sysfs-firmware-brcmstb > create mode 100644 drivers/soc/bcm/brcmstb/pm/pm-psci.c > create mode 100644 include/linux/soc/brcmstb/brcmstb-smccc.h > -- Florian