From: Florian Fainelli <f.fainelli@gmail.com> To: linux-arm-kernel@lists.infradead.org Cc: Florian Fainelli <f.fainelli@gmail.com>, bcm-kernel-feedback-list@broadcom.com (maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE), Mark Rutland <mark.rutland@arm.com>, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, linux-kernel@vger.kernel.org (open list) Subject: [PATCH 0/4] Broadcom STB PM PSCI extensions Date: Fri, 21 Jan 2022 19:54:17 -0800 [thread overview] Message-ID: <20220122035421.4086618-1-f.fainelli@gmail.com> (raw) 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. 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 -- 2.25.1
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From: Florian Fainelli <f.fainelli@gmail.com> To: linux-arm-kernel@lists.infradead.org Cc: Florian Fainelli <f.fainelli@gmail.com>, bcm-kernel-feedback-list@broadcom.com (maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE), Mark Rutland <mark.rutland@arm.com>, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, linux-kernel@vger.kernel.org (open list) Subject: [PATCH 0/4] Broadcom STB PM PSCI extensions Date: Fri, 21 Jan 2022 19:54:17 -0800 [thread overview] Message-ID: <20220122035421.4086618-1-f.fainelli@gmail.com> (raw) 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. 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 -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2022-01-22 3:54 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-01-22 3:54 Florian Fainelli [this message] 2022-01-22 3:54 ` [PATCH 0/4] Broadcom STB PM PSCI extensions Florian Fainelli 2022-01-22 3:54 ` [PATCH 1/4] firmware: psci: Export a couple of suspend symbols Florian Fainelli 2022-01-22 3:54 ` Florian Fainelli 2022-01-22 12:22 ` kernel test robot 2022-01-22 12:22 ` kernel test robot 2022-01-22 3:54 ` [PATCH 2/4] soc: bcm: brcmstb: Make legacy PM code depend on !ARM_PSCI_FW Florian Fainelli 2022-01-22 3:54 ` Florian Fainelli 2022-01-22 3:54 ` [PATCH 3/4] soc: bcm: brcmstb: Added support for PSCI system suspend operations Florian Fainelli 2022-01-22 3:54 ` Florian Fainelli 2022-01-22 6:09 ` kernel test robot 2022-01-22 6:09 ` kernel test robot 2022-01-22 7:10 ` kernel test robot 2022-01-22 7:10 ` kernel test robot 2022-02-03 12:09 ` Mark Rutland 2022-02-03 12:09 ` Mark Rutland 2022-02-03 18:45 ` Florian Fainelli 2022-02-03 18:45 ` Florian Fainelli 2022-01-22 3:54 ` [PATCH 4/4] Documentation: ABI: Document Broadcom STB PSCI firmware files Florian Fainelli 2022-01-22 3:54 ` Florian Fainelli 2022-01-27 3:55 ` [PATCH 0/4] Broadcom STB PM PSCI extensions Florian Fainelli 2022-01-27 3:55 ` Florian Fainelli 2022-02-03 10:47 ` Mark Rutland 2022-02-03 10:47 ` Mark Rutland 2022-02-03 18:32 ` Florian Fainelli 2022-02-03 18:32 ` Florian Fainelli 2022-02-03 11:14 ` Sudeep Holla 2022-02-03 11:14 ` Sudeep Holla 2022-02-03 17:36 ` Florian Fainelli 2022-02-03 17:36 ` Florian Fainelli 2022-02-03 18:52 ` Sudeep Holla 2022-02-03 18:52 ` Sudeep Holla 2022-02-03 19:33 ` Florian Fainelli 2022-02-03 19:33 ` Florian Fainelli 2022-02-07 16:27 ` Sudeep Holla 2022-02-07 16:27 ` Sudeep Holla 2022-02-14 18:12 ` Florian Fainelli 2022-02-14 18:12 ` Florian Fainelli
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