[PATCH 0/4] Broadcom STB PM PSCI extensions
Florian Fainelli
f.fainelli at gmail.com
Wed Jan 26 19:55:09 PST 2022
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
More information about the linux-arm-kernel
mailing list