Hi Alex,
On 17 August 2016 at 22:00, Alexander Graf agraf@suse.de wrote:
Am 18.08.2016 um 05:44 schrieb Simon Glass sjg@chromium.org:
Hi Alex,
On 16 August 2016 at 13:08, Alexander Graf agraf@suse.de wrote: Most armv8 systems have PSCI support enabled in EL3, either through ARM Trusted Firmware or other firmware.
On these systems, we do not need to implement system reset manually, but can instead rely on higher level firmware to deal with it.
The exclude list seems excessive right now, but NXP is working on providing an in-tree PSCI implementation, so that all NXP systems can eventually use PSCI as well.
Signed-off-by: Alexander Graf agraf@suse.de
arch/arm/cpu/armv8/Kconfig | 18 ++++++++++++++++++ arch/arm/cpu/armv8/fwcall.c | 7 +++++++ arch/arm/mach-meson/board.c | 5 ----- board/xilinx/zynqmp/zynqmp.c | 5 ----- 4 files changed, 25 insertions(+), 10 deletions(-)
Reviewed-by: Simon Glass sjg@chromium.org
diff --git a/arch/arm/cpu/armv8/Kconfig b/arch/arm/cpu/armv8/Kconfig index 7e1fc4c..cd2d9bb 100644 --- a/arch/arm/cpu/armv8/Kconfig +++ b/arch/arm/cpu/armv8/Kconfig @@ -21,4 +21,22 @@ config ARMV8_SPIN_TABLE - Reserve the code for the spin-table and the release address via a /memreserve/ region in the Device Tree.
+config PSCI_RESET
bool "Use PSCI for reset and shutdown"default ydepends on !ARCH_EXYNOS7 && !ARCH_BCM283X && !TARGET_LS2080A_EMU && \!TARGET_LS2080A_SIMU && !TARGET_LS2080AQDS && \!TARGET_LS2080ARDB && !TARGET_LS1012AQDS && \!TARGET_LS1012ARDB && !TARGET_LS1012AFRDM && \!TARGET_LS1043ARDB && !ARCH_UNIPHIER && !ARCH_SNAPDRAGON && \!TARGET_S32V234EVBWill this break new systems that are added?
I would word it differently - it will gently push new systems into the right direction ;). With PSCI available, Linux SMP will "just work" too.
The worst that can happen is that someone enables a nee system which does not provide PSCI. In that case we have non-working reboot and shutdown handlers. The alternative would be no reboot and shutdown handlers (which is a fatal panic on Linux for example), so we're not worse off imho.
Sounds good.
Regards, Simon