merged. Bruce
In message: [linux-yocto][v5.15/standard/intel-sdk-5.15/intel-socfpga & v5.15/standard/preempt-rt/intel-sdk-5.15/intel-socfpga][PATCH 1/1] arm64: psci: don't create online interface file for cpu0 on intel socfpga platform on 21/07/2022 Liwei Song wrote: > From: Meng Li <[email protected]> > > commit 0eee61da3433d22534098984ebdc5b41aebbac4d from > git://git.yoctoproject.org/linux-yocto > v5.10/standard/intel-sdk-5.10/intel-socfpga. > > After upgrading u-boot to v2021.07, it creates the fit bootloader image > that includes atf and u-boot by default. As known, the cpu hardware > off/on action is processed in atf code, but for intel socfpga platform, > system resets when do cpu0 up. So, create this workaround in kernel > code to avoid operating cpu0 off/on interface online file firstly, and > then try to fix the root cause in atf code in later. > > Signed-off-by: Meng Li <[email protected]> > Signed-off-by: Liwei Song <[email protected]> > --- > arch/arm64/kernel/psci.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c > index ab7f4c476104..c5c7d3452aac 100644 > --- a/arch/arm64/kernel/psci.c > +++ b/arch/arm64/kernel/psci.c > @@ -49,7 +49,14 @@ static int cpu_psci_cpu_boot(unsigned int cpu) > #ifdef CONFIG_HOTPLUG_CPU > static bool cpu_psci_cpu_can_disable(unsigned int cpu) > { > - return !psci_tos_resident_on(cpu); > + /* This is a work around for Intel socfpga platforms that don't support > + * for shutting down cpu0. So add the limitation to disable offline > cpu0. > + */ > + if ((of_machine_is_compatible("altr,socfpga-stratix10") || > + of_machine_is_compatible("intel,socfpga-agilex")) && > cpu == 0) > + return false; > + else > + return !psci_tos_resident_on(cpu); > } > > static int cpu_psci_cpu_disable(unsigned int cpu) > -- > 2.36.1 >
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