diff options
| -rw-r--r-- | arch/arm/mach-vexpress/platsmp.c | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/arch/arm/mach-vexpress/platsmp.c b/arch/arm/mach-vexpress/platsmp.c index 8b8d0724f6c6..98e29dee91e8 100644 --- a/arch/arm/mach-vexpress/platsmp.c +++ b/arch/arm/mach-vexpress/platsmp.c @@ -26,19 +26,37 @@ bool __init vexpress_smp_init_ops(void) { #ifdef CONFIG_MCPM + int cpu; + struct device_node *cpu_node, *cci_node; + /* - * The best way to detect a multi-cluster configuration at the moment - * is to look for the presence of a CCI in the system. + * The best way to detect a multi-cluster configuration + * is to detect if the kernel can take over CCI ports + * control. Loop over possible CPUs and check if CCI + * port control is available. * Override the default vexpress_smp_ops if so. */ - struct device_node *node; - node = of_find_compatible_node(NULL, NULL, "arm,cci-400"); - if (node && of_device_is_available(node)) { - mcpm_smp_set_ops(); - return true; + for_each_possible_cpu(cpu) { + bool available; + + cpu_node = of_get_cpu_node(cpu, NULL); + if (WARN(!cpu_node, "Missing cpu device node!")) + return false; + + cci_node = of_parse_phandle(cpu_node, "cci-control-port", 0); + available = cci_node && of_device_is_available(cci_node); + of_node_put(cci_node); + of_node_put(cpu_node); + + if (!available) + return false; } -#endif + + mcpm_smp_set_ops(); + return true; +#else return false; +#endif } static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = { |