diff options
| -rw-r--r-- | arch/arm/mach-vexpress/platsmp.c | 34 | ||||
| -rw-r--r-- | drivers/bus/arm-cci.c | 10 |
2 files changed, 36 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 = { diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c index 890082315054..231633328dfa 100644 --- a/drivers/bus/arm-cci.c +++ b/drivers/bus/arm-cci.c @@ -2190,6 +2190,9 @@ static int cci_probe_ports(struct device_node *np) if (!of_match_node(arm_cci_ctrl_if_matches, cp)) continue; + if (!of_device_is_available(cp)) + continue; + i = nb_ace + nb_ace_lite; if (i >= nb_cci_ports) @@ -2232,6 +2235,13 @@ static int cci_probe_ports(struct device_node *np) ports[i].dn = cp; } + /* + * If there is no CCI port that is under kernel control + * return early and report probe status. + */ + if (!nb_ace && !nb_ace_lite) + return -ENODEV; + /* initialize a stashed array of ACE ports to speed-up look-up */ cci_ace_init_ports(); |