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ARM: shmobile: r8a7791: Allow booting secondary CPU cores in debug mode 

Now debug resource reset is handled properly, allow booting secondary
CPU cores when hardware debug mode is enabled (MD21=1, SW8-4=OFF on
koelsch) on legacy r8a7791.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2016-12-05 11:39:40 +01:00 committed by Simon Horman
parent d03c8f78d0
commit 367ed998fa
1 changed files with 1 additions and 13 deletions
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14
arch/arm/mach-shmobile/smp-r8a7791.c
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@ -42,21 +42,9 @@ static void __init r8a7791_smp_prepare_cpus(unsigned int max_cpus)
rcar_gen2_pm_init();
}
static int r8a7791_smp_boot_secondary(unsigned int cpu,
struct task_struct *idle)
{
/* Error out when hardware debug mode is enabled */
if (rcar_gen2_read_mode_pins() & BIT(21)) {
pr_warn("Unable to boot CPU%u when MD21 is set\n", cpu);
return -ENOTSUPP;
}
return shmobile_smp_apmu_boot_secondary(cpu, idle);
}
const struct smp_operations r8a7791_smp_ops __initconst = {
.smp_prepare_cpus = r8a7791_smp_prepare_cpus,
.smp_boot_secondary = r8a7791_smp_boot_secondary,
.smp_boot_secondary = shmobile_smp_apmu_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_can_disable = shmobile_smp_cpu_can_disable,
.cpu_die = shmobile_smp_apmu_cpu_die,