Commit 73053d97 authored by Rob Herring's avatar Rob Herring Committed by Olof Johansson
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ARM: highbank: fix cache flush ordering for cpu hotplug

The L1 data cache flush needs to be after highbank_set_cpu_jump call which
pollutes the cache with the l2x0_lock. This causes other cores to deadlock
waiting for the l2x0_lock. Moving the flush of the entire data cache after
highbank_set_cpu_jump fixes the problem. Use flush_cache_louis instead of
flush_cache_all are that is sufficient to flush only the L1 data cache.
flush_cache_louis did not exist when highbank_cpu_die was originally

With PL310 errata 769419 enabled, a wmb is inserted into idle which takes
the l2x0_lock. This makes the problem much more easily hit and causes
reset to hang.
Reported-by: default avatarPaolo Pisati <>
Signed-off-by: default avatarRob Herring <>
Signed-off-by: default avatarOlof Johansson <>
parent 71bd98af
......@@ -28,13 +28,11 @@ extern void secondary_startup(void);
void __ref highbank_cpu_die(unsigned int cpu)
highbank_set_cpu_jump(cpu, phys_to_virt(0));
/* We should never return from idle */
panic("highbank: cpu %d unexpectedly exit from shutdown\n", cpu);
while (1)
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