[lkml]   [2015]   [Jun]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH v5 2/3] ARM: rockchip: ensure CPU to enter WFI/WFE state
The patch can ensure that v7_exit_coherency_flush() in rockchip_cpu_die()
executed in time.
The mdelay(1) has enough time to fix the problem of CPU offlining.
That's a workaround way in rockchip hotplug code,
At least, we haven't a better way to solve it. Who know,
that maybe fixed by chip (hardware) in the future.

Signed-off-by: Caesar Wang <>

Changes in v5:
- Fix the patch decription.
- Add the changelog.

Changes in v4: None

Changes in v3: None

Changes in v2: None

Changes in v2:
- As Kever points out, Fix the subject typo WFI/WFE.


arch/arm/mach-rockchip/platsmp.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index bd40852..5bc2a89 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -321,6 +321,9 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
static int rockchip_cpu_kill(unsigned int cpu)
+ /* ensure CPU can enter the WFI/WFE state */
+ mdelay(1);
pmu_set_power_domain(0 + cpu, false);
return 1;

 \ /
  Last update: 2015-06-08 09:41    [W:0.070 / U:1.776 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site