Hi,
On 06/02/2015 19:04, Gregory CLEMENT wrote:
> On Armada 38x SoCs, under heavy I/O load, the system hangs when CPU
> Idle is enabled. Waiting for a solution to this issue, this patch
> disables the CPU Idle support for this SoC.
>
> As CPU Hot plug support also uses some of the CPU Idle functions it is
> also affected by the same issue. This patch disables it also for the
> Armada 38x SoCs.
>
If nobody is against it, I plan to apply this patch as a fix for 4.0 in
a couple of days.
Gregory
> Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v3.17 +
> ---
> arch/arm/mach-mvebu/pmsu.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
> index d8ab605a44fa..05c8625bbc40 100644
> --- a/arch/arm/mach-mvebu/pmsu.c
> +++ b/arch/arm/mach-mvebu/pmsu.c
> @@ -476,12 +476,22 @@ static int __init mvebu_v7_cpu_pm_init(void)
> return 0;
> of_node_put(np);
>
> + /*
> + * Currently the CPU Idle support for Armada 38x is broken, as
> + * the CPU Hotplug uses some of the CPU Idle functions it is
> + * broken too, so let's disable it
> + */
> + if (of_machine_is_compatible("marvell,armada380")) {
> + cpu_hotplug_disable();
> + pr_warn("CPU Hotplug support is currently broken on Armada 38x: disabling");
> + }
> +
> if (of_machine_is_compatible("marvell,armadaxp"))
> ret = armada_xp_cpuidle_init();
> else if (of_machine_is_compatible("marvell,armada370"))
> ret = armada_370_cpuidle_init();
> - else if (of_machine_is_compatible("marvell,armada380"))
> - ret = armada_38x_cpuidle_init();
> + else if (of_machine_is_compatible("marvell,armada380")
> + pr_warn("CPU Idle is currently broken on Armada 38x: disabling");
> else
> return 0;
>
>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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