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Commit 548ae94c authored by Gregory CLEMENT's avatar Gregory CLEMENT
Browse files

ARM: mvebu: Disable CPU Idle on Armada 38x 



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.

Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: <stable@vger.kernel.org> # v3.17 +
parent c517d838

arch/arm/mach-mvebu/pmsu.c

+15 −1
Original line number Diff line number Diff line
@@ -415,6 +415,9 @@ static __init int armada_38x_cpuidle_init(void) 
	void __iomem *mpsoc_base;

	u32 reg;



	pr_warn("CPU idle is currently broken on Armada 38x: disabling");

	return 0;



	np = of_find_compatible_node(NULL, NULL,

				     "marvell,armada-380-coherency-fabric");

	if (!np)
@@ -476,6 +479,16 @@ 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"))
@@ -489,6 +502,7 @@ static int __init mvebu_v7_cpu_pm_init(void) 
		return ret;



	mvebu_v7_pmsu_enable_l2_powerdown_onidle();

	if (mvebu_v7_cpuidle_device.name)

		platform_device_register(&mvebu_v7_cpuidle_device);

	cpu_pm_register_notifier(&mvebu_v7_cpu_pm_notifier);