[PATCH v5 1/4] ARM: mvebu: add broken-idle option

[gregory.clement@free-electrons.com (Gregory CLEMENT)]

 On lun., oct. 12 2015, Gregory CLEMENT <gregory.clement@free-electrons.com> wrote:

> Hi Simon,
>  
>  On mar., oct. 06 2015, Simon Guinot <simon.guinot@sequanux.org> wrote:
>
>> From: Vincent Donnefort <vdonnefort@gmail.com>
>>
>> The broken-idle option can be activated from the coherency-fabric DT
>> node. This property allows to disable the idle capability, when the
>> hardware doesn't support it, like the Seagate Personal Cloud boards.
>>
>> Signed-off-by: Vincent Donnefort <vdonnefort@gmail.com>
>
> Applied on mvebu/config
Actually on mvebu/soc

>
> Thanks,
>
> Gregory
>> ---
>>  .../devicetree/bindings/arm/coherency-fabric.txt   |  5 ++++
>>  arch/arm/mach-mvebu/pmsu.c                         | 29 +++++++++++++++++++---
>>  2 files changed, 31 insertions(+), 3 deletions(-)
>>
>> Changes for v5:
>> - Make the broken-idle property boolean.
>> - Don't use the broken-idle flag for Armada 38x.
>>
>> diff --git a/Documentation/devicetree/bindings/arm/coherency-fabric.txt b/Documentation/devicetree/bindings/arm/coherency-fabric.txt
>> index 8dd46617c889..9b5c3f620e65 100644
>> --- a/Documentation/devicetree/bindings/arm/coherency-fabric.txt
>> +++ b/Documentation/devicetree/bindings/arm/coherency-fabric.txt
>> @@ -27,6 +27,11 @@ Required properties:
>>   * For "marvell,armada-380-coherency-fabric", only one pair is needed
>>     for the per-CPU fabric registers.
>>  
>> +Optional properties:
>> +
>> +- broken-idle: boolean to set when the Idle mode is not supported by the
>> +  hardware.
>> +
>>  Examples:
>>  
>>  coherency-fabric at d0020200 {
>> diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
>> index e8fdb9ceedf0..cba3fa985734 100644
>> --- a/arch/arm/mach-mvebu/pmsu.c
>> +++ b/arch/arm/mach-mvebu/pmsu.c
>> @@ -379,6 +379,16 @@ static struct notifier_block mvebu_v7_cpu_pm_notifier = {
>>  
>>  static struct platform_device mvebu_v7_cpuidle_device;
>>  
>> +static int broken_idle(struct device_node *np)
>> +{
>> +	if (of_property_read_bool(np, "broken-idle")) {
>> +		pr_warn("CPU idle is currently broken: disabling\n");
>> +		return 0;
>> +	}
>> +
>> +	return 1;
>> +}
>> +
>>  static __init int armada_370_cpuidle_init(void)
>>  {
>>  	struct device_node *np;
>> @@ -387,7 +397,9 @@ static __init int armada_370_cpuidle_init(void)
>>  	np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
>>  	if (!np)
>>  		return -ENODEV;
>> -	of_node_put(np);
>> +
>> +	if (!broken_idle(np))
>> +		goto end;
>>  
>>  	/*
>>  	 * On Armada 370, there is "a slow exit process from the deep
>> @@ -406,6 +418,8 @@ static __init int armada_370_cpuidle_init(void)
>>  	mvebu_v7_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
>>  	mvebu_v7_cpuidle_device.name = "cpuidle-armada-370";
>>  
>> +end:
>> +	of_node_put(np);
>>  	return 0;
>>  }
>>  
>> @@ -422,6 +436,10 @@ static __init int armada_38x_cpuidle_init(void)
>>  				     "marvell,armada-380-coherency-fabric");
>>  	if (!np)
>>  		return -ENODEV;
>> +
>> +	if (!broken_idle(np))
>> +		goto end;
>> +
>>  	of_node_put(np);
>>  
>>  	np = of_find_compatible_node(NULL, NULL,
>> @@ -430,7 +448,6 @@ static __init int armada_38x_cpuidle_init(void)
>>  		return -ENODEV;
>>  	mpsoc_base = of_iomap(np, 0);
>>  	BUG_ON(!mpsoc_base);
>> -	of_node_put(np);
>>  
>>  	/* Set up reset mask when powering down the cpus */
>>  	reg = readl(mpsoc_base + MPCORE_RESET_CTL);
>> @@ -450,6 +467,8 @@ static __init int armada_38x_cpuidle_init(void)
>>  	mvebu_v7_cpuidle_device.dev.platform_data = armada_38x_cpu_suspend;
>>  	mvebu_v7_cpuidle_device.name = "cpuidle-armada-38x";
>>  
>> +end:
>> +	of_node_put(np);
>>  	return 0;
>>  }
>>  
>> @@ -460,12 +479,16 @@ static __init int armada_xp_cpuidle_init(void)
>>  	np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
>>  	if (!np)
>>  		return -ENODEV;
>> -	of_node_put(np);
>> +
>> +	if (!broken_idle(np))
>> +		goto end;
>>  
>>  	mvebu_cpu_resume = armada_370_xp_cpu_resume;
>>  	mvebu_v7_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
>>  	mvebu_v7_cpuidle_device.name = "cpuidle-armada-xp";
>>  
>> +end:
>> +	of_node_put(np);
>>  	return 0;
>>  }
>>  
>> -- 
>> 2.1.4
>>
>
> -- 
> Gregory Clement, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com