linux-kernel - Re: [PATCH v10 7/7] ACPI : enable ACPI_PROCESSOR

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Date:	Fri, 29 Jul 2016 15:05:02 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Sudeep Holla <sudeep.holla@....com>,
	ACPI List <linux-acpi@...r.kernel.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>
Cc:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Prashanth Prakash <pprakash@...eaurora.org>,
	Al Stone <al.stone@...aro.org>,
	Vikas Sajjan <vikas.cha.sajjan@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	ALKML <linux-arm-kernel@...ts.infradead.org>,
	Sunil <sunil.vl@....com>
Subject: Re: [PATCH v10 7/7] ACPI : enable ACPI_PROCESSOR_IDLE on ARM64

Hi Sudeep,

On 07/19/2016 01:52 PM, Sudeep Holla wrote:
> Now that ACPI processor idle driver supports LPI(Low Power Idle), lets
> enable ACPI_PROCESSOR_IDLE for ARM64 too.
> 
> This patch just removes the IA64 and X86 dependency on ACPI_PROCESSOR_IDLE
> 
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  drivers/acpi/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 1358fb7d7a68..d74275c0f374 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -238,7 +238,7 @@ config ACPI_CPPC_LIB
>  config ACPI_PROCESSOR
>  	tristate "Processor"
>  	depends on X86 || IA64 || ARM64
> -	select ACPI_PROCESSOR_IDLE if X86 || IA64
> +	select ACPI_PROCESSOR_IDLE
>  	select ACPI_CPU_FREQ_PSS if X86 || IA64
>  	default y
>  	help
> 

This causes a boot hang on QDF2432. cpuidle.off=1 works around the
problem. I understand you're working on a fix to the problem in GICv3
code. If there's anything I can do to help, please let me know.

Thanks,
Christopher Covington

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