linux-kernel - Re: [PATCHv4 3/7] ARM: EXYNOS: Support secondary CPU boot of Exynos3250

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Date:	Fri, 25 Apr 2014 14:56:37 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Tushar Behera <tushar.behera@...aro.org>
Cc:	kgene.kim@...sung.com, t.figa@...sung.com,
	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	ben-linux@...ff.org, arnd@...db.de, olof@...om.net,
	marc.zyngier@....com, thomas.abraham@...aro.org,
	kyungmin.park@...sung.com, inki.dae@...sung.com,
	sw0312.kim@...sung.com, hyunhee.kim@...sung.com,
	yj44.cho@...sung.com, chanho61.park@...sung.com,
	sajjan.linux@...il.com, sachin.kamat@...aro.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCHv4 3/7] ARM: EXYNOS: Support secondary CPU boot of Exynos3250

Hi,

On 04/25/2014 02:54 PM, Tushar Behera wrote:
> On 04/25/2014 11:13 AM, Chanwoo Choi wrote:
>> Hi,
>>
>> On 04/25/2014 01:30 PM, Tushar Behera wrote:
>>> On 04/25/2014 06:46 AM, Chanwoo Choi wrote:
>>>> This patch fix the offset of CPU boot address and don't need to send smc call
>>>> of SMC_CMD_CPU1BOOT command for secondary CPU boot because Exynos3250 removes
>>>> WFE in secure mode.
>>>>
>>>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>>>> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
>>>> ---
>>>>  arch/arm/mach-exynos/firmware.c | 10 ++++++++--
>>>>  1 file changed, 8 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
>>>> index aa01c42..386d01d 100644
>>>> --- a/arch/arm/mach-exynos/firmware.c
>>>> +++ b/arch/arm/mach-exynos/firmware.c
>>>> @@ -31,11 +31,17 @@ static int exynos_do_idle(void)
>>>>  static int exynos_cpu_boot(int cpu)
>>>>  {
>>>>  	/*
>>>> +	 * Exynos3250 doesn't need to send smc command for secondary CPU boot
>>>> +	 * because Exynos3250 removes WFE in secure mode.
>>>> +	 */
>>>> +	if (soc_is_exynos3250())
>>>> +		return 0;
>>>> +	/*
>>>>  	 * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
>>>>  	 * But, Exynos4212 has only one secondary CPU so second parameter
>>>>  	 * isn't used for informing secure firmware about CPU id.
>>>>  	 */
>>>> -	if (soc_is_exynos4212())
>>>> +	else if (soc_is_exynos4212())
>>>
>>> This changes is not required.
>>
>> Do you mean it as following?
>>
>> 	if (soc_is_exynos3250())
>> 		return 0
>>
>> 	if (soc_is_exynos4212())
>> 		cpu = 0;
>>
> 
> Yes, logically the flow would be same and code would be more readable.

OK, I'll fix it.

Thanks,
Chanwoo Choi

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