linux-kernel - Re: [PATCH v5 3/5] powerpc/85xx: add sleep and deep sleep support

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Date:	Mon, 4 Jun 2012 17:58:38 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Zhao Chenhui <chenhui.zhao@...escale.com>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<galak@...nel.crashing.org>, <leoli@...escale.com>
Subject: Re: [PATCH v5 3/5] powerpc/85xx: add sleep and deep sleep support

On 06/04/2012 06:12 AM, Zhao Chenhui wrote:
> On Fri, Jun 01, 2012 at 04:54:35PM -0500, Scott Wood wrote:
>> On 05/11/2012 06:53 AM, Zhao Chenhui wrote:
>>> diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h
>>> index 94ec20a..baa000c 100644
>>> --- a/arch/powerpc/include/asm/cacheflush.h
>>> +++ b/arch/powerpc/include/asm/cacheflush.h
>>> @@ -33,6 +33,11 @@ extern void flush_dcache_page(struct page *page);
>>>  #if defined(CONFIG_FSL_BOOKE) || defined(CONFIG_6xx)
>>>  extern void __flush_disable_L1(void);
>>>  #endif
>>> +#if defined(CONFIG_FSL_BOOKE)
>>> +extern void flush_dcache_L1(void);
>>> +#else
>>> +#define flush_dcache_L1()	do { } while (0)
>>> +#endif
>>
>> It doesn't seem right to no-op this on other platforms.
> 
> The pmc_suspend_enter() in fsl_pmc.c used by mpc85xx and mpc86xx,
> but flush_dcache_L1() have no definition in mpc86xx platform.
> I will write flush_dcache_L1() for mpc86xx platform.

How about only calling the function when it's needed?  If we didn't need
an L1 flush here on 86xx before, why do we need it now?

>>>  extern void __flush_icache_range(unsigned long, unsigned long);
>>>  static inline void flush_icache_range(unsigned long start, unsigned long stop)
>>> diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
>>> index f5808a3..cb70dba 100644
>>> --- a/arch/powerpc/kernel/Makefile
>>> +++ b/arch/powerpc/kernel/Makefile
>>> @@ -64,6 +64,9 @@ obj-$(CONFIG_FA_DUMP)		+= fadump.o
>>>  ifeq ($(CONFIG_PPC32),y)
>>>  obj-$(CONFIG_E500)		+= idle_e500.o
>>>  endif
>>> +ifneq ($(CONFIG_PPC_E500MC),y)
>>> +obj-$(CONFIG_PPC_85xx)		+= l2cache_85xx.o
>>> +endif
>>
>> Can we introduce a symbol that specifically means pre-e500mc e500,
>> rather than using negative logic?
>>
>> I think something like CONFIG_PPC_E500_V1_V2 has been proposed before.
> 
> Agree. But CONFIG_PPC_E500_V1_V2 haven't been merged.

Has the concept been NACKed, or just forgotten?  If the latter, you
could include it in this patchset.

-Scott

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