linux-kernel - RE: [PATCH 08/12] pm: at91: rename file name: pm_slowclock.S -->pm

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Date:	Mon, 26 Jan 2015 01:25:13 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Sylvain Rochet <sylvain.rochet@...secur.com>
CC:	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	"peda@...ntia.se" <peda@...ntia.se>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 08/12] pm: at91: rename file name: pm_slowclock.S
 -->pm_suspend.S

Hi Sylvain,

Thank you for your review.

> -----Original Message-----
> From: Sylvain Rochet [mailto:sylvain.rochet@...secur.com]
> Sent: Saturday, January 24, 2015 3:17 AM
> To: Yang, Wenyou
> Cc: Ferre, Nicolas; linux@....linux.org.uk; linux-kernel@...r.kernel.org;
> alexandre.belloni@...e-electrons.com; peda@...ntia.se; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: [PATCH 08/12] pm: at91: rename file name: pm_slowclock.S --
> >pm_suspend.S
> 
> Hello Wenyou,
> 
> On Tue, Jan 20, 2015 at 04:17:01PM +0800, Wenyou Yang wrote:
> >
> > diff --git a/arch/arm/mach-at91/pm_suspend.S
> > b/arch/arm/mach-at91/pm_suspend.S new file mode 100644 index
> > 0000000..420e730
> > --- /dev/null
> 
> 
> > +	/* Turn off the main oscillator */
> > +	ldr	tmp1, [pmc, #AT91_CKGR_MOR]
> > +	bic	tmp1, tmp1, #AT91_PMC_MOSCEN
> 
> at91sam9x5 and probably others need a key here:
> 	orr     tmp1, tmp1, #AT91_PMC_KEY
> 
Yes, I am preparing the patches to support other SoCs.

> > +	str	tmp1, [pmc, #AT91_CKGR_MOR]
> 
> 
> 
> > +	/* Wait for interrupt */
> > +	mcr	p15, 0, tmp1, c7, c0, 4
> 
> The linux-3.10-at91 branch uses a different approach which seem necessary for
> newer board, you probably forget to merge the following:
> 
> /*
>  * Put the processor to enter into Standby mode, wait for interrupt to wakeup  */
> 	.macro _do_wfi
> 
> #if defined(CONFIG_CPU_V7)
> 	dsb
> 
> 	/* Disable the processor clock */
> 	mov	tmp1, #AT91_PMC_PCK
> 	str	tmp1, [pmc, #AT91_PMC_SCDR]
> 
> 	wfi		@ Wait For Interrupt
> #else
> 	mcr	p15, 0, tmp1, c7, c0, 4
> #endif
> 
> 	.endm
> 
> 	.text
> 
I will send the new patch serials to support it in this week. Thanks.

> ENTRY(at91_slow_clock)
> (...)
> 	/* Wait for interrupt */
> 	_do_wfi
> (...)
> 
> 
> 
> 
> > +	/* Turn on the main oscillator */
> > +	ldr	tmp1, [pmc, #AT91_CKGR_MOR]
> > +	orr	tmp1, tmp1, #AT91_PMC_MOSCEN
> 
> at91sam9x5 and probably others need a key here:
>         orr     tmp1, tmp1, #AT91_PMC_KEY
> 
> > +	str	tmp1, [pmc, #AT91_CKGR_MOR]
> 
> 
> 
> What about the following parts which are also in linux-3.10-at91 branch but not in
> this rework, are they necessary ?
Yes, they are necessary, I will send the next patch serial in this week.

> 
> sdr_sr_done:
> 	/* Disable MPDDRC Clock*/
> 	cmp	ddrcid, #0
> 	beq	2f
> 	bic	tmp2, ddrcid, #0xe0 /* fetch lowest 5 bits */
> 	mov	tmp1, #0x01
> 	mov	tmp1, tmp1, lsl tmp2
> 
> 	tst	ddrcid, #0x20	/* > 32 ? */
> 	beq	1f
> 	str	tmp1, [pmc, #AT91_PMC_PCDR1]
> 	b	2f
> 1:
> 	str	tmp1, [pmc, #AT91_PMC_PCDR]
> 2:
> 
> 	/* Disable DDR Clock */
> 	mov 	tmp1, #AT91_PMC_SYS_DDR
> 	str	tmp1, [pmc, #AT91_PMC_SCDR]
> 
> 
> 
> 
> 	/* Enable MPDDRC Clock*/
> 	cmp	ddrcid, #0
> 	beq	4f
> 	bic	tmp2, ddrcid, #0xe0 /* fetch lowest 5 bits */
> 	mov	tmp1, #0x01
> 	mov	tmp1, tmp1, lsl tmp2
> 
> 	tst	ddrcid, #0x20	/* > 32 ? */
> 	beq	3f
> 	str	tmp1, [pmc, #AT91_PMC_PCER1]
> 	b	4f
> 3:
> 	str	tmp1, [pmc, #AT91_PMC_PCER]
> 4:
> 
> 	/* Enable DDR clock */
> 	mov 	tmp1, #AT91_PMC_SYS_DDR
> 	str	tmp1, [pmc, #AT91_PMC_SCER]
> 
> 
> 
> Sylvain

Best Regards,
Wenyou Yang