linux-kernel - Re: [PATCH v2 1/5] ARM: OMAP2+: DRA7: clockdomain: change l4per2_7xx_clkdm to SW

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Date:	Wed, 15 Jul 2015 20:27:16 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Vignesh R <vigneshr@...com>
cc:	Tero Kristo <t-kristo@...com>,
	Thierry Reding <thierry.reding@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>, linux-pwm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 1/5] ARM: OMAP2+: DRA7: clockdomain: change l4per2_7xx_clkdm
 to SW_WKUP

On Wed, 15 Jul 2015, Paul Walmsley wrote:

> On Wed, 3 Jun 2015, Vignesh R wrote:
> 
> > Legacy IPs like PWMSS, present under l4per2_7xx_clkdm, cannot support
> > smart-idle when its clock domain is in HW_AUTO on DRA7 SoCs. Hence,
> > program clock domain to SW_WKUP.
> > 
> > Signed-off-by: Vignesh R <vigneshr@...com>
> > ---
> >  arch/arm/mach-omap2/clockdomains7xx_data.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm/mach-omap2/clockdomains7xx_data.c b/arch/arm/mach-omap2/clockdomains7xx_data.c
> > index 57d5df0c1fbd..7581e036bda6 100644
> > --- a/arch/arm/mach-omap2/clockdomains7xx_data.c
> > +++ b/arch/arm/mach-omap2/clockdomains7xx_data.c
> > @@ -331,7 +331,7 @@ static struct clockdomain l4per2_7xx_clkdm = {
> >  	.dep_bit	  = DRA7XX_L4PER2_STATDEP_SHIFT,
> >  	.wkdep_srcs	  = l4per2_wkup_sleep_deps,
> >  	.sleepdep_srcs	  = l4per2_wkup_sleep_deps,
> > -	.flags		  = CLKDM_CAN_HWSUP_SWSUP,
> > +	.flags		  = CLKDM_CAN_SWSUP,
> >  };
> >  
> >  static struct clockdomain mpu0_7xx_clkdm = {
> 
> Thanks, queued for v4.2-rc fixes.  Note that I cannot test this, since I 
> don't have a DRA7xx board.

You know, upon further thought, this doesn't make sense.  If the bug
is with the PWMSS IP block specifically, why not just set 
HWMOD_SWSUP_SIDLE on all the IP blocks where the hardware folks didn't 
implement hardware smart-idle?  At least that way, if those legacy IP 
blocks aren't in use, the clockdomain can still enter hardware-supervised 
idle?

This patch basically disables hardware-supervised/smart idle for all of 
the IP blocks in that clockdomain?


- Paul
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