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From: Scott Wood <scottwood@freescale.com>
To: Zhao Chenhui-B35336 <chenhui.zhao@freescale.com>
Cc: "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Jin Zhengxiong-R64188" <Jason.Jin@freescale.com>
Subject: Re: [2/4] powerpc/rcpm: add RCPM driver
Date: Thu, 2 Apr 2015 10:50:50 -0500	[thread overview]
Message-ID: <1427989850.22867.266.camel@freescale.com> (raw)
In-Reply-To: <1427970805609.21194@freescale.com>

On Thu, 2015-04-02 at 05:33 -0500, Zhao Chenhui-B35336 wrote:
> > +static int rcpm_v2_plat_enter_state(int state)
> > +{
> > +     u32 *pmcsr_reg = &rcpm_v2_regs->powmgtcsr;
> > +     int ret = 0;
> > +     int result;
> > +
> > +     switch (state) {
> > +     case PLAT_PM_LPM20:
> > +             /* clear previous LPM20 status */
> > +             setbits32(pmcsr_reg, RCPM_POWMGTCSR_P_LPM20_ST);
> 
> How would the bit be set when you enter here, given that you wait for it
> to clear when leaving?
> 
> [chenhui] Actually, the bit is not used by software. Just follow the instruction in RM.

Sorry, I missed the "_P_" and thought it was RCPM_POWMGTCSR_LPM20_ST.

-Scott



  reply	other threads:[~2015-04-02 15:51 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-26 10:18 [PATCH 1/4] powerpc/cache: add cache flush operation for various e500 Chenhui Zhao
2015-03-26 10:18 ` [PATCH 2/4] powerpc/rcpm: add RCPM driver Chenhui Zhao
2015-03-31  1:30   ` [2/4] " Scott Wood
2015-04-02 10:33     ` chenhui.zhao
2015-04-02 15:50       ` Scott Wood [this message]
2015-03-26 10:18 ` [PATCH 3/4] powerpc: support CPU hotplug for e500mc, e5500 and e6500 Chenhui Zhao
2015-03-31  2:07   ` [3/4] " Scott Wood
2015-04-02 11:16     ` chenhui.zhao
2015-04-02 16:03       ` Scott Wood
2015-04-03  2:54         ` chenhui.zhao
2015-03-26 10:18 ` [PATCH 4/4] powerpc/85xx: support sleep feature on QorIQ SoCs with RCPM Chenhui Zhao
2015-03-31  2:35   ` [4/4] " Scott Wood
2015-04-02 11:18     ` chenhui.zhao
2015-03-31  1:10 ` [1/4] powerpc/cache: add cache flush operation for various e500 Scott Wood
2015-04-02 10:14   ` chenhui.zhao

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