RE: [PATCH 04/17] powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead of redundant mpic_irq_set_wake

From	Wang Dongsheng <Dongsheng.Wang@freescale.com>
Newsgroups	linux.kernel
Subject	RE: [PATCH 04/17] powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead of redundant mpic_irq_set_wake
Date	2015-09-23 07:40 +0200
Message-ID	<qbKWC-39P-7@gated-at.bofh.it> (permalink)
References	<qbbvQ-2wt-3@gated-at.bofh.it> <qbbvQ-2wt-11@gated-at.bofh.it> <qbI8p-7yS-5@gated-at.bofh.it> <qbI8p-7yS-3@gated-at.bofh.it> <qbJe9-Dl-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw


> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-
> owner@vger.kernel.org] On Behalf Of Thomas Gleixner
> Sent: Wednesday, September 23, 2015 11:49 AM
> To: Wang Dongsheng-B40534
> Cc: Wood Scott-B07421; Sudeep Holla; linux-pm@vger.kernel.org; linux-
> kernel@vger.kernel.org; Rafael J. Wysocki; Benjamin Herrenschmidt; Paul
> Mackerras; Michael Ellerman; Jia Hongtao-B38951; Marc Zyngier; linuxppc-
> dev@lists.ozlabs.org
> Subject: RE: [PATCH 04/17] powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead of
> redundant mpic_irq_set_wake
> 
> On Wed, 23 Sep 2015, Wang Dongsheng wrote:
> > > On Mon, 2015-09-21 at 16:47 +0100, Sudeep Holla wrote:
> > > > mpic_irq_set_wake return -ENXIO for non FSL MPIC and sets IRQF_NO_SUSPEND
> > > > flag for FSL ones. enable_irq_wake already returns -ENXIO if irq_set_wak
> > > > is not implemented. Also there's no need to set the IRQF_NO_SUSPEND flag
> > > > as it doesn't guarantee wakeup for that interrupt.
> > > >
> >
> > Non-freescale return -ENXIO, is there any issue? If non-freescale
> > platform does not support it, but IPs still use
> > enable/disable_irq_wake, we should return a error number.
> 
> You can just set IRQCHIP_SKIP_SET_WAKE for FSL chips and not for the
> others.
> 
> > @Scott:
> > If set this flag we cannot keep a irq as a wakeup source when system going to
> > SUSPEND or MEM.
> >
> > irq_set_wake() means we can set this irq as a wake source.
> > IRQCHIP_SKIP_SET_WAKE is ignore irq_set_wake() feature.
> 
> Nonsense. IRQCHIP_SKIP_SET_WAKE merily tells the core not to bail on
> !chip->irq_set_wake(), but its still marking the interrupt as wakeup
> source and therefor not masking it on suspend.
> 

Sorry, I just check irq_set_irq_wake() code, right, IRQCHIP_SKIP_SET_WAKE also can
going to irqd_set to mask IRQD_WAKEUP_STATE.

Yes, this flag just skip the irq_set_wake() not this feature.

Regards,
-Dongsheng

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Thread

RE: [PATCH 04/17] powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead of  redundant mpic_irq_set_wake Wang Dongsheng <Dongsheng.Wang@freescale.com> - 2015-09-23 04:40 +0200
  RE: [PATCH 04/17] powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead  of redundant mpic_irq_set_wake Thomas Gleixner <tglx@linutronix.de> - 2015-09-23 05:50 +0200
    RE: [PATCH 04/17] powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead of  redundant mpic_irq_set_wake Wang Dongsheng <Dongsheng.Wang@freescale.com> - 2015-09-23 07:40 +0200
      RE: [PATCH 04/17] powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead  of redundant mpic_irq_set_wake Thomas Gleixner <tglx@linutronix.de> - 2015-09-23 10:10 +0200

csiph-web