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From: mark.rutland@arm.com (Mark Rutland)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v8 2/2] arm-soc: Add support for arm-based tango4 platforms
Date: Mon, 2 Nov 2015 18:26:15 +0000	[thread overview]
Message-ID: <20151102182615.GI2684@leverpostej> (raw)
In-Reply-To: <yw1xfv0o9xr3.fsf@unicorn.mansr.com>

> > +ENTRY(tango_smc)
> > +	push	{lr}
> > +	mov	ip, r1
> > +	dsb
> 
> Did you ever get a straight answer on the dsb here?

We didn't. Having a look just now, the earliest example appears to be
in OMAP4 L2 support patches back in 2009 [1]. I was not able to find a
rationale.

Given that the MMU is on (and speculative accesses are permitted) I
can't see what the DSB achieves -- it can't quiesce the memory system.

Santosh, any idea?

Thanks,
Mark.

> > +	smc	#0
> > +	pop	{pc}
> > +ENDPROC(tango_smc)

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2009-December/005815.html

  parent reply	other threads:[~2015-11-02 18:26 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-02 15:17 [PATCH v8 0/2] Sigma Designs Tango4 port Marc Gonzalez
2015-11-02 15:18 ` [PATCH v8 1/2] arm-soc: Import initial tango4 device tree Marc Gonzalez
2015-11-02 16:01   ` Måns Rullgård
2015-11-02 17:11     ` Marc Gonzalez
2015-11-02 17:59       ` Måns Rullgård
2015-11-03  0:57       ` Måns Rullgård
2015-11-02 20:33   ` Florian Fainelli
2015-11-02 15:19 ` [PATCH v8 2/2] arm-soc: Add support for arm-based tango4 platforms Marc Gonzalez
2015-11-02 16:22   ` Måns Rullgård
2015-11-02 17:33     ` Marc Gonzalez
2015-11-02 18:01       ` Måns Rullgård
2015-11-02 18:26     ` Mark Rutland [this message]
2015-11-02 18:30       ` Måns Rullgård
2015-11-02 18:37       ` santosh shilimkar
2015-11-03  8:34         ` Marc Gonzalez
2015-11-03 10:12           ` Måns Rullgård
2015-11-03 16:37             ` santosh shilimkar
2015-11-03 17:04               ` Marc Gonzalez
2015-11-03 18:02                 ` Måns Rullgård
2015-11-02 15:52 ` [PATCH v8 0/2] Sigma Designs Tango4 port Marc Gonzalez
2015-11-02 21:40 ` Arnd Bergmann
2015-11-03  9:00   ` Marc Gonzalez

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