From: santosh.shilimkar@oracle.com (santosh shilimkar)
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 10:37:40 -0800 [thread overview]
Message-ID: <5637AD74.4080206@oracle.com> (raw)
In-Reply-To: <20151102182615.GI2684@leverpostej>
On 11/2/2015 10:26 AM, Mark Rutland wrote:
>>> +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?
>
IIRC, it was requirement from the OMAP ROM code to have a dsb before
we call the SMC routine. I can't recollect more than that now.
Regards,
Santosh
next prev parent reply other threads:[~2015-11-02 18:37 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
2015-11-02 18:30 ` Måns Rullgård
2015-11-02 18:37 ` santosh shilimkar [this message]
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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