linux-kernel - Re: [PATCH v3 03/13] pm: at91: Workaround DDRSDRC self-refresh bug with LPDDR1 memories.

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Message-ID: <20150127224325.GR26493@n2100.arm.linux.org.uk>
Date:	Tue, 27 Jan 2015 22:43:25 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Peter Rosin <peda@...ntia.se>
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Wenyou Yang <wenyou.yang@...el.com>,
	"nicolas.ferre@...el.com" <nicolas.ferre@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	"sylvain.rochet@...secur.com" <sylvain.rochet@...secur.com>,
	"linux@...im.org.za" <linux@...im.org.za>
Subject: Re: [PATCH v3 03/13] pm: at91: Workaround DDRSDRC self-refresh bug
 with LPDDR1 memories.

On Tue, Jan 27, 2015 at 09:55:52PM +0000, Peter Rosin wrote:
> I have now checked the assembler output, and apparently it mends the
> input, just as I thought. That might be a fluke, of course, or it might be a
> deliberate shorthand when the destination register is the same as the
> following operand?

I believe it is because we have the assembler in unified asm mode, where
such things are legal (due to Thumb2.)  That means these two are
legal:

	orr	r2, #const
	orr	r2, r2, #const

and equivalent in this context.

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