linux-kernel - Re: [PATCH 06/18] dmaengine/amba-pl08x: Simplify pl08x_ensure

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Message-ID: <CAKnu2MoHSVae6N=CA-zi3CpaqOrEOqbPCL=orfs5zgxAUOmSnQ@mail.gmail.com>
Date:	Sun, 31 Jul 2011 00:36:14 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	vinod.koul@...el.com, dan.j.williams@...el.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux@....linux.org.uk, armando.visconti@...com,
	shiraz.hashim@...com, vipin.kumar@...com, rajeev-dlh.kumar@...com,
	deepak.sikri@...com, vipulkumar.samar@...com, amit.virdi@...com,
	pratyush.anand@...com, bhupesh.sharma@...com,
	viresh.linux@...il.com
Subject: Re: [PATCH 06/18] dmaengine/amba-pl08x: Simplify pl08x_ensure_on()

2011/7/29 Viresh Kumar <viresh.kumar@...com>:

> Simply writing 1 on bit 0 is sufficient instead of reading and clearing bits.
> Also as per manual, for bit 3-31 of DMACConfiguration register:
> "read undefined, write as 0"
>
> So, we must not rely on values read from this registers bit 3-31.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@...com>

Obviously correct,
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Thanks,
Linus Walleij
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