linux-kernel - Re: [PATCH 34/39] dmaengine: ste_dma40: Convert data

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Message-ID: <CACRpkdZ6bijvD1S+YL2W+8R_DVGrmPshiMVigg7iK4zen8r57g@mail.gmail.com>
Date:	Thu, 30 May 2013 11:01:27 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Vinod Koul <vinod.koul@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>,
	Dan Williams <djbw@...com>,
	Per Forlin <per.forlin@...ricsson.com>,
	Rabin Vincent <rabin@....in>
Subject: Re: [PATCH 34/39] dmaengine: ste_dma40: Convert data_width from
 register bit format to value

On Wed, May 15, 2013 at 11:51 AM, Lee Jones <lee.jones@...aro.org> wrote:

> When a DMA client requests and configures a DMA channel, it requests
> data_width in Bytes. The DMA40 driver then swiftly converts it over to
> the necessary register bit value. Unfortunately, for any subsequent
> calculations we have to shift '1' by the bit pattern (1 << data_width)
> times to make any sense of it.
>
> This patch flips the semantics on its head and only converts the value
> to its respective register bit pattern when writing to registers. This
> way we can use the true data_width (in Bytes) value.
>
> Cc: Vinod Koul <vinod.koul@...el.com>
> Cc: Dan Williams <djbw@...com>
> Cc: Per Forlin <per.forlin@...ricsson.com>
> Cc: Rabin Vincent <rabin@....in>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

Patch applied with what I interpret as Vinod's ACK
("okay..." statement on last reply.)

Yours,
Linus Walleij
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