linux-kernel - Re: [PATCH 03/18] dmaengine: PL08x: Rework LLI handling to be less fragile

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Message-ID: <CACRpkdYYWZppS8pPZKejxe-RCOTkA786+k76gmsrn8jX+6ZP_w@mail.gmail.com>
Date:	Wed, 28 Aug 2013 08:49:28 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-spi@...r.kernel.org, Dan Williams <djbw@...com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Padmavathi Venna <padma.v@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Sangbeom Kim <sbkim73@...sung.com>,
	Takashi Iwai <tiwai@...e.de>, Vinod Koul <vinod.koul@...el.com>
Subject: Re: [PATCH 03/18] dmaengine: PL08x: Rework LLI handling to be less fragile

On Sun, Aug 11, 2013 at 7:59 PM, Tomasz Figa <tomasz.figa@...il.com> wrote:

> Currently memory allocated for LLIs is casted to an array of structs,
> which is fragile and also limits the driver to a single, predefined LLI
> layout, while there are some variants of PL08x, which have more fields
> in LLI (namely PL080S with its extra CCTL2).
>
> This patch makes LLIs a sequence of 32-bit words, which is just filled
> with appropriate values in appropriate order and padded with required
> amount of dummy words (currently zero, but PL080S will make better use
> of this).
>
> Suggested-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>

Yes exactly like this :-)

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij
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