linux-kernel - Re: [PATCH] mtd: nand: raw: atmel: add module param to avoid using dma

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Message-ID: <024079cb-77ad-9c48-e370-e6e8f2de171b@axentia.se>
Date:   Sun, 27 May 2018 11:18:49 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Josh Wu <rainyfeeling@...look.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-kernel@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        linux-mtd@...ts.infradead.org, Richard Weinberger <richard@....at>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        linux-arm-kernel@...ts.infradead.org,
        Eugen Hristev <eugen.hristev@...rochip.com>
Subject: Re: [PATCH] mtd: nand: raw: atmel: add module param to avoid using
 dma

On 2018-05-25 16:51, Tudor Ambarus wrote:
> We think the best way is to keep LCD on DDR Ports 2 and 3 (8th and 9th
> slaves), to have maximum bandwidth and to use DMA on DDR port 1 for NAND
> (7th slave).

Exactly how do I accomplish that?

I can see how I can move the LCD between slave DDR port 2 and 3 by
selecting LCDC DMA master 8 or 9 (but according to the above it should
not matter). The big question is how I control what slave the NAND flash
is going to use? I find nothing in the datasheet, and the code is also
non-transparent enough for me to figure it out by myself without
throwing out this question first...

Cheers,
Peter