linux-kernel - Re: [PATCH] mtd: onenand: omap2: Simplify the DMA setup for various paths

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Date:	Fri, 18 Dec 2015 21:48:09 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Brian Norris <computersforpeace@...il.com>
CC:	<kyungmin.park@...sung.com>, <dwmw2@...radead.org>,
	<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] mtd: onenand: omap2: Simplify the DMA setup for various
 paths

On 12/18/2015 08:11 PM, Brian Norris wrote:
> On Mon, Dec 14, 2015 at 11:49:32AM +0200, Peter Ujfalusi wrote:
>> We have 4 functions containing almost identical DMA setup code. Create one
>> function which can set up the DMA for both read and write and use this in
>> place for the setup code in the driver.
>> The new function will use wait_for_completion_timeout() and it will figure
>> out the best data_type to be used for the transfer instead of hardwiring
>> 32 or 16 bit data.
>>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> 
> Does anyone use this driver? I've seen practically zero activity on the
> entire OneNAND codebase in the last few years, and I presumed it was
> essentially dead.
> 
> If it's not dead, I'd like to know some contingency of people who are
> willing to actually maintain (or at least review) this stuff.
> 
> Kyungmin, are you still out there? Or Tony, do you know of any users for
> this?
> 
> Peter, are you actually using this, or are you just refactoring for the
> fun of it?

Not really for fun, but I want to get rid of all legacy/direct sDMA use so at
the end we will have omap_start_dma() visible in two files:
arch/arm/plat-omap/dma.c
drivers/dma/omap-dma.c

from there it will be possible to get rid of the plat-omap code. This onenand
driver was the first in the 'git grep omap_start_dma' result ;)

-- 
Péter
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