linux-kernel - Re: [PATCH] ARM: edma: Fix configuration parsing for SoCs with multiple eDMA3 CC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <53E877BA.6040705@ti.com>
Date:	Mon, 11 Aug 2014 10:58:50 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Vinod Koul <vinod.koul@...el.com>
CC:	<nsekhar@...com>, <linux@....linux.org.uk>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>
Subject: Re: [PATCH] ARM: edma: Fix configuration parsing for SoCs with multiple
 eDMA3 CC

On 08/05/2014 07:32 PM, Vinod Koul wrote:
> On Mon, Aug 04, 2014 at 03:26:56PM +0300, Peter Ujfalusi wrote:
>> The edma_setup_from_hw() should know about the CC number when parsing the
>> CCCFG register - when it reads the register to be precise. The base
>> addresses for CCs stored in an array and we need to provide the correct id
>> to edma_read() in order to read the correct register.
> 
> Just an othognal question:
> 
> I still see lot of code for edma in arm/. What is the plan to re/move that
> to dma/

Yes, there's still a big split. The code under arch/arm/common/ provides still
the 'legacy' edma API. This is still used by audio
sound/soc/davinci/davinci-pcm for older daVinci devices (AM335x. AM43xx uses
the edma-pcm).

And it is not that simple to deprecate davinci-pcm: it can use so called
ping-pong mode for audio data transfer. This mode is not possible via
dmaengine AFAIK.
I'm going to check if edma-pcm would work fine instead of the ping-pong mode.
If it does I can remove davinci-pcm and we can start cleaning up the edma code.

-- 
Péter
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/