linux-kernel - Re: [PATCHv2] DMAEngine: Let dmac drivers to set chan

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Message-ID: <CAJe_ZhfNHQYOvG2_qr3FeZfL-PDmOX2TS9r=2LokoKq=U3UcLQ@mail.gmail.com>
Date:	Thu, 28 Jul 2011 16:26:25 +0530
From:	Jaswinder Singh <jaswinder.singh@...aro.org>
To:	Russell King <rmk@....linux.org.uk>
Cc:	"Koul, Vinod" <vinod.koul@...el.com>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, linus.walleij@...ricsson.com,
	per.friden@...ricsson.com, wei.zhang@...escale.com,
	ebony.zhu@...escale.com, iws@...o.caltech.edu,
	s.hauer@...gutronix.de, maciej.sosnowski@...el.com,
	saeed@...vell.com, shawn.guo@...escale.com, yur@...raft.com,
	agust@...x.de, iwamatsu.nobuhiro@...esas.com,
	per.forlin@...ricsson.com, jonas.aberg@...ricsson.com,
	anemo@....ocn.ne.jp
Subject: Re: [PATCHv2] DMAEngine: Let dmac drivers to set chan_id

On 28 July 2011 02:07, Russell King <rmk@....linux.org.uk> wrote:
> On Wed, Jul 27, 2011 at 08:00:23PM +0530, Jaswinder Singh wrote:
>> On 27 July 2011 14:32, Koul, Vinod <vinod.koul@...el.com> wrote:
>> > You can have two different DMACs in same system. At least I have two
>> > from current intel_mid_dma which are used. Both give their channel id
>> > starting from 0, 1....
>> > Further as we integrate video, audio, spi, emmc dmacs possibility of
>> > having multiple dmacs will increase in a system
>>
>> Most of Samsung's S5P series have 3 DMACs - 2 for peripherals and 1 for
>> mem->mem But that is not the point.
>>
>> This patch in no way affects what values currently a dmac driver
>> assigns to chan_id
>
> Then *explain* how the chan_id is used to match the channel which the
> peripheral requires when you have three DMA controllers, each with
> channels numbered 0 to 7.
>
>> > Sorry I didn't get you.
>> > As I understand you are trying to simplify the filter function by
>> > assigning unique ids to all channels,
>>
>> No dear. Let me put it precisely.
>>
>> Even if we make no further change to the dmaengine, this patch is the right
>> thing to do today.
>
> You sound like a politician.  "the right thing to do" is a cop-out.  That
> says "believe me, I know I'm right, but I can't say why I'm right, I just
> am."  Basically, it means that the person saying it has no clue on the
> subject they're talking about.

Why don't you look at the _patch_ and see if it's correct or not ?
Rather than passing judgement on my character.

>
> If you do have a clue, then don't say that infuriating phrase, but give an
> actual reason.
>
Please look at the first few posts in this thread.
I and Dan have gone through it cleanly enough.
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