linux-kernel - Re: [PATCH v2] PL330: Add PL330 DMA controller driver

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Date:	Fri, 26 Mar 2010 10:01:49 +0900
From:	jassi brar <jassisinghbrar@...il.com>
To:	Joonyoung Shim <jy0922.shim@...sung.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>
Subject: Re: [PATCH v2] PL330: Add PL330 DMA controller driver

On Fri, Mar 26, 2010 at 9:54 AM, Joonyoung Shim <jy0922.shim@...sung.com> wrote:
> On 3/26/2010 7:27 AM, jassi brar wrote:
>> On Fri, Mar 26, 2010 at 12:13 AM, Dan Williams <dan.j.williams@...el.com> wrote:
>>> jassi brar wrote:
>>>>> Perhaps Joonyoung can simply port over the stuff
>>>>> you need to this driver if you show your code.
>>>> Having worked on Samsung SoCs(with PL330 DMAC) based products, I would be
>>>> _very_ surprised if any user found this implementation useful.
>>>> Let alone testing, this implementation can't even explain usability
>>>> for fast peripherals
>>>> with shallow FIFOs. I didn't give feedback for this patch because I am
>>>> not sure if this
>>>> is the right way to go at all.
>>> This is the wrong attitude. 혻If it were not for a simple oversight
>>> Joonyoung's driver would already be upstream for the past two kernel
>>> releases. 혻So you need to work together to improve that driver to
>>> incorporate what you need.
>> Nothing wrong in attitude here.
>> Giving feedback on the code only comes after one is convinced with the
>> overall approach taken. The last time I raised the PL330 driver issue,
>> most people were not enthusiastic with this drivers/dma/ approach.
>> I wasn't active mainline discussions when the driver was originally
>> submitted a few months ago.
>> And now my replies are not very 'polite' because theres a lot going on
>> in the background that people in public threads don't know about.
>>
>>
>>> It sounds like you just need to add an extension for the arch specific dma
>>> api.
>> I actually plan more than that.
>> Apart from inefficient design, JoonYoung's driver has made some fatal
>> assumptions
>> about PL330, which will result in DMA aborts if used with SoCs that implement
>> configuration of PL330 that is very different from Samsung SoCs'
>> Of course, I address all such issues that I can think of, in my implementation.
>>
>
> I can wait your implementation and wonder what is the issue also.
>
> I welcome you try other design and want better driver is committed at
> mainline kernel too.
Good to have you at last reply to my posts
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