Re: [PATCH 1/1] [PATCH v4 1/1] mmc: Support of DUAL BUFFER DESC[ring] mode for dw_mmc

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On Thu, Nov 3, 2011 at 12:35 PM, Chris Ball <cjb@xxxxxxxxxx> wrote:
> Hi,
>
> On Thu, Nov 03 2011, Shashidhar Hiremath wrote:
>> Hi Chris,
>>   Can this patch be accepted by criteria that its an additional
>> feature supported by the hardware and hence good to have the support
>> in the driver.Also note the patch has been tested.
>
> I think Will and James should make the call on that.
>
> My own opinion is that it's not usually a good idea to merge code that
> increases complexity for no performance gain; if the feature is actually
> important, someone should find a way to finish it and measure a
> performance gain (the gain can be in any of bandwidth, memory, or
> lower CPU utilization) with it, to prove that the change is worthwhile.

I'm inclined to agree. I don't want to feel like I am blocking
inclusion of anyone's hard work, but unless there is a clear advantage
for one option over the other I can't see a good reason for merging
it. At present it adds a question to the Kconfig that is pretty much
impossible for the user to answer (do I turn this feature on or off?
what is the advantage of choosing each option?).
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