linux-kernel - Re: [PATCH] ASoC: Add support for NAU8824 codec to ASoC

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Message-ID: <5514811D.1060901@nuvoton.com>
Date:	Thu, 26 Mar 2015 14:58:53 -0700
From:	Chih-Chiang Chang <ccchang12@...oton.com>
To:	Mark Brown <broonie@...nel.org>
CC:	"mcuos.com@...il.com" <mcuos.com@...il.com>,
	"tiwai@...e.de" <tiwai@...e.de>,
	AP MS30 Linux ALSA <alsa-devel@...a-project.org>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	AP MS30 Linux Kernel community 
	<linux-kernel@...r.kernel.org>,
	"liam.r.girdwood@...el.com" <liam.r.girdwood@...el.com>,
	<ccchang12@...oton.com>
Subject: Re: [PATCH] ASoC: Add support for NAU8824 codec to ASoC

Hi Mark,

Sorry late to the response.

On 3/6/2015 1:07 PM, Mark Brown wrote:
> On Fri, Mar 06, 2015 at 03:28:33PM +0800, Chih-Chiang Chang wrote:
>
> Please fix your mailer to word wrap within paragraphs, it makes things a
> lot easier to read.
This seems to violate the kernel's rule. I am using the Thunderbird to
do upstream. And in kernel's documentation, it shows we should set
"mailnews.wraplength" from "72" to "0". Any way, for your convenience, I
already modify the "mailnews.wraplength" back to "72".
>
>> On 2015/3/4 下午 08:55, Mark Brown wrote:
>>> On Wed, Mar 04, 2015 at 08:35:52PM +0800, Chih-Chiang Chang wrote:
>>>> On 2015/2/24 下午 10:13, Mark Brown wrote:
>>> Add relevant control types if you need them, it's important to have
>>> proper stereo controls available to userspace.
>> We cannot find suitable macro in file "include\sound\soc.h", so we want to add below two macro for our chip.
>> SOC_DOUBLE_L_R_VALUE
>> SOC_DOUBLE_L_R_TLV
> Sounds good.
>
>>>>> This looks like you're reimplementing regmap's register sequence
>>>>> stuff...  It's also a *very* large sequence you have, are you sure it's
>>>>> all required?  It seems like this may be doing a bunch of machine
>>>>> specific configuration but since it's all magic numbers it's hard to
>>>>> tell.
>>>> Initial settings are arranged in order
>>> This doesn't answer or address my concern.
>> These large number of register setting is used to initial our codec,
>> and some of other codec have the same behavior. We will remove few
>> unnecessary register default setting and add some remark for
>> registers.
> I'd really like to have a better understanding of what this is doing -
> it can be valid to do this but there are some warning signs here such as
> the volume of writes being large in comparison with the set of controls
> the driver exposes which mean I'd like to be sure the use matches
> expectations.  Normally this sort of thing is a small number of fixes
> for undocumented registers or updates to register defaults changed in
> later revisions of the chip.
We have tried to reduce the sequence recently, but it got some issues in
the tests. We think these large number of register settings are
necessary to our NAU8824 codec. We will provide the comments of all
values in source to have a better understanding, is it acceptable to you?
>
>>> Don't include noise like this in upstream communication, if your company
>>> won't fix this then please use an external mail account for upstream
>>> communication.
>> Our MIS report they have disabled to append message in mail. Hope you do not see it in this mail.
> It's gone, thanks.

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