about ALC203 linux driver

about ALC203 linux driver

[Wan ZongShun]

Hi all,

At present, there is a ALC203 AC97 codec in my Winbond ARM board, and
I am programming
the audio driver based on ALSA, Who can tell me whether the current
ALSA is supporting
the ALC203 driver?how to enable it?

Thanks!

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[alsa-devel] about ALC203 linux driver

[Mark Brown]

On Sun, May 09, 2010 at 10:40:07PM +0800, Wan ZongShun wrote:

> At present, there is a ALC203 AC97 codec in my Winbond ARM board, and
> I am programming
> the audio driver based on ALSA, Who can tell me whether the current
> ALSA is supporting
> the ALC203 driver?how to enable it?

You need a driver for the AC97 controller your system is using (for most
ARM systems this is part of the CPU).  Since AC97 provides a standard
register interface for CODECs Linux does not require specific support
for individual AC97 CODECs in order to get core functionality working.

You can check if there's any specific CODEC support in sound/pci/ac97.

[alsa-devel] about ALC203 linux driver

[Wan ZongShun]

Dear Mark,


2010/5/9 Mark Brown <broonie@opensource.wolfsonmicro.com>:
> On Sun, May 09, 2010 at 10:40:07PM +0800, Wan ZongShun wrote:
>
>> At present, there is a ALC203 AC97 codec in my Winbond ARM board, and
>> I am programming
>> the audio driver based on ALSA, Who can tell me whether the current
>> ALSA is supporting
>> the ALC203 driver?how to enable it?
>
> You need a driver for the AC97 controller your system is using (for most
> ARM systems this is part of the CPU). ?Since AC97 provides a standard
> register interface for CODECs Linux does not require specific support
> for individual AC97 CODECs in order to get core functionality working.
>

There is AC97 support for my chip, and I have implemented the nuc900_ac97.c
,nuc900_pcm.c and machine board c file drivers.The three main
structure definitions
as following:

static struct snd_soc_dai_link nuc900evb_ac97_dai = {
	.name		= "AC97",
	.stream_name	= "AC97 HiFi",
	.cpu_dai	= &nuc900_ac97_dai,
	.codec_dai	= &ac97_dai,
};

static struct snd_soc_card nuc900evb_audio_machine = {
	.name		= "NUC900EVB_AC97",
	.dai_link	= &nuc900evb_ac97_dai,
	.num_links	= 1,
	.platform	= &nuc900_soc_platform,
};

static struct snd_soc_device nuc900evb_ac97_devdata = {
	.card		= &nuc900evb_audio_machine,
	.codec_dev	= &soc_codec_dev_ac97,
};

here, I used the file named ac97.c which is located in
linux-2.6\sound\soc\codecs.
I am sure that it can call the '\sound\pci\ac97ac97_codec.c' file and
identify the
ALC203 (like the log file shows 'nuc900 AC'97 codec is  ALC203',but sometimes
the return value by reading one AC97 register, which is not same as
the writing value to the
AC97 register, that is not my expected result, but sometimes they are same.

any suggestions?



> You can check if there's any specific CODEC support in sound/pci/ac97.
>



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[alsa-devel] about ALC203 linux driver

[Mark Brown]

On Sun, May 09, 2010 at 11:34:28PM +0800, Wan ZongShun wrote:

> here, I used the file named ac97.c which is located in
> linux-2.6\sound\soc\codecs.
> I am sure that it can call the '\sound\pci\ac97ac97_codec.c' file and
> identify the
> ALC203 (like the log file shows 'nuc900 AC'97 codec is  ALC203',but sometimes
> the return value by reading one AC97 register, which is not same as
> the writing value to the
> AC97 register, that is not my expected result, but sometimes they are same.

> any suggestions?

Not all AC97 registers are writable so check that you're writing to
registers that the CODEC supports writing to but in general you're going
to need to debug your controller driver here.  Make sure you're
interacting well with any cache the controller has and that you are
properly synchronising with the controller during reads (which are
fairly slow operations on AC97).

Also make sure that the CODEC is properly clocked.

[alsa-devel] about ALC203 linux driver

[Vincent Wan]

Dear Mark,



Thanks for your help, and I think that is a true direction.

I will re-check my driver as soon as I come back to home.



Wan.



-----Original Message-----
From: Mark Brown [mailto:broonie at opensource.wolfsonmicro.com]
Sent: 2010?5?10? 1:52
To: Wan ZongShun
Cc: Vincent Wan; alsa-devel at alsa-project.org; linux-arm-kernel
Subject: Re: [alsa-devel] about ALC203 linux driver



On Sun, May 09, 2010 at 11:34:28PM +0800, Wan ZongShun wrote:



> here, I used the file named ac97.c which is located in

> linux-2.6\sound\soc\codecs.

> I am sure that it can call the '\sound\pci\ac97ac97_codec.c' file and

> identify the

> ALC203 (like the log file shows 'nuc900 AC'97 codec is  ALC203',but sometimes

> the return value by reading one AC97 register, which is not same as

> the writing value to the

> AC97 register, that is not my expected result, but sometimes they are same.



> any suggestions?



Not all AC97 registers are writable so check that you're writing to

registers that the CODEC supports writing to but in general you're going

to need to debug your controller driver here.  Make sure you're

interacting well with any cache the controller has and that you are

properly synchronising with the controller during reads (which are

fairly slow operations on AC97).



Also make sure that the CODEC is properly clocked.
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[alsa-devel] about ALC203 linux driver

[Ben Dooks]

On Sun, May 09, 2010 at 11:34:28PM +0800, Wan ZongShun wrote:
> Dear Mark,
> 
> 
> 2010/5/9 Mark Brown <broonie@opensource.wolfsonmicro.com>:
> > On Sun, May 09, 2010 at 10:40:07PM +0800, Wan ZongShun wrote:
> >
> >> At present, there is a ALC203 AC97 codec in my Winbond ARM board, and
> >> I am programming
> >> the audio driver based on ALSA, Who can tell me whether the current
> >> ALSA is supporting
> >> the ALC203 driver?how to enable it?
> >
> > You need a driver for the AC97 controller your system is using (for most
> > ARM systems this is part of the CPU). ?Since AC97 provides a standard
> > register interface for CODECs Linux does not require specific support
> > for individual AC97 CODECs in order to get core functionality working.
> >
> 
> There is AC97 support for my chip, and I have implemented the nuc900_ac97.c
> ,nuc900_pcm.c and machine board c file drivers.The three main
> structure definitions
> as following:

does you SoC require any other configurations in other blocks that
may aslo affect this, such as gpio configuratioon for the ac97 pins or
some sort of clock setup?

-- 
Ben

Q:      What's a light-year?
A:      One-third less calories than a regular year.