[alsa-devel] Help with wm8731 support for the Utilite (imx6q)

[Jonathan Bennett]

On Wed, Oct 22, 2014 at 3:04 AM, Valentin Raevsky <valentin at compulab.co.il>
wrote:

> On 10/22/2014 01:37 AM, Jonathan Bennett wrote:
>
>>
>>
>> On Tue, Oct 21, 2014 at 1:49 PM, Jonathan Bennett <jbscience87 at gmail.com
>> <mailto:jbscience87 at gmail.com>> wrote:
>>
>>
>>
>>     On Tue, Oct 21, 2014 at 1:12 PM, Fabio Estevam <festevam at gmail.com
>>     <mailto:festevam at gmail.com>> wrote:
>>
>>         On Tue, Oct 21, 2014 at 4:04 PM, Jonathan Bennett
>>         <jbscience87 at gmail.com <mailto:jbscience87 at gmail.com>> wrote:
>>
>>         > I realized something just last night. I was grabbing changes
>> from the devel
>>         > branch ofgithub.com/utilite-computer
>>         <http://github.com/utilite-computer>, thinking that those
>>         changes were
>>         > based off the vanilla 3.10 kernel. Those changes are actually
>> based on the
>>         > Freescale 3.10 kernel. I pulled a Freescale patch that is
>> obviously missing:
>>         > "ENGR00276249-1 ARM: imx6q: Add missing baud clock for ssi" I
>> also switched
>>
>>         The baud clock patch is present in 3.18-rc1:
>>
>>         commit 935632e9938e3e286b9c62a7e54d35c428533cc9
>>         Author: Shengjiu Wang <shengjiu.wang at freescale.com
>>         <mailto:shengjiu.wang at freescale.com>>
>>         Date:   Tue Sep 9 17:13:26 2014 +0800
>>
>>              ARM: dts: imx6qdl: add baud clock and clock-names for ssi
>>
>>              Baud clock is used for bit clock generation in master mode.
>>         Ipg clock
>>              is peripheral clock and peripheral access clock.
>>
>>              Signed-off-by: Shengjiu Wang <shengjiu.wang at freescale.com
>>         <mailto:shengjiu.wang at freescale.com>>
>>              Signed-off-by: Shawn Guo <shawn.guo at freescale.c
>>
>>       Awesome!
>>     It's great to see this stuff go mainline.
>>
>>
>> I have rebased to 3.18 rc-1. It has simplified the patch set a bit, as
>> more of  the Freescale things have hit mainline.
>> http://pastebin.com/C652GKe3 is my patchset.
>> Again, the card registers and thinks it plays, but there is no actual
>> output.
>>
> Make sure that "Output Mixer HiFi Playback Switch" is on
> Issue:
> # amixer cset numid=14,iface=MIXER,name='Output Mixer HiFi Playback
> Switch' on
> # alsactl store wm8731audio
>
 BRILLIANT!!!
We've got sound. Thank you for the answer.
Questions:
First, what is the best way to set that to on by default? I know "alsactl
store wm8731audio" Makes it survive reboots. On a fresh install, though,
that should probably default to on.

Second: I would love to see support for this get mainlined. Should I go
back and try to get simple-audio-card working, or stick with the compulab
glue driver?



>
>>
>>         > back to imx-wm8731.c for the driver. With this setup, the
>> driver registers,
>>         > and speaker-test thinks it plays, however there is no actual
>> sound output. I
>>         > call it progress.
>>
>>         Great progress: some things to check :
>>
>>         1. audmux settings
>>
>>     Well, the imx-wm8731 driver (It's really just glue for loading
>>     wm8731) does have audmux settings in it. These get called during the
>>     module probe. Not sure what might need to change there. My thoughts
>>     are that they should be correct.
>>
>>
>>         2. Can you try to run 'alsamixer' and make sure that the volume
>>         is not
>>         at the lowest level?
>>
>>     Yeah, I've made sure to check alsamixer and turn the volume up.
>>     Still no joy.
>>
>>
>>
>