[alsa-devel] Cherry Trail + RT5645 devices with a mono speaker ?

[Hans de Goede]

HI,

On 30-10-17 04:29, Bard Liao wrote:
>> -----Original Message-----
>> From: Hans de Goede [mailto:hdegoede at redhat.com]
>> Sent: Friday, October 27, 2017 6:18 PM
>> To: Bard Liao; Pierre-Louis Bossart
>> Cc: alsa-devel at alsa-project.org; Oder Chiou; Shuming [范書銘]; Albert Chen
>> Subject: Re: Cherry Trail + RT5645 devices with a mono speaker ?
>>
>>>>
>>>> On 16-10-17 13:31, Bard Liao wrote:
>>>>>> -----Original Message-----
>>>>>> From: Hans de Goede [mailto:hdegoede at redhat.com]
>>>>>> Sent: Sunday, October 15, 2017 2:12 AM
>>>>>> To: Pierre-Louis Bossart; Bard Liao
>>>>>> Cc: alsa-devel at alsa-project.org
>>>>>> Subject: Cherry Trail + RT5645 devices with a mono speaker ?
>>>>>>
>>>>>> Hi Pierre-Louis, Bard,
>>>>>>
>>>>>> I've been looking into getting some Cherry Trail + RT5645
>>>>>> devices with a mono speaker I have to work properly.
>>>>>>
>>>>>> Specifically the goal is to mix the right channel into
>>>>>> the left output, so that sounds which are only played
>>>>>> over the right channel do not get lost.
>>>>>>
>>>>>> I'm using this UCM file:
>>>>>> https://github.com/plbossart/UCM/blob/master/byt-rt5640/HiFi
>>>>>>
>>>>>> Looking at the rtl5640 UCM file, getting the mono speaker
>>>>>> to work (in a first simple attempt) should be as simple
>>>>>> as replacing:
>>>>>>
>>>>>>                     cset "name='SPOR MIX SPKVOL R Switch' on"
>>>>>>
>>>>>> With
>>>>>>
>>>>>>                     cset "name='SPOL MIX SPKVOL R Switch' on"
>>>>>>
>>>>>> But this does not work, the speaker test sound for the
>>>>>> right speaker is still silent (works with headphones).
>>>>>>
>>>>>> I've also looked into directly poking the
>>>>>> RT5645_SPO_MIXER i2c register for testing, but when
>>>>>> checking its value with the original unmodified UCM
>>>>>> file:
>>>>>>
>>>>>> [root at localhost ~]# i2cget -y -f 1 0x1a 0x48  w
>>>>>> 0x06c8
>>>>>>
>>>>>> That is: 0xc806 as the output of i2cget "w" mode
>>>>>> needs byteswapping. Note that both the
>>>>>> RT5645_M_SV_L_SPM_L and RT5645_M_SV_R_SPM_L bits
>>>>>> are already cleared, which is weird as this is
>>>>>> before I've modified anything. Also the
>>>>>> RT5645_M_SV_R_SPM_R bit is cleared, but that is
>>>>>> expected.
>>>>>>
>>>>>> Even if I manually set reg 0x48 to 0x07c8 which AFAIK
>>>>>> should enable output of both left and right channels
>>>>>> on the left speaker I still only get sounds played
>>>>>> on the left channel.
>>>>>>
>>>>>> Any insights / help with this would be very much
>>>>>> welcome.
>>>>>
> 
> Unfortunately, "SPOL MIX DAC R1 Switch" and "SPOL MIX SPKVOL R Switch"
> are no longer valid. I will send a patch for that. Please use
> "Stereo DAC MIXL DAC R1 Switch" to do L/R channel mix.

Ok, thank you I will give this a try.

Regards,

Hans