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SubjectRe: [PATCH] ASoC: es8316: limit headphone mixer volume
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Hello,

Oops... I got mistake,

> SOC_DOUBLE_TLV("Headphone Mixer Volume", ES8316_HPMIX_VOL,
> 0, 4, 15, 0, hpmixer_gain_tlv),

is wrong,

> SOC_DOUBLE_TLV("Headphone Mixer Volume", ES8316_HPMIX_VOL,
> 0, 4, 11, 0, hpmixer_gain_tlv),

is correct.

Best Regards,
Katsuhiro Suzuki


On 2019/08/26 17:41, Katsuhiro Suzuki wrote:
> Hello Daniel,
>
> On 2019/08/26 11:53, Daniel Drake wrote:
>> On Mon, Aug 26, 2019 at 1:38 AM Hans de Goede <hdegoede@redhat.com>
>> wrote:
>>> On 24-08-19 23:04, Katsuhiro Suzuki wrote:
>>>> This patch limits Headphone mixer volume to 4 from 7.
>>>> Because output sound suddenly becomes very loudly with many noise if
>>>> set volume over 4.
>>
>> That sounds like something that should be limited in UCM.
>>
>>> Higher then 4 not working matches my experience, see this comment from
>>> the UCM file: alsa-lib/src/conf/ucm/codecs/es8316/EnableSeq.conf :
>>>
>>> # Set HP mixer vol to -6 dB (4/7) louder does not work
>>> cset "name='Headphone Mixer Volume' 4"
>>
>> What does "does not work" mean more precisely?
>>
>> I checked the spec, there is indeed something wrong in the kernel
>> driver here.
>> The db scale is not a simple scale as the kernel source suggests.
>>
>> Instead it is:
>> 0000 – -12dB
>> 0001 – -10.5dB
>> 0010 – -9dB
>> 0011 – -7.5dB
>> 0100 – -6dB
>> 1000 – -4.5dB
>> 1001 – -3dB
>> 1010 – -1.5dB
>> 1011 – 0dB
>>
> > So perhaps we can fix the kernel to follow this table and then use UCM
> > to limit the volume if its too high on a given platform?
> >
>
> Thank you very important information. So you mean value 5, 6, 7 are
> illegal settings for ES8316. Correct codes are
>
> static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(hpmixer_gain_tlv,
>     0, 4, TLV_DB_SCALE_ITEM(-1200, 150, 0),
>     8, 11, TLV_DB_SCALE_ITEM(-450, 150, 0),
> );
>
> and...
>
>     SOC_DOUBLE_TLV("Headphone Mixer Volume", ES8316_HPMIX_VOL,
>                0, 4, 15, 0, hpmixer_gain_tlv),
>
> Is my understanding correct? If so I'll test it on my board
> (RockPro64) and re-send patch.
>
> BTW, do you know how to get ES8316 I2C registers spec?
> I want to see it for understanding current code, but I cannot find...
>
>
>> Thanks
>> Daniel
>>
>>
>
> Best Regards,
> Katsuhiro Suzuki
>

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