Hello Daniel,
On 2019/08/26 11:53, Daniel Drake wrote:
On Mon, Aug 26, 2019 at 1:38 AM Hans de Goede <hdegoede@xxxxxxxxxx> 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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