[alsa-devel] WM5102 - Help to make baytrail machine driver work

[Pierre-Louis Bossart]

On 5/9/17 9:45 AM, Paulo Sergio wrote:
>>>> How are you setting up the I2S? As in which side is master, what
>>>> format are you using? Also do you see any over/underflow error,
>>>> does the system complain with "Error playing sample".
>>>
>>>
>>> The only part where I2S is explicity used on machine driver is this
>>> setting on backend DAI (SSP0-Codec)
>>>
>>> dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
>>> | SND_SOC_DAIFMT_CBS_CFS,
>>>
>>> And after setting the routes using routes mentioned on [3], I have no
>>> errors, but no sound
>>>
>>> Note: Based on Lenovo code, I concluded this device uses ssp0, so I'm
>>> using a fw file "fw_sst_0f28_ssp0.bin" posted another thread.
>>> Could use the hacks used on kernel 4.11, but as I'm still testing with
>>> kernel 4.4, using this fw would make things easier
>>
>>
>> nope. I don't know how many issues we've fixed since 4.4 but it's not a
>> matter of just swapping out one firmware with another. You'll have better
>> luck with plain vanilla 4.11 + regular firmware and restarting modifying one
>> of the latest machine drivers.
>
> Ok, I'll use 4.11 and post the results later
>
> Should I have any special care about I2S other than setting the format
> um backend DAI?
> Some module should be loaded?

Things to look for
- SSP routing: has to be SSP0 on baytrail-CR
- number of slots: 2 or 4. if 4 then use DSP mode
- DAI format
- MCLK

If I can get my hands on a WM5102 eval board I might be able to help 
with a MinnowMax board.