On 2020-02-12 06:43, Srinivas Kandagatla wrote:
On 12/02/2020 11:01, Adam Serbinski wrote:
+
+ - qcom,pcm-slot-mapping
+ Usage: required for pcm interface
Are these not specific to 8k and 16k mode ?
We should probably list values for both modes here.
No, this is just the offset that the audio sample is placed in with
respect to a maximum of 4 slots, 16 bits wide, beginning with the sync
pulse.
That's not true atleast by the QDSP documentation,
according to it we will use more slots to transfer at higher sample
rate. ex:
16 kHz data can be transferred using 8 kHz samples in two
slots.
Also there are 32 slots for each of 4 supported channels for PCM AFE
port.
Ok, if that's the case, then it sounds like someone else is going to
have to implement it. I have no way to test that kind of a
configuration, so attempting to implement it would be futile.
When switching between 8 and 16k sample rate, it is just the sync
pulse rate that is changed. The audio sample will be delivered in the
same slot, just at a different frequency.
