Hi ALSA ML
I'm thinking below style as new audio-graph-card2. It is not tricky, thus connection judgement for normal vs DSP is easy. Then, code can be more readable (= no guaranty :P) ?
I have proposed DPCM connection idea for audio-card2 before, and proposed Multi-CPU/Codec connection idea later. I'm not yet implemented these, but I want to merge / reuse these idea to keep simple code.
By this mail, I want to propose Codec2Codec idea. It is almost same idea with DPCM, Multi-CPU/Codec, and is last parts for missing feature.
I think this idea can be generic and easy to update in the future (if needed).
But, I want feedback, opinion. I wonder does it works for your use-case ?
-- Image ---
Codec2Codec
Codec1 <--> Codec2
-- DT Image --
+--+ => | |<--> Codec1 | |<--> Codec2 +--+
-- DT Sample --
sound { compatible = "audio-graph-card2";
dais = <&codec2codec>; };
CODEC2CODEC { compatible = "audio-graph-card2-codec2codec";
ports { codec2codec: port@0 { fe_ep: endpoint { remote-endpoint = <&codec1_ep>; }; }; port@1 { be_ep: endpoint { remote-endpoint = <&codec2_ep>; }; }; }; };
Codec1 { port@0 { codec1_ep: endpoint { remote-endpoint = <&fe_ep>; }; }; };
Codec2 { port@0 { codec2_ep: endpoint { remote-endpoint = <&be_ep>; }; }; };
-- Image ---
******* PCM0 <--> * * <--> DAI0: Codec Headset PCM1 <--> * * <--> DAI1: Codec Speakers PCM2 <--> * DSP * <--> DAI2: MODEM PCM3 <--> * * <--> DAI3: BT * * <--> DAI4: DMIC * * <--> DAI5: FM *******
-- DT Image --
+--+ **** +--+ => | |<--> PCM0 * * <-- (dummy) --> | | <= | |<-- (dummy) --> * * DAI0 <--> | | +--+ * * +--+ * * +--+ * * +--+ => | |<--> PCM1 * * <-- (dummy) --> | | <= | |<-- (dummy) --> * * DAI1 <--> | | +--+ * * +--+ ... ... ...
-- DT Sample --
sound { compatible = "audio-graph-card2";
/* indicate all Front-End, Back-End in DPCM case */ dais = <&dsp_fe0, &dsp_fe1, &dsp_fe2, &dsp_fe3, &dsp_be0, &dsp_be1, &dsp_be2, &dsp_be3, &dsp_be4, &dsp_be5>; };
DSP { compatible = "audio-graph-card2-dsp";
ports@0 { /* Front-End is pcm0_ep, Back-End is dummy */ dsp_fe0: port@0 { dsp_fe0_ep: endpoint { remote-endpoint = <&pcm0_ep>; }; }; port@1 { }; };
...
ports@4 { /* Front-End is dummy, Back-End is dai_ep */ dsp_be0: port@0 { }; port@1 { dsp_be0_ep: endpoint { remote-endpoint = <&dai0_ep>; }; }; };
...
};
CPU { ports { port@0 { pcm0_ep: endpoint { remote-endpoint = <&dsp_fe0_ep>; }; }; port@1 { pcm1_ep: endpoint { remote-endpoint = <&dsp_fe1_ep>; }; }; port@2 { pcm2_ep: endpoint { remote-endpoint = <&dsp_fe2_ep>; }; }; port@3 { pcm3_ep: endpoint { remote-endpoint = <&dsp_fe3_ep>; }; }; ... }; };
Codec { ports { port@0 { dai0_ep: endpoint { remote-endpoint = <&dsp_be0_ep>; }; }; port@1 { dai1_ep: endpoint { remote-endpoint = <&dsp_be1_ep>; }; }; port@2 { dai2_ep: endpoint { remote-endpoint = <&dsp_be2_ep>; }; }; port@3 { dai3_ep: endpoint { remote-endpoint = <&dsp_be3_ep>; }; }; port@4 { dai4_ep: endpoint { remote-endpoint = <&dsp_be4_ep>; }; }; port@5 { dai5_ep: endpoint { remote-endpoint = <&dsp_be5_ep>; }; }; ... }; };
-- Image ---
As Sample, Normal Audio-Graph
CPU <---> Codec (Same as before)
-- DT Sample --
sound { compatible = "audio-graph-card2";
dais = <&cpu>; };
CPU { cpu: port { cpu_ep: endpoint { remote-endpoint = <&codec_ep>; }; }; };
Codec { codec: port { codec_ep: endpoint { remote-endpoint = <&cpu_ep>; }; }; };
-- Image ---
Multi-CPU/Codec (complex connection as sample)
<- multi_CPU_0 -> ****** CPU01 <--> * * <--> Codec0 -> * * CPU02 <--> * * ******
<-- multi_codec_1 --> ****** CPU1 <--> * * <--> Codec11 * * <-/ * * <--> Codec12 ******
-- DT Image --
+--+ +--+ => | | <--> CPU01_1 => | | <--> CPU1 | | <--> CPU01_2 | | | | <--> CPU02 | | <--> Codec11_1 | | | | <--> Codec11_2 | | <--> Codec0 | | <--> Codec12 +--+ +--+
-- DT Sample --
sound { compatible = "audio-graph-card2";
dais = <&cpu_0, &cpu_1>; };
MULTI0 { compatible = "audio-graph-card2-multi";
cpu_0: ports@0 { port@0 { fe0_1_ep: endpoint { remote-endpoint = <&cpu01_1_ep>; }; }; port@1 { fe0_2_ep: endpoint { remote-endpoint = <&cpu01_2_ep>; }; }; port@2 { fe0_3_ep: endpoint { remote-endpoint = <&cpu02_ep>; }; }; }; ports@1 { port@0 { be0_ep: endpoint { remote-endpoint = <&codec0_ep>; }; }; }; };
MULTI1 { compatible = "audio-graph-card2-multi";
cpu_1: ports@0 { port@0 { fe1_ep: endpoint { remote-endpoint = <&cpu1_ep>; }; }; }; ports@1 { port@0 { be1_1_ep: endpoint { remote-endpoint = <&codec11_1_ep>; }; }; port@1 { be1_2_ep: endpoint { remote-endpoint = <&codec11_2_ep>; }; }; port@2 { be1_3_ep: endpoint { remote-endpoint = <&codec12_ep>; }; }; }; };
CPU01 { ports { port@0 { cpu01_1_ep: endpoint { remote-endpoint = <&fe0_1_ep>; }; }; port@1 { cpu01_2_ep: endpoint { remote-endpoint = <&fe0_2_ep>; }; }; ... }; };
CPU02 { ports { port@0 { cpu02_ep: endpoint { remote-endpoint = <&fe0_3_ep>; }; }; ... }; };
CPU1 { ports { port@0 { cpu1_ep: endpoint { remote-endpoint = <&fe1_ep>; }; }; ... }; };
Codec0 { ports { port@0 { codec0_ep: endpoint { remote-endpoint = <&be0_ep>; }; }; port@1 { ... }; }; };
Codec11 { ports { port@0 { codec11_1_ep: endpoint { remote-endpoint = <&be1_1_ep>; }; }; port@1 { codec11_2_ep: endpoint { remote-endpoint = <&be1_2_ep>; }; }; port@2 { ... }; }; };
Codec12 { ports { port@0 { codec12_ep: endpoint { remote-endpoint = <&be1_3_ep>; }; }; port@1 { ... }; }; };