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topology2: document HDA backend ID assignments #11445

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23 changes: 23 additions & 0 deletions tools/topology/topology2/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -276,6 +276,29 @@ default ID ranges for the same endpoint types.
| Deep Buffer | 31 | `DEEP_BUFFER_PCM_ID` |
| Compress HDA Analog | 50 | `COMPR_PCM_ID` |

**Intel HDA Backend DAI Link IDs:**

These IDs match the fixed backend DAI-link IDs defined by the kernel machine
driver. They are independent of PCM IDs and pipeline indexes. The kernel defines
base IDs for iDisp HDMI, HDA, and UAOL. The HDA helper increments the iDisp and
HDA base IDs when it creates additional links; UAOL stream backends also use
consecutive IDs.

| Backend | DAI Link ID | Kernel Define | Topology Variable |
|---|---:|---|---|
| iDisp HDMI 1 | 1 | `IDISP_HDMI_BE_ID` | `HDMI1_ID` |
| iDisp HDMI 2 | 2 | `IDISP_HDMI_BE_ID + 1` | `HDMI2_ID` |
| iDisp HDMI 3 | 3 | `IDISP_HDMI_BE_ID + 2` | `HDMI3_ID` |
| HDA Analog | 4 | `HDA_BE_ID` | Hard-coded as `id 4` |
| HDA Digital | 5 | `HDA_BE_ID + 1` | — |
| DMIC01 | 6 | `DMIC01_BE_ID` | `DMIC0_ID` |
| DMIC 16 kHz | 7 | `DMIC16K_BE_ID` | `DMIC1_ID` |
| Bluetooth Offload | 8 | `BT_OFFLOAD_BE_ID` | Not used by HDA generic |
| UAOL Play0 | 9 | `UAOL_BE_ID` | `UAOL_PB_BE_ID` |
| UAOL Cap0 | 10 | `UAOL_BE_ID + 1` | `UAOL_CP_BE_ID` |
| UAOL Play1 | 11 | `UAOL_BE_ID + 2` | `UAOL_PB1_BE_ID` |
| UAOL Cap1 | 12 | `UAOL_BE_ID + 3` | `UAOL_CP1_BE_ID` |

Key rules:

* PCM ID 0 is always the primary playback endpoint
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