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fix: reserve Classic reconnect airtime with two Switch 2 links

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Joey Yakimowich-Payne 2026-09-07 18:39:30 -06:00
commit ed8f3a7c7f
9 changed files with 74 additions and 44 deletions
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27
ADAPTER_PARITY_PLAN.md
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@ -819,13 +819,26 @@ from 197 host requests without queue drops; the user confirmed both sides.
Normal GATT-client busy responses now retain queued output instead of
disconnecting the controller.
Two Switch 2 BLE links plus Classic now select 30 ms Switch 2 connection
intervals automatically; other topologies retain 7.5 ms. This trades Switch 2
delivery latency for Classic airtime without changing HD encoding or bonds.
Physical DualSense power-off/reconnect verified both interval transitions
without losing the Joy-Con links. A 30-second production mixed-rumble run
kept native DualSense streaming, with no send failures or ingress drops,
14 Joy-Con output-stage discards and nine PCM skips. It is not lossless.
Two or more Switch 2 BLE links now select 30 ms connection intervals even
before Classic connects; a single Switch 2 link retains 7.5 ms. Paired and
Individual Joy-Cons use the same physical-link policy. This trades Switch 2
delivery latency for Classic paging and streaming airtime without changing
HD encoding or bonds. The earlier policy waited for a Classic link and passed
one physical power-off/reconnect check, but subsequent use exposed intermittent
DualSense connection failures with two Joy-Cons already active. Regression
coverage now requires airtime before Classic admission and after its departure.
The user confirmed reconnects and actuator output/clean stops at 30 ms.
A same-workload 15/30 ms comparison at 300 MHz rejected 15 ms for native
haptics: it timed out around four seconds, with 111 PCM sends, 38 skips and
one send failure. At 30 ms the full 30-second run retained all three links
and native streaming: 1,384 PCM sends, 47 skips, no send failures or host-update/
Switch 2 ingress drops, and seven Joy-Con output-stage drops. The isolated
DualSense fixture delivered all 288 packets without skips. Release images keep
30 ms; long-duration reliability remains unqualified. All 349 tests and four
affected firmware builds passed for the preconnection policy.
A prior 30-second production mixed-rumble run kept native DualSense streaming,
with no send failures or ingress drops, 14 Joy-Con output-stage discards and
nine PCM skips. It is not lossless.
The native-HD checkpoint passed 289 tests and all five firmware builds; its
40 pre-existing profiles and metadata survived. Its inventory then contained