fix(dwc2): complete periodic IN channels immediately

The core has already halted a periodic IN channel when every packet completes. Report the transfer at that point instead of requesting another halt interrupt, allowing the next service interval to be queued without delay.

Signed-off-by: HiFiPHile <[email protected]>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/portable/synopsys/dwc2/hcd_dwc2.c b/src/portable/synopsys/dwc2/hcd_dwc2.c
index 12918a9f7..7fbefff86 100644
--- a/src/portable/synopsys/dwc2/hcd_dwc2.c
+++ b/src/portable/synopsys/dwc2/hcd_dwc2.c
@@ -950,7 +950,13 @@ static bool handle_channel_in_slave(dwc2_regs_t* dwc2, uint8_t ch_id, uint32_t h
       xfer->result = XFER_RESULT_SUCCESS;
     }
 
-    channel_disable(dwc2, channel);
+    if (channel_is_periodic(channel->hcchar) && remain_packets == 0) {
+      // The core has already halted a completed periodic IN channel. Complete
+      // it now so the next interval can be submitted without another halt IRQ.
+      is_done = true;
+    } else {
+      channel_disable(dwc2, channel);
+    }
   } else if (hcint & (HCINT_XACT_ERR | HCINT_BABBLE_ERR | HCINT_STALL)) {
     if (hcint & HCINT_STALL) {
       xfer->result = XFER_RESULT_STALLED;