diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/portable/chipidea/ci_fs/hcd_ci_fs.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/portable/chipidea/ci_fs/hcd_ci_fs.c b/src/portable/chipidea/ci_fs/hcd_ci_fs.c index 44a68a8d6..5c5d81521 100644 --- a/src/portable/chipidea/ci_fs/hcd_ci_fs.c +++ b/src/portable/chipidea/ci_fs/hcd_ci_fs.c @@ -331,6 +331,16 @@ static void process_tokdne(uint8_t rhport) } _hcd.in_progress &= ~TU_BIT(pipenum); pipe_state_t *pipe = &_hcd.pipe[ep->pipenum]; + /* A multi-packet transfer speculatively arms the sibling (odd^1) BDT (see + * prepare_packets) to ping-pong without NAKs. When it ends early (a short IN packet) + * or fails, that sibling is still owned by the SIE; since the host shares a single + * BDT set across all pipes, a leftover armed sibling blocks every other pipe forever + * (e.g. a 2nd device stuck enumerating behind a hub). Release it - but ONLY for a + * multi-packet transfer: a single-packet transfer never armed a sibling, so that + * BDT slot may legitimately belong to another pipe's in-flight transfer. */ + if (pipe->length > pipe->max_packet_size) { + ((buffer_descriptor_t *)&_hcd.bda[s ^ USB_STAT_ODD_MASK])->own = 0; + } hcd_event_xfer_complete(pipe->dev_addr, tu_edpt_addr(CI_REG->TOKEN & USB_TOKEN_TOKENENDPT_MASK, dir_in), pipe->length - pipe->remaining, |