A bunch of miscellaneous debug messages to aid in working out USB
issues.
Signed-off-by: Hector Martin <mar...@marcan.st>
---
drivers/usb/host/xhci-ring.c | 29 ++++++++++++++++++++++++++---
1 file changed, 26 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index b60661fe05e7..dabe6cf86af2 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -214,6 +214,9 @@ static dma_addr_t queue_trb(struct xhci_ctrl *ctrl, struct
xhci_ring *ring,
addr = xhci_trb_virt_to_dma(ring->enq_seg, (union xhci_trb *)trb);
+ debug("trb @ %llx: %08x %08x %08x %08x\n", addr,
+ trb_fields[0], trb_fields[1], trb_fields[2], trb_fields[3]);
+
inc_enq(ctrl, ring, more_trbs_coming);
return addr;
@@ -296,6 +299,8 @@ void xhci_queue_command(struct xhci_ctrl *ctrl, dma_addr_t
addr, u32 slot_id,
{
u32 fields[4];
+ debug("CMD: %llx 0x%x 0x%x %d\n", addr, slot_id, ep_index, cmd);
+
BUG_ON(prepare_ring(ctrl, ctrl->cmd_ring, EP_STATE_RUNNING));
fields[0] = lower_32_bits(addr);
@@ -471,8 +476,14 @@ union xhci_trb *xhci_wait_for_event(struct xhci_ctrl
*ctrl, trb_type expected)
type = TRB_FIELD_TO_TYPE(le32_to_cpu(event->event_cmd.flags));
if (type == expected ||
- (expected == TRB_NONE && type != TRB_PORT_STATUS))
+ (expected == TRB_NONE && type != TRB_PORT_STATUS)) {
+ debug("Event: %08x %08x %08x %08x\n",
+ le32_to_cpu(event->generic.field[0]),
+ le32_to_cpu(event->generic.field[1]),
+ le32_to_cpu(event->generic.field[2]),
+ le32_to_cpu(event->generic.field[3]));
return event;
+ }
if (type == TRB_PORT_STATUS)
/* TODO: remove this once enumeration has been reworked */
@@ -484,8 +495,9 @@ union xhci_trb *xhci_wait_for_event(struct xhci_ctrl *ctrl,
trb_type expected)
le32_to_cpu(event->generic.field[2])) !=
COMP_SUCCESS);
else
- printf("Unexpected XHCI event TRB, skipping... "
+ printf("Unexpected XHCI event TRB, expected %d... "
"(%08x %08x %08x %08x)\n",
+ expected,
le32_to_cpu(event->generic.field[0]),
le32_to_cpu(event->generic.field[1]),
le32_to_cpu(event->generic.field[2]),
@@ -602,10 +614,13 @@ static void abort_td(struct usb_device *udev, int
ep_index)
static void record_transfer_result(struct usb_device *udev,
union xhci_trb *event, int length)
{
+ xhci_comp_code code = GET_COMP_CODE(
+ le32_to_cpu(event->trans_event.transfer_len));
+
udev->act_len = min(length, length -
(int)EVENT_TRB_LEN(le32_to_cpu(event->trans_event.transfer_len)));
- switch (GET_COMP_CODE(le32_to_cpu(event->trans_event.transfer_len))) {
+ switch (code) {
case COMP_SUCCESS:
BUG_ON(udev->act_len != length);
/* fallthrough */
@@ -613,16 +628,23 @@ static void record_transfer_result(struct usb_device
*udev,
udev->status = 0;
break;
case COMP_STALL:
+ debug("Xfer STALL\n");
udev->status = USB_ST_STALLED;
break;
case COMP_DB_ERR:
+ debug("Xfer DB_ERR\n");
+ udev->status = USB_ST_BUF_ERR;
+ break;
case COMP_TRB_ERR:
+ debug("Xfer TRB_ERR\n");
udev->status = USB_ST_BUF_ERR;
break;
case COMP_BABBLE:
+ debug("Xfer BABBLE\n");
udev->status = USB_ST_BABBLE_DET;
break;
default:
+ debug("Xfer error: %d\n", code);
udev->status = 0x80; /* USB_ST_TOO_LAZY_TO_MAKE_A_NEW_MACRO */
}
}
@@ -1016,6 +1038,7 @@ int xhci_ctrl_tx(struct usb_device *udev, unsigned long
pipe,
record_transfer_result(udev, event, length);
xhci_acknowledge_event(ctrl);
if (udev->status == USB_ST_STALLED) {
+ debug("EP %d stalled\n", ep_index);
reset_ep(udev, ep_index);
return -EPIPE;
}
--
2.41.0
