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-rw-r--r--payloads/libpayload/drivers/usb/xhci_events.c34
1 files changed, 27 insertions, 7 deletions
diff --git a/payloads/libpayload/drivers/usb/xhci_events.c b/payloads/libpayload/drivers/usb/xhci_events.c
index 32a43fcfeb..139ea59619 100644
--- a/payloads/libpayload/drivers/usb/xhci_events.c
+++ b/payloads/libpayload/drivers/usb/xhci_events.c
@@ -226,7 +226,15 @@ xhci_wait_for_event_type(xhci_t *const xhci,
return *timeout_us;
}
-/* returns cc of command in question (pointed to by `address`) */
+/*
+ * Ref. xHCI Specification Revision 1.2, May 2019.
+ * Section 4.6.1.2.
+ *
+ * Process events from xHCI Abort command.
+ *
+ * Returns CC_COMMAND_RING_STOPPED on success and TIMEOUT on failure.
+ */
+
int
xhci_wait_for_command_aborted(xhci_t *const xhci, const trb_t *const address)
{
@@ -239,12 +247,13 @@ xhci_wait_for_command_aborted(xhci_t *const xhci, const trb_t *const address)
int cc = TIMEOUT;
/*
* Expects two command completion events:
- * The first with CC == COMMAND_ABORTED should point to address,
+ * The first with CC == COMMAND_ABORTED should point to address
+ * (not present if command was not running),
* the second with CC == COMMAND_RING_STOPPED should point to new dq.
*/
while (xhci_wait_for_event_type(xhci, TRB_EV_CMD_CMPL, &timeout_us)) {
if ((xhci->er.cur->ptr_low == virt_to_phys(address)) &&
- (xhci->er.cur->ptr_high == 0)) {
+ (xhci->er.cur->ptr_high == 0)) {
cc = TRB_GET(CC, xhci->er.cur);
xhci_advance_event_ring(xhci);
break;
@@ -252,20 +261,31 @@ xhci_wait_for_command_aborted(xhci_t *const xhci, const trb_t *const address)
xhci_handle_command_completion_event(xhci);
}
- if (!timeout_us)
- xhci_debug("Warning: Timed out waiting for COMMAND_ABORTED.\n");
+ if (timeout_us == 0) {
+ xhci_debug("Warning: Timed out waiting for "
+ "COMMAND_ABORTED or COMMAND_RING_STOPPED.\n");
+ goto update_and_return;
+ }
+ if (cc == CC_COMMAND_RING_STOPPED) {
+ /* There may not have been a command to abort. */
+ goto update_and_return;
+ }
+
+ timeout_us = USB_MAX_PROCESSING_TIME_US; /* 5s */
while (xhci_wait_for_event_type(xhci, TRB_EV_CMD_CMPL, &timeout_us)) {
if (TRB_GET(CC, xhci->er.cur) == CC_COMMAND_RING_STOPPED) {
- xhci->cr.cur = phys_to_virt(xhci->er.cur->ptr_low);
+ cc = CC_COMMAND_RING_STOPPED;
xhci_advance_event_ring(xhci);
break;
}
xhci_handle_command_completion_event(xhci);
}
- if (!timeout_us)
+ if (timeout_us == 0)
xhci_debug("Warning: Timed out "
"waiting for COMMAND_RING_STOPPED.\n");
+
+update_and_return:
xhci_update_event_dq(xhci);
return cc;
}