usb: xhci: Update a comment about Stop Endpoint retries

Retries are no longer gated by a quirk, so remove that part.
Add a brief explanation of the timeout.

Signed-off-by: Michal Pecio <michal.pecio@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20250917210726.97100-3-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Michal Pecio

drivers/usb/host/xhci-ring.c

@@ -1262,8 +1262,9 @@ static void xhci_handle_cmd_stop_ep(struct xhci_hcd *xhci, int slot_id,
 			 * Stopped state, but it will soon change to Running.
 			 *
 			 * Assume this bug on unexpected Stop Endpoint failures.
-			 * Keep retrying until the EP starts and stops again, on
-			 * chips where this is known to help. Wait for 100ms.
+			 * Keep retrying until the EP starts and stops again or
+			 * up to a timeout (a defective HC may never start, or a
+			 * driver bug may cause stopping an already stopped EP).
 			 */
 			if (time_is_before_jiffies(ep->stop_time + msecs_to_jiffies(100)))
 				break;