When using more than one Event Ring segment (ERSTSZ > 1), software shall
set the DESI bits in the ERDP register to the number of the segment to
which the upper ERDP bits are pointing.  The xHC may use the DESI bits
as a shortcut to determine whether it needs to check for an Event Ring
Full condition:  If it's enqueueing events in a different segment, it
need not compare its internal Enqueue Pointer with the Dequeue Pointer
in the upper bits of the ERDP register (sec 5.5.2.3.3).

Not setting the DESI bits correctly can result in the xHC enqueueing
events past the Dequeue Pointer.  On Renesas uPD720201 host controllers,
incorrect DESI bits cause an interrupt storm.  For comparison, VIA VL805
host controllers do not exhibit such problems.  Perhaps they do not take
advantage of the optimization afforded by the DESI bits.

To fix the issue, assign the segment number to each struct xhci_segment
in xhci_segment_alloc().  When advancing the Dequeue Pointer in
xhci_update_erst_dequeue(), write the segment number to the DESI bits.

On driver probe, set the DESI bits to zero in xhci_set_hc_event_deq() as
processing starts in segment 0.  Likewise on driver teardown, clear the
DESI bits to zero in xhci_free_interrupter() when clearing the upper
bits of the ERDP register.  Previously those functions (incorrectly)
treated the DESI bits as if they're declared RsvdP.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20231019102924.2797346-5-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>