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[0/2] Multi-segment Event Ring support for XHCI

Message ID cover.1692085657.git.lukas@wunner.de
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Series Multi-segment Event Ring support for XHCI | expand

Message

Lukas Wunner Aug. 15, 2023, 12:40 p.m. UTC 
Enlarge the XHCI Event Ring to cope with high load situations
by allowing more than one segment (patch [2/2]).  The patch is
lifted from the Raspberry Pi kernel, it has been in use there
for 4 years.  I've taken the liberty to slightly edit the commit
message and the patch itself for upstream.

As a prerequisite for the patch, ensure that the DESI bits in the
ERDP register are set correctly (patch [1/2]).  Incorrect DESI bits
cause an interrupt storm on Renesas uPD720201 host controllers.

Jonathan Bell (1):
  xhci: Use more than one Event Ring segment

Lukas Wunner (1):
  xhci: Set DESI bits in ERDP register correctly

 drivers/usb/host/xhci-mem.c  | 35 ++++++++++++++++++-----------------
 drivers/usb/host/xhci-ring.c |  2 +-
 drivers/usb/host/xhci.h      |  6 ++++--
 3 files changed, 23 insertions(+), 20 deletions(-)