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[0/3] usb: gadget: uvc: improve uvc gadget performance

Message ID 20210421211513.29002-1-m.grzeschik@pengutronix.de
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Series usb: gadget: uvc: improve uvc gadget performance | expand

Message

Michael Grzeschik April 21, 2021, 9:15 p.m. UTC 
This series improves the performance of the uvc video gadget by adding a
zero copy routine using the scatter list interface of the gadget. The
series also increases the amount of allocated requests depending of the
speed and it also reduces the interrupt load by only trigger on every
16th request in case of super-speed.

Michael Grzeschik (3):
  usb: gadget: uvc: make uvc_num_requests depend on gadget speed
  usb: gadget: uvc: add scatter gather support
  usb: gadget: uvc: decrease the interrupt load to a quarter

 drivers/usb/gadget/Kconfig              |   1 +
 drivers/usb/gadget/function/f_uvc.c     |   1 +
 drivers/usb/gadget/function/uvc.h       |  15 ++-
 drivers/usb/gadget/function/uvc_queue.c |  30 ++++-
 drivers/usb/gadget/function/uvc_queue.h |   5 +-
 drivers/usb/gadget/function/uvc_video.c | 145 +++++++++++++++++++-----
 6 files changed, 164 insertions(+), 33 deletions(-)