linux-kernel - [PATCH v2 0/3] usb: gadget: uvc: allocate requests based on frame interval length and buffersize

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Date: Sun, 23 Jun 2024 01:48:28 +0200
From: Michael Grzeschik <m.grzeschik@...gutronix.de>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Daniel Scally <dan.scally@...asonboard.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Avichal Rakesh <arakesh@...gle.com>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Grzeschik <m.grzeschik@...gutronix.de>
Subject: [PATCH v2 0/3] usb: gadget: uvc: allocate requests based on frame
 interval length and buffersize

This patch series is improving the size calculation and allocation of
the uvc requests. Using the selected frame duration of the stream it is
possible to calculate the number of requests based on the interval
length.

This is an preperation to precalculate the request length based
on the actual per frame size for compressed formats.

Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
---
Changes in v2:
- added header size into calculation of request size
- Link to v1: https://lore.kernel.org/r/20240403-uvc_request_length_by_interval-v1-0-9436c4716233@pengutronix.de

---
Michael Grzeschik (3):
      usb: gadget: function: uvc: set req_size once when the vb2 queue is calculated
      usb: gadget: uvc: add g_parm and s_parm for frame interval
      usb: gadget: uvc: set req_size and n_requests based on the frame interval

 drivers/usb/gadget/function/uvc.h       |  1 +
 drivers/usb/gadget/function/uvc_queue.c | 32 +++++++++++++++-----
 drivers/usb/gadget/function/uvc_v4l2.c  | 52 +++++++++++++++++++++++++++++++++
 drivers/usb/gadget/function/uvc_video.c | 17 ++---------
 4 files changed, 81 insertions(+), 21 deletions(-)
---
base-commit: 819984a0dd3606b7c46fe156cd56a0dc0d604788
change-id: 20240403-uvc_request_length_by_interval-a7efd587d963

Best regards,
-- 
Michael Grzeschik <m.grzeschik@...gutronix.de>