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[ Upstream commit 548011957d1d72e0b662300c8b32b81d593b796e ] Currently xhci-mtk needs software-managed bandwidth allocation for periodic endpoints, it allocates the microframe index for the first start-split packet for each endpoint. As this index allocation logic should avoid the conflicts with other full/low-speed periodic endpoints, it uses the worst case byte budgets on high-speed bus bandwidth For example, for an isochronos IN endpoint with 192 bytes budget, it will consume the whole 4 u-frames(188 * 4) while the actual full-speed bus budget should be just 192bytes. This patch changes the low/full-speed bandwidth allocation logic to use "approximate" best case budget for lower speed bandwidth management. For the same endpoint from the above example, the approximate best case budget is now reduced to (188 * 2) bytes. Without this patch, many usb audio headsets with 3 interfaces (audio input, audio output, and HID) cannot be configured on xhci-mtk. Signed-off-by: Ikjoon Jang <ikjn@chromium.org> Link: https://lore.kernel.org/r/20210805133937.1.Ia8174b875bc926c12ce427a5a1415dea31cc35ae@changeid Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.