Fork of alistair23 Linux kernel for reMarkable from https://github.com/alistair23/linux
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Gadget applications may have a requirement to disable the U1 and U2 entry based on the usecase. Below are few usecases where the disabling U1/U2 entries may be possible. Usecase 1: When combining dwc3 with an redriver for a USB Type-C device solution, it sometimes have problems with leaving U1/U2 for certain hosts, resulting in link training errors and reconnects. For this U1/U2 state entries may be avoided. Usecase 2: When performing performance benchmarking on mass storage gadget the U1 and U2 entries can be disabled. Usecase 3: When periodic transfers like ISOC transfers are used with bInterval of 1 which doesn't require the link to enter into U1 or U2 state entry (since ping is issued from host for every uframe interval). In this case the U1 and U2 entry can be disabled. Disablement of U1/U2 can be done by setting U1DevExitLat and U2DevExitLat values to 0 in the BOS descriptor. Host on seeing 0 value for U1DevExitLat and U2DevExitLat, it doesn't send SET_SEL requests to the gadget. There may be some hosts which may send SET_SEL requests even after seeing 0 in the UxDevExitLat of BOS descriptor. To aviod U1/U2 entries for these type of hosts, dwc3 controller can be programmed to reject those U1/U2 requests by not enabling ACCEPTUxENA bits in DCTL register. This patch updates the same. Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com> Signed-off-by: Claus H. Stovgaard <cst@phaseone.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> |
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README
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.