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653a2c76e2
Some USB Readers base on the keyboard boot protocol, but they don't properly set the data toggle in the status stage when set the LED request. The known abnormal usb hid devices include: [1] idVendor=413d, idProduct=2107 [2] idVendor=ffff, idProduct=0035 This cause xHCI died on Rockchip platforms with the following typical log. [ 38.564579] usb 5-1: new full-speed USB device number 3 using xhci-hcd [ 38.707763] usb 5-1: New USB device found, idVendor=413d, idProduct=2107, bcdDevice= 0.00 [ 38.707829] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 38.707855] usb 5-1: Product: USB Reader [ 38.707880] usb 5-1: Manufacturer: DXTeco [ 38.707903] usb 5-1: SerialNumber: 2008-07-15 ...... [ 43.325848] usb 5-1: USB disconnect, device number 3 [ 48.481188] xhci-hcd xhci-hcd.1.auto: xHCI host not responding to stop endpoint command. [ 48.491454] xhci-hcd xhci-hcd.1.auto: xHCI host controller not responding, assume dead [ 48.491617] xhci-hcd xhci-hcd.1.auto: HC died; cleaning up In fact, the USB Readers don't support LED control, so it can ignore set Led for USB Readers to avoid xHCI died issue. Change-Id: Ie2cb6f8204055035d434f32dea548461c58c5ab1 Signed-off-by: William Wu <william.wu@rock-chips.com>
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.