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On some xHCI controllers (e.g. Rockchip RK3399/RK3328/RK1808), which are integrated in DWC3 IP, need to enable the Evaluate Next TRB(ENT) flag in the TRB data structure to force xHC to pre-fetch the next TRB of a TD. It's useful for the stability of xHCI when transfer large data. I have verify this patch on the following three cases: Case 1: On RK3399/RK3399Pro platforms, I found that when USB 3.0 read/write at the same time in the following test case, it may easily fail without this patch. Host transfer: 1024B, 4MB, 4MB, 4MB Device transfer: 1024B, 4MB, 4MB, 4MB Both Host and Device transfer "24B, 4MB, 4MB, 4M" Repeatedly until transfer fail. Case 2: On RK3399 platform, Type-C1 USB 3.0 port connects with HUB and Orbbec USB 3.0 Camera with the enumeration information: usb 5-1: new high-speed USB device number 2 using xhci-hcd usb 5-1: New USB device found, idVendor=05e3, idProduct=0610 usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 5-1: Product: USB2.1 Hub usb 5-1: Manufacturer: GenesysLogic hub 5-1:1.0: USB hub found hub 5-1:1.0: 2 ports detected usb 6-1: new SuperSpeed USB device number 2 using xhci-hcd usb 6-1: New USB device found, idVendor=05e3, idProduct=0620 usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 6-1: Product: USB3.1 Hub usb 6-1: Manufacturer: GenesysLogic hub 6-1:1.0: USB hub found hub 6-1:1.0: 2 ports detected usb 5-1.2: new high-speed USB device number 3 using xhci-hcd usb 5-1.2: New USB device found, idVendor=2bc5, idProduct=050d usb 5-1.2: New USB device strings: Mfr=2, Product=1, SerialNumber=3 usb 5-1.2: Product: USB usb 5-1.2: Manufacturer: USB usb 5-1.2: SerialNumber: USB uvcvideo: Found UVC 1.00 device USB (2bc5:050d) usb 6-1.2: new SuperSpeed USB device number 3 using xhci-hcd usb 6-1.2: New USB device found, idVendor=2bc5, idProduct=060d usb 6-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 6-1.2: Product: Orbbec(R) Astra(TM) usb 6-1.2: Manufacturer: Orbbec(R) Without this patch, it's possible to fail to open the Orbbec USB 3.0 camera or fail to preview image. Case3: On RK3399Pro platform, transfer the NPU data between the NPU USB 3.0 device and RK3399 USB 3.0 host. Change-Id: I87b1d8b8b6912d77b988362f2f6dcd7766da8b0e 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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.