On 16 June 2017 at 07:31, Bin Meng bmeng.cn@gmail.com wrote:
The scratchpad buffer array is used to define the locations of statically allocated memory pages that are available for the private use of the xHC. The xHCI spec explicitly mentions that system software shall allocate the scratchpad buffers before placing the xHC in to Run mode (Run/Stop (R/S) = ‘1’), however U-Boot is missing this part.
This causes xHC on Intel platform does not respond the very first 'enable slot' command that is given to xHC and the 'enable slot' command completion event TRB is never generated and xHC seems to hang forever.
Signed-off-by: Bin Meng bmeng.cn@gmail.com
drivers/usb/host/xhci-mem.c | 87 +++++++++++++++++++++++++++++++++++++++++++++ drivers/usb/host/xhci.h | 10 ++++-- 2 files changed, 95 insertions(+), 2 deletions(-)
Reviewed-by: Simon Glass sjg@chromium.org