• Peter Chen's avatar
    doc: usb: ci-hdrc-usb2: add property non-zero-ttctrl-ttha · 4670ba6c
    Peter Chen authored
    If this property is not set, the max packet size is 1023 bytes, and if
    the total of packet size for pervious transactions are more than 256 bytes,
    it can't accept any transactions within this frame. The use case is single
    transaction, but higher frame rate.
    
    If this property is set, the max packet size is 188 bytes, it can handle
    more transactions than above case, it can accept transactions until it
    considers the left room size within frame is less than 188 bytes, software
    needs to make sure it does not send more than 90%
    maximum_periodic_data_per_frame. The use case is multiple transactions, but
    less frame rate.
    Signed-off-by: default avatarPeter Chen <peter.chen@nxp.com>
    4670ba6c
ci-hdrc-usb2.txt 4.58 KB