hello ,
I designed a custom board for tx2 module. and I use a usb3.0 hub(TI, TUSB8020) to expand one more usb3.0 port .but I make a mistake connect about the ss0 port：
TX2 SS0 RX ---- USBHUB SS RX
TX2 SS0 TX ---- USBHUB SS TX
These two groups of wires should be connected in a cross connection. so the right connect should be
TX2 SS0 TX ---- USBHUB SS RX
TX2 SS0 RX ---- USBHUB SS TX
there is no way to change the physical connection.
when the kernel start，usb2.0 can be hub，and work fine。and the ss port can not be hub.
and the terminal will periodically output some log characters。
When there is no physical device on the USB port, it output（period: 5s）
[ 2866.875096] xhci-tegra 3530000.xhci: entering ELPG
[ 2866.883149] xhci-tegra 3530000.xhci: entering ELPG done
[ 2866.892960] xhci-tegra 3530000.xhci: exiting ELPG
[ 2866.919393] xhci-tegra 3530000.xhci: Firmware timestamp: 2017-12-07 10:50:08 UTC, Version: 55.09 release
[ 2866.932559] xhci-tegra 3530000.xhci: exiting ELPG done
[ 2866.932744] xhci-tegra 3530000.xhci: tegra_xhci_mbox_work mailbox command 6
When there is a physical device on the USB port, it output (period :34s)
[ 2620.505991] xhci-tegra 3530000.xhci: tegra_xhci_mbox_work mailbox command 5
[ 2620.513175] xhci-tegra 3530000.xhci: tegra_xhci_mbox_work ignore firmware MBOX_CMD_DEC_SSPI_CLOCK request
[ 2620.523071] xhci-tegra 3530000.xhci: tegra_xhci_mbox_work mailbox command 4
[ 2620.530130] xhci-tegra 3530000.xhci: tegra_xhci_mbox_work ignore firmware MBOX_CMD_INC_SSPI_CLOCK request
so I want to know how to stop the period msg output in terminal? maybe disable usb3.0 ss port, right ??