[PATCH] arm: dts: rockchip: disable "usb_host0_ohci" to make boot faster for Radxa ROCK 3A

[Kever Yang]

Hi Naoki,

On 2024/8/2 10:49, FUKAUMI Naoki wrote:
> on-board USB 2.0 hub, FE1.1s, has Transaction Translator which can
> handle USB 1.x devices via "usb_host0_ehci". so we can omit
> "usb_host0_ohci" and make boot faster (a little).

The OHCI is in use when the direct connect device is USB1.1; and if the 
board

connect with usb2.0 hub, then only EHCI is working and OHCI has no use.


>
> => usb start
> starting USB...
> Bus usb at fd000000: Register 2000140 NbrPorts 2
> Starting the controller
> USB XHCI 1.10
> Bus usb at fd800000: USB EHCI 1.00
> Bus usb at fd880000: USB EHCI 1.00
> Bus usb at fd8c0000: USB OHCI 1.0
> scanning bus usb at fd000000 for devices... 1 USB Device(s) found
> scanning bus usb at fd800000 for devices... 2 USB Device(s) found
> scanning bus usb at fd880000 for devices... 1 USB Device(s) found
> scanning bus usb at fd8c0000 for devices... 3 USB Device(s) found
>         scanning usb for storage devices... 1 Storage Device(s) found
> => usb tree
> USB device tree:
>    1  Hub (5 Gb/s, 0mA)
>       U-Boot XHCI Host Controller
>
>    1  Hub (480 Mb/s, 0mA)
>    |  u-boot EHCI Host Controller
>    |
>    +-2  Hub (480 Mb/s, 100mA)
>          USB 2.0 Hub
>
>    1  Hub (480 Mb/s, 0mA)
>       u-boot EHCI Host Controller
>
>    1  Hub (12 Mb/s, 0mA)
>    |   U-Boot Root Hub
>    |
>    +-2  Hub (12 Mb/s, 100mA)
>      |  ALCOR Generic USB Hub
>      |
>      +-3  Mass Storage (12 Mb/s, 300mA)
>           JetFlash Mass Storage Device 02K1RNH5MJFV4TX6
>
> => usb reset
> resetting USB...
> Host not halted after 16000 microseconds.
> Bus usb at fd000000: Register 2000140 NbrPorts 2
> Starting the controller
> USB XHCI 1.10
> Bus usb at fd800000: USB EHCI 1.00
> Bus usb at fd880000: USB EHCI 1.00
> Bus usb at fd8c0000: USB OHCI 1.0
> scanning bus usb at fd000000 for devices... 1 USB Device(s) found
> scanning bus usb at fd800000 for devices... 4 USB Device(s) found
> scanning bus usb at fd880000 for devices... 1 USB Device(s) found
> scanning bus usb at fd8c0000 for devices... 1 USB Device(s) found
>         scanning usb for storage devices... 1 Storage Device(s) found
> => usb tree
> USB device tree:
>    1  Hub (5 Gb/s, 0mA)
>       U-Boot XHCI Host Controller
>
>    1  Hub (480 Mb/s, 0mA)
>    |  u-boot EHCI Host Controller
>    |
>    +-2  Hub (480 Mb/s, 100mA)
>      |   USB 2.0 Hub
>      |
>      +-3  Hub (12 Mb/s, 100mA)
>        |  ALCOR Generic USB Hub
>        |
>        +-4  Mass Storage (12 Mb/s, 300mA)
>             JetFlash Mass Storage Device 02K1RNH5MJFV4TX6
>
>    1  Hub (480 Mb/s, 0mA)
>       u-boot EHCI Host Controller
>
>    1  Hub (12 Mb/s, 0mA)
>        U-Boot Root Hub
>
> Signed-off-by: FUKAUMI Naoki <naoki at radxa.com>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>

Thanks,
- Kever
> ---
>   arch/arm/dts/rk3568-rock-3a-u-boot.dtsi | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi b/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
> index 9d18f5d0b36..9078b9a67a2 100644
> --- a/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
> +++ b/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
> @@ -40,3 +40,7 @@
>   		spi-tx-bus-width = <1>;
>   	};
>   };
> +
> +&usb_host0_ohci {
> +	status = "disabled";
> +};