Re: [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@fd000000: Register 2000140 NbrPorts 2
Starting the controller
USB XHCI 1.10
Bus usb@fd800000: USB EHCI 1.00
Bus usb@fd880000: USB EHCI 1.00
Bus usb@fd8c0000: USB OHCI 1.0
scanning bus usb@fd000000 for devices... 1 USB Device(s) found
scanning bus usb@fd800000 for devices... 2 USB Device(s) found
scanning bus usb@fd880000 for devices... 1 USB Device(s) found
scanning bus usb@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@fd000000: Register 2000140 NbrPorts 2
Starting the controller
USB XHCI 1.10
Bus usb@fd800000: USB EHCI 1.00
Bus usb@fd880000: USB EHCI 1.00
Bus usb@fd8c0000: USB OHCI 1.0
scanning bus usb@fd000000 for devices... 1 USB Device(s) found
scanning bus usb@fd800000 for devices... 4 USB Device(s) found
scanning bus usb@fd880000 for devices... 1 USB Device(s) found
scanning bus usb@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 <na...@radxa.com>
Reviewed-by: Kever Yang <kever.y...@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";
+};