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EHCI is usually used with companion controller (like OHCI) as companion controller. This information on the companion is missing currently in companion drivers. So, if the usb-uclass isn't aware, it may scan busses in any order: OHCI first, then EHCI. This is seen on STM32MP1 where DT probing makes the probe order to occur by increasing address (OHCI address < EHCI address). When a low speed or full-speed device is plugged in, it's not detected as EHCI should first detect it, and give ownership (handover) to OHCI. Current situation on STM32MP1 (with a low speed device plugged-in) STM32MP> usb start starting USB... Bus usb@5800c000: USB OHCI 1.0 Bus usb@5800d000: USB EHCI 1.00 scanning bus usb@5800c000 for devices... 1 USB Device(s) found scanning bus usb@5800d000 for devices... 1 USB Device(s) found scanning usb for storage devices... 0 Storage Device(s) found The "companion" property in the device tree allow to retrieve companion controller information, from the EHCI node. This allow marking the companion driver as such. With this patch (same low speed device plugged in): STM32MP> usb start starting USB... Bus usb@5800c000: USB OHCI 1.0 Bus usb@5800d000: USB EHCI 1.00 scanning bus usb@5800d000 for devices... 1 USB Device(s) found scanning bus usb@5800c000 for devices... 2 USB Device(s) found scanning usb for storage devices... 0 Storage Device(s) found STM32MP> usb tree USB device tree: 1 Hub (12 Mb/s, 0mA) | U-Boot Root Hub | +-2 Human Interface (1.5 Mb/s, 100mA) HP HP USB 1000dpi Laser Mouse 1 Hub (480 Mb/s, 0mA) u-boot EHCI Host Controller This also optimize bus scan when a High speed device is plugged in, as the usb-uclass skips OHCI in this case: STM32MP> usb reset resetting USB... Bus usb@5800c000: USB OHCI 1.0 Bus usb@5800d000: USB EHCI 1.00 scanning bus usb@5800d000 for devices... 2 USB Device(s) found scanning usb for storage devices... 1 Storage Device(s) found STM32MP> usb tree USB device tree: 1 Hub (480 Mb/s, 0mA) | u-boot EHCI Host Controller | +-2 Mass Storage (480 Mb/s, 200mA) SanDisk Cruzer Blade 03003432021922011407 Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Reviewed-by: Marek Vasut <marex@denx.de> |
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| common | ||
| dwc3 | ||
| emul | ||
| eth | ||
| gadget | ||
| host | ||
| isp1760 | ||
| mtu3 | ||
| musb | ||
| musb-new | ||
| phy | ||
| ulpi | ||
| Kconfig | ||