This series fixes a few USB issues that show up on the Toradex i.MX95
based modules and finally enables USB support for them.
The i.MX95 has two USB controllers: a host-only DWC3 controller and a
ChipIdea OTG controller. Getting both of them to work together in
U-Boot requires a couple of fixes:
- Combining DWC3 (host only) with CI_UDC as the gadget driver, while
DM_USB_GADGET is disabled, currently fails to link because DWC3 core
provides dm_usb_gadget_handle_interrupts() even when the DWC3 gadget
driver is not built (patch 1).
- The DWC3 reference clock lookup added by commit c6583354b7c1 ("usb:
dwc3: Look up reference clock DT phandle in both controller DT nodes")
resolves an index found in the child node's clock-names against the
clk_bulk of the parent glue node. On the Verdin iMX95 the two lists
have a different order, so the wrong clock is picked, which shows up
as intermittent enumeration failures behind a USB hub (patch 2).
- ehci_gadget picks the first USB device it finds, which on the i.MX95
is the host-only DWC3 controller instead of the ChipIdea OTG
controller, so "ums" never enters device mode. Skip host-only
controllers when looking for the gadget controller (patch 3).
The remaining patches enable CI_UDC on the Verdin iMX95 and turn on the
DWC3 host controller support for the Verdin iMX95 and the Toradex SMARC
iMX95.
Testing
-------
USB was tested on a Verdin iMX95, a Toradex SMARC iMX95 and an Apalis
iMX6 (as a regression test for the ehci_gadget change) with:
usb start
and with:
ums 0 mmc 0
All three boards were enumerating a USB stick and appeared as USB
devices on a PC connected to the USB device port.
Stefan Eichenberger (6):
usb: dwc3: core: only provide legacy gadget IRQ handler when
USB_DWC3_GADGET
usb: dwc3-generic: fix ref clock lookup indexing wrong clk_bulk array
usb: skip host-only devices when picking the ehci gadget controller
configs: verdin-imx95: enable CI_UDC usb gadget driver
toradex: verdin-imx95: enable DWC3 USB controller support
toradex: smarc-imx95: enable DWC3 USB controller support
.../dts/imx95-toradex-smarc-dev-u-boot.dtsi | 8 -------
.../arm/dts/imx95-verdin-wifi-dev-u-boot.dtsi | 8 -------
configs/toradex-smarc-imx95_defconfig | 4 ++++
configs/verdin-imx95_defconfig | 3 ++-
drivers/usb/dwc3/core.c | 2 +-
drivers/usb/dwc3/dwc3-generic.c | 24 +++++++++++++++++--
drivers/usb/host/usb-uclass.c | 23 ++++++++++++++++--
7 files changed, 50 insertions(+), 22 deletions(-)
--
2.55.0
