[RFC PATCH v2 00/64] drivers: usb: dwc3: sync code with Linux v6.16-rc7

Tom Rini trini at konsulko.com
Fri May 8 18:03:02 CEST 2026 

On Fri, May 08, 2026 at 09:42:40AM -0600, Simon Glass wrote:
> Hi Jens,
> 
> On Thu, 7 May 2026 at 03:28, Jens Wiklander <jens.wiklander at linaro.org> wrote:
> >
> > Hi,
> >
> > This is a follow-up to Jerome's patchset [1], addressing previous feedback
> > regarding the monolithic nature of the driver update.
> >
> > The DWC3 USB driver was forked from the Linux kernel v3.19-rc1 eleven years
> > ago by commit 85d5e7075f33 ("usb: dwc3: add dwc3 folder from linux kernel
> > to u-boot"). Since then, not many kernel changes have been ported back into
> > U-Boot.
> >
> > This series synchronizes the DWC3 core with Linux v6.16-rc7. To provide
> > a clear audit trail and maintain bisectability, I have structured the
> > series as follows:
> >
> > 1. Restore to Baseline: The first commit reverts U-Boot-specific changes
> >    to drivers/usb/dwc3 to return the directory to a clean v3.19-rc1 state.
> > 2. Milestone Imports: A sequence of 50+ commits follows, each performing
> >    a "snapshot" import of the drivers/usb/dwc3 directory for every major
> >    kernel version (v3.19 through v6.16-rc7).
> > 3. U-Boot Adaptation: The final commits (based on Jerome's original work)
> >    re-introduce the necessary glue code, XHCI/UDC updates, and build fixes
> >    required for U-Boot integration.
> >
> > The final diff is identical to [1]. I decided to stick with that for now to
> > focus on the method of how we import or update the code.
> >
> > Note that this is compile-tested only. The CI pipeline on source.denx.de
> > was used as an OK/NOK indicator [2].
> >
> > The previous patchset was tested on xilinx_zynqmp_kria_defconfig and since
> > this diff is identical to the previous, it should still work on that
> > platform. With the help of a custom build script [3] and with an additional
> > patch [4], I could boot the Kria KV260 board and make it detect a USB SSD
> > plugged into one of its USB 3.0 ports. It certainly doesn't mean all
> > platforms using the DWC3 driver are still OK, but at least there is some
> > hope. If this breaks your platform I'd like to know, and if you can send a
> > fix it's even better.
> >
> > I tried cherry-picking all the 1000+ patches in v3.19-rc1..v6.16-rc7. There
> > were a few conflicts, even when backing out the original U-Boot patches on
> > top of the original v3.19-rc1 import. However, the resulting state still
> > diverged significantly from [1].
> >
> > Instead, I've imported each new kernel in a separate commit. That way it's
> > very clear which kernel patches are included. Since there aren't too many
> > patches for each kernel I'm listing the relevant commits in the U-Boot
> > commit message for easier reference. I did this with a script so it's easy
> > to make changes, if the approach is OK but we need to tune it. With this
> > approach it should be easy to tell if a Fixes patch for the kernel might
> > also be needed here.
> >
> > Thanks,
> > Jens
> >
> > [1] https://lore.kernel.org/all/20251121153812.2076440-1-jerome.forissier@linaro.org/
> > [2] https://source.denx.de/u-boot/custodians/u-boot-tpm/-/pipelines/30004
> > [3] https://source.denx.de/u-boot/u-boot-extras/-/raw/master/contrib/jforissier/zynqmp_kv260_build.sh
> > [4] https://gitlab.com/Linaro/trustedsubstrate/meta-ts/-/raw/master/meta-trustedsubstrate/recipes-bsp/u-boot/u-boot/zynqmp-kria-starter/0001-kv260-fix-usb.patch
> >
> > RFC v1 -> RFC v2:
> > - Split the v1 ("usb: dwc3: re-import from kernel v6.16-rc7") into ("usb:
> >   dwc3: restore to original v3.19-rc1 kernel import"),  ("usb: dwc3: import
> >   from kernel v3.19)..("usb: dwc3: import from kernel v6.16-rc7")
> >
> > Jens Wiklander (60):
> >   usb: dwc3: restore to original v3.19-rc1 kernel import
> >   usb: dwc3: import from kernel v3.19
> >   usb: dwc3: import from kernel v4.0
> >   usb: dwc3: import from kernel v4.1
> >   usb: dwc3: import from kernel v4.2
> >   usb: dwc3: import from kernel v4.3
> >   usb: dwc3: import from kernel v4.4
> >   usb: dwc3: import from kernel v4.5
> >   usb: dwc3: import from kernel v4.6
> >   usb: dwc3: import from kernel v4.7
> >   usb: dwc3: import from kernel v4.8
> >   usb: dwc3: import from kernel v4.9
> >   usb: dwc3: import from kernel v4.10
> >   usb: dwc3: import from kernel v4.11
> >   usb: dwc3: import from kernel v4.12
> >   usb: dwc3: import from kernel v4.13
> >   usb: dwc3: import from kernel v4.14
> >   usb: dwc3: import from kernel v4.15
> >   usb: dwc3: import from kernel v4.16
> >   usb: dwc3: import from kernel v4.17
> >   usb: dwc3: import from kernel v4.18
> >   usb: dwc3: import from kernel v4.19
> >   usb: dwc3: import from kernel v4.20
> >   usb: dwc3: import from kernel v5.0
> >   usb: dwc3: import from kernel v5.1
> >   usb: dwc3: import from kernel v5.2
> >   usb: dwc3: import from kernel v5.3
> >   usb: dwc3: import from kernel v5.4
> >   usb: dwc3: import from kernel v5.5
> >   usb: dwc3: import from kernel v5.6
> >   usb: dwc3: import from kernel v5.7
> >   usb: dwc3: import from kernel v5.8
> >   usb: dwc3: import from kernel v5.9
> >   usb: dwc3: import from kernel v5.10
> >   usb: dwc3: import from kernel v5.11
> >   usb: dwc3: import from kernel v5.12
> >   usb: dwc3: import from kernel v5.13
> >   usb: dwc3: import from kernel v5.14
> >   usb: dwc3: import from kernel v5.15
> >   usb: dwc3: import from kernel v5.16
> >   usb: dwc3: import from kernel v5.17
> >   usb: dwc3: import from kernel v5.18
> >   usb: dwc3: import from kernel v5.19
> >   usb: dwc3: import from kernel v6.0
> >   usb: dwc3: import from kernel v6.1
> >   usb: dwc3: import from kernel v6.2
> >   usb: dwc3: import from kernel v6.3
> >   usb: dwc3: import from kernel v6.4
> >   usb: dwc3: import from kernel v6.5
> >   usb: dwc3: import from kernel v6.6
> >   usb: dwc3: import from kernel v6.7
> >   usb: dwc3: import from kernel v6.8
> >   usb: dwc3: import from kernel v6.9
> >   usb: dwc3: import from kernel v6.10
> >   usb: dwc3: import from kernel v6.11
> >   usb: dwc3: import from kernel v6.12
> >   usb: dwc3: import from kernel v6.13
> >   usb: dwc3: import from kernel v6.14
> >   usb: dwc3: import from kernel v6.15
> >   usb: dwc3: import from kernel v6.16-rc7
> >
> > Jerome Forissier (4):
> >   usb: host: re-import xhci-ext-caps.h from kernel v6.16-rc7
> >   usb: gadget: re-import epautoconf.c from kernel v6.16-rc7
> >   usb: udc: re-import udc-core.c from kernel v6.16-rc7
> >   usb: fix build after resync of DWC3 with kernel v6.16-rc7
> >
> >  drivers/usb/cdns3/ep0.c                |    8 +-
> >  drivers/usb/common/common.c            |   23 +
> >  drivers/usb/dwc3/Makefile              |   57 +-
> >  drivers/usb/dwc3/core.c                | 1780 ++++++----
> >  drivers/usb/dwc3/core.h                | 1120 +++++--
> >  drivers/usb/dwc3/debug.h               |  432 +++
> >  drivers/usb/dwc3/dwc3-omap.c           |    2 -
> >  drivers/usb/dwc3/ep0.c                 |  737 +++--
> >  drivers/usb/dwc3/gadget.c              | 4152 ++++++++++++++++--------
> >  drivers/usb/dwc3/gadget.h              |  124 +-
> >  drivers/usb/dwc3/glue.h                |   36 +
> >  drivers/usb/dwc3/io.h                  |   29 +-
> >  drivers/usb/dwc3/linux-compat.h        |   16 -
> >  drivers/usb/dwc3/samsung_usb_phy.c     |   77 -
> >  drivers/usb/dwc3/ti_usb_phy.c          |    2 -
> >  drivers/usb/gadget/at91_udc.c          |   46 -
> >  drivers/usb/gadget/atmel_usba_udc.c    |  102 +-
> >  drivers/usb/gadget/ci_udc.c            |  419 ---
> >  drivers/usb/gadget/composite.c         |    2 +-
> >  drivers/usb/gadget/dwc2_udc_otg.c      |  174 +-
> >  drivers/usb/gadget/epautoconf.c        |  289 +-
> >  drivers/usb/gadget/ether.c             |   21 +-
> >  drivers/usb/gadget/f_acm.c             |   20 +-
> >  drivers/usb/gadget/f_fastboot.c        |   10 +-
> >  drivers/usb/gadget/f_mass_storage.c    |    5 +-
> >  drivers/usb/gadget/f_rockusb.c         |   11 +-
> >  drivers/usb/gadget/f_sdp.c             |   12 +-
> >  drivers/usb/gadget/f_thor.c            |   19 +-
> >  drivers/usb/gadget/udc/Makefile        |    1 +
> >  drivers/usb/gadget/udc/udc-core.c      | 1096 ++++++-
> >  drivers/usb/host/xhci-dwc3.c           |    4 +-
> >  drivers/usb/host/xhci-ext-caps.h       |  158 +
> >  drivers/usb/host/xhci-exynos5.c        |    2 +-
> >  drivers/usb/mtu3/mtu3_gadget_ep0.c     |   16 +-
> >  drivers/usb/musb-new/musb_gadget_ep0.c |   24 +-
> >  drivers/usb/musb-new/musb_uboot.c      |   39 -
> >  include/dm/device_compat.h             |   13 +
> >  include/dm/read.h                      |   46 +
> >  include/linux/compat.h                 |   15 +
> >  include/linux/usb/ch9.h                |   25 +-
> >  include/linux/usb/gadget.h             |  520 +--
> >  include/linux/usb/otg.h                |   10 +
> >  include/linux/usb/phy.h                |   56 +
> >  43 files changed, 7659 insertions(+), 4091 deletions(-)
> >  create mode 100644 drivers/usb/dwc3/debug.h
> >  create mode 100644 drivers/usb/dwc3/glue.h
> >  delete mode 100644 drivers/usb/dwc3/linux-compat.h
> >  delete mode 100644 drivers/usb/dwc3/samsung_usb_phy.c
> >  create mode 100644 drivers/usb/host/xhci-ext-caps.h
> >
> >
> > base-commit: 0f865ab5d68484b4dc1724809de1be06edc85df1
> > --
> > 2.43.0
> >
> 
> This makes me wonder what USB tests we have. Some boards use USB for
> Ethernet, but are there any storage tests, etc.?

We've had test/py/tests/test_usb.py for two years now, and so yes, we
have some hardware tests for USB functionality. I haven't tried getting
them enabled in the sage labe, but it's on the TODO list. Along with our
DFU tests, again.

-- 
Tom
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