Replace the private FOTG210 EHCI fork with the common EHCI core and
quirks for its shifted or missing registers, integrated transaction
translator, speed reporting, and reset sequence.

This is a late reaction to a comment from Daniel Palmer in 2023:
https://lore.kernel.org/linux-usb/CAFr9PXmVXqAX73VUzAt_M2yPN93in9Y_LHyYcEA1Dfj_m_4ZHA@mail.gmail.com/

The fork was originally made from the v3.7 EHCI core driver. Arguably
this was a bad idea since it copied over 5000 lines of code. Correct the
mistake by using the maintained common implementation.

Also clean up fixed-role initialization, power and resource handling,
UDC lifecycle, and system sleep handling. The binding and Gemini board
updates are split into a separate series.

Tested on the D-Link DIR-685.

Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw@kernel.org>
---
Changes in v2:
- Split the first v1 EHCI core patch into three patches covering port
  status registers, port reset and speed hooks, and other quirks.
- Call reset_control_reset() without a redundant optional-reset NULL
  check.
- Link to v1: https://patch.msgid.link/20260831-gemini-usb-fotg2-v1-0-8a8ee12c4b32@kernel.org

---
Linus Walleij (5):
      usb: ehci: support non-standard port status registers
      usb: ehci: add port reset and speed hooks
      usb: ehci: support additional controller quirks
      usb: fotg210: use the common EHCI core
      usb: fotg210-udc: fix endpoint and resource handling

 drivers/usb/fotg210/Kconfig        |    2 +
 drivers/usb/fotg210/fotg210-core.c |  274 +-
 drivers/usb/fotg210/fotg210-hcd.c  | 5672 +-----------------------------------
 drivers/usb/fotg210/fotg210-hcd.h  |  689 -----
 drivers/usb/fotg210/fotg210-udc.c  |   97 +-
 drivers/usb/fotg210/fotg210-udc.h  |    2 +-
 drivers/usb/fotg210/fotg210.h      |   26 +-
 drivers/usb/host/ehci-dbg.c        |    3 +-
 drivers/usb/host/ehci-hcd.c        |   31 +-
 drivers/usb/host/ehci-hub.c        |  100 +-
 drivers/usb/host/ehci-timer.c      |    3 +-
 drivers/usb/host/ehci.h            |   47 +-
 12 files changed, 516 insertions(+), 6430 deletions(-)
---
base-commit: cee9395acd8043be0644b25c34bfa86623f2b935
change-id: 20260203-gemini-usb-fotg2-3873e0d9288a

Best regards,
--  
Linus Walleij <linusw@kernel.org>

Hi Linus,

On Wed, 2 Sept 2026 at 15:11, Linus Walleij <linusw@kernel.org> wrote:
>
> Replace the private FOTG210 EHCI fork with the common EHCI core and
> quirks for its shifted or missing registers, integrated transaction
> translator, speed reporting, and reset sequence.

Thanks for doing this! I didn't have the time to do this all in one go
so I sent an RFC patch for allowing overrides in the ehci driver as a
prerequisite a few weeks ago.
I will rebase my version of this on top of this series and test on my
hardware when I get some time.

Cheers,

Daniel

Hi Daniel,

On Thu, Sep 3, 2026 at 1:06 PM Daniel Palmer <daniel@thingy.jp> wrote:

> Thanks for doing this! I didn't have the time to do this all in one go
> so I sent an RFC patch for allowing overrides in the ehci driver as a
> prerequisite a few weeks ago.
> I will rebase my version of this on top of this series and test on my
> hardware when I get some time.

I should have worked on this sooner, the FOTG210 was in
sad shape and you told me exactly what needed to get done.

I have made some modifications in accordance with Alan's
feedback, I will send it out as v3 so you can check.

Yours,
Linus Walleij