[PATCH v4 0/9] usb: cdns: fix suspend on J7200 by assuming reset-on-resume

[Théo Lebrun]

Hi,

Here is a new revision of the J7200 USB suspend fix. It is currently
broken on the platform, leading to a kernel panic at resume. Patches
are tested on a J7200 evaluation board, both s2idle and suspend-to-RAM.

This revision only changes dt-bindings and DTS stuff. We fix the current
situation (as discussed previously [0]) and add our J7200 compatible.

Have a nice day,
Théo

[0]: https://lore.kernel.org/lkml/20240223-j7200-usb-suspend-v3-1-b41c9893a130@xxxxxxxxxxx/

--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Signed-off-by: Théo Lebrun <theo.lebrun@xxxxxxxxxxx>
---
Changes in v4:
- dt-bindings: usb: ti,j721e-usb:
  - Remove ti,am64-usb single compatible entry.
  - Reverse ordering of compatible pair j721e + am64
    (becoming am64 + j721e).
  - Add j7200 + j721e compatible pair (versus only j7200). It is the
    same thing as am64: only the integration differs with base j721e
    compatible.
  - NOT taking trailers from Conor as patches changed substantially.
- arm64: dts: ti: j3-j7200:
  - Use j7200 + j721e compatible pair (versus only j7200 previously).
- arm64: dts: ti: j3-am64:
  - Fix to use am64 + j721e compatible pair (versus only am64).
    This is a new patch.
- Link to v3: https://lore.kernel.org/r/20240223-j7200-usb-suspend-v3-0-b41c9893a130@xxxxxxxxxxx

Changes in v3:
- dt-bindings: use an enum to list compatibles instead of the previous
  odd construct. This is done in a separate patch from the one adding
  J7200 compatible.
- dt-bindings: dropped Acked-by Conor as the changes were modified a lot.
- Add runtime PM back. Put the init sequence in ->runtime_resume(). It
  gets called at probe for all compatibles and at resume for J7200.
- Introduce a cdns_ti_match_data struct rather than rely on compatible
  from code.
- Reorder code changes. Add infrastructure based on match data THEN add
  compatible and its match data.
- DTSI: use only J7200 compatible rather than both J7200 then J721E.
- Link to v2: https://lore.kernel.org/r/20231120-j7200-usb-suspend-v2-0-038c7e4a3df4@xxxxxxxxxxx

Changes in v2:
- Remove runtime PM from cdns3-ti; it brings nothing. That means our
  cdns3-ti suspend/resume patch is simpler; there is no need to handle
  runtime PM at suspend/resume.
- Do not add cdns3 host role suspend/resume callbacks; they are not
  needed as core detects reset on resume & calls cdns_drd_host_on when
  needed.
- cdns3-ti: Move usb2_refclk_rate_code assignment closer to the value
  computation.
- cdns3/host.c: do not pass XHCI_SUSPEND_RESUME_CLKS quirk to xHCI; it
  is unneeded on our platform.
- Link to v1: https://lore.kernel.org/r/20231113-j7200-usb-suspend-v1-0-ad1ee714835c@xxxxxxxxxxx

---
Théo Lebrun (9):
      dt-bindings: usb: ti,j721e-usb: fix compatible list
      dt-bindings: usb: ti,j721e-usb: add ti,j7200-usb compatible
      usb: cdns3-ti: move reg writes from probe into ->runtime_resume()
      usb: cdns3-ti: support reset-on-resume behavior
      usb: cdns3-ti: pass auxdata from match data to of_platform_populate()
      usb: cdns3: add quirk to platform data for reset-on-resume
      usb: cdns3-ti: add J7200 support with reset-on-resume behavior
      arm64: dts: ti: k3-j7200: use J7200-specific USB compatible
      arm64: dts: ti: k3-am64: add USB fallback compatible to J721E

 .../devicetree/bindings/usb/ti,j721e-usb.yaml      |   6 +-
 arch/arm64/boot/dts/ti/k3-am64-main.dtsi           |   2 +-
 arch/arm64/boot/dts/ti/k3-j7200-main.dtsi          |   2 +-
 drivers/usb/cdns3/cdns3-ti.c                       | 125 ++++++++++++++++-----
 drivers/usb/cdns3/core.h                           |   1 +
 drivers/usb/cdns3/host.c                           |   3 +
 6 files changed, 105 insertions(+), 34 deletions(-)
---
base-commit: 1871c27e3539e5b812d50ec6ccad7567ec5414f2
change-id: 20231113-j7200-usb-suspend-2a47f2281e04

Best regards,
-- 
Théo Lebrun <theo.lebrun@xxxxxxxxxxx>