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[0/8] usb: dwc3: qcom: fix wakeup implementation

Message ID 20220802151404.1797-1-johan+linaro@kernel.org (mailing list archive)
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Series usb: dwc3: qcom: fix wakeup implementation | expand

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Johan Hovold Aug. 2, 2022, 3:13 p.m. UTC 
This series fixes some of the fallout after the recently merged series
that added wakeup support to the Qualcomm dwc3 driver:

	https://lore.kernel.org/all/1655094654-24052-1-git-send-email-quic_kriskura@quicinc.com/

The first patch fixes a long standing PHY power sequencing issue in dwc3
core.

The second patch reverts a power-domain hack that was added by the above
series. There are other ways to implement this which doesn't violate the
genpd interface, and if for some reason those are not sufficient, the
genpd implementation needs to be extended, not hacked around.

The third patch fixes a couple of NULL-pointer dereferences when
suspending controllers in peripheral or OTG mode due to a hack that was
added to suspend path. Unfortunately, it seems the hack needs to stay
for now if we want functioning suspend on some Qualcomm platforms.

The fourth patch fixes another issue in the Qualcomm dwc3 implementation
that has been added a while back and which breaks runtime PM.

The remaining patches moves the wakeup-source property over from the
core node to the glue node in the binding and instead propagates the
wakeup capability to the former during probe.

Note that this incidentally also avoids adding probe-deferral hacks to
the driver as was recently proposed to deal with another problem with
the current implementation:

	https://lore.kernel.org/all/1657891312-21748-1-git-send-email-quic_kriskura@quicinc.com/

With this series I have functioning USB system suspend and wakeup as
well as somewhat functioning runtime PM in host mode on sc8280xp. Note
that the PHYs apparently do not need to be shutdown for wakeup on this
platform.

Some issues remain such as that the controller needs to be suspended to
handle remote wakeup during runtime PM (the wakeup interrupts probably
needs to be enabled whenever there's a wakeup-capable device connected
to the bus) and that root hub connect/disconnect events cannot
selectively be disabled.

And of course, the suspend speed hack needs to be replaced at some
point but that likely requires some more heavy lifting in the dwc3
implementation.

Johan


Johan Hovold (8):
  usb: dwc3: fix PHY disable sequence
  Revert "usb: dwc3: qcom: Keep power domain on to retain controller
    status"
  usb: dwc3: qcom: fix broken non-host-mode suspend
  usb: dwc3: qcom: fix runtime PM wakeup
  Revert "dt-bindings: usb: dwc3: Add wakeup-source property support"
  dt-bindings: usb: qcom,dwc3: add wakeup-source property
  usb: dwc3: qcom: fix wakeup implementation
  usb: dwc3: qcom: clean up suspend callbacks

 .../devicetree/bindings/usb/qcom,dwc3.yaml    |  2 +
 .../devicetree/bindings/usb/snps,dwc3.yaml    |  5 --
 drivers/usb/dwc3/core.c                       | 24 +++---
 drivers/usb/dwc3/dwc3-qcom.c                  | 77 ++++++++++---------
 4 files changed, 55 insertions(+), 53 deletions(-)