On Thu, Nov 03, 2022, Johan Hovold wrote:
This reverts commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea.
The offending commit disabled the USB core PHY management as the dwc3 already manages the PHYs in question.
Unfortunately some platforms have started relying on having USB core also controlling the PHY and this is specifically currently needed on some Exynos platforms for PHY calibration or connected device may fail to enumerate.
The PHY calibration was previously handled in the dwc3 driver, but to work around some issues related to how the dwc3 driver interacts with xhci (e.g. using multiple drivers) this was moved to USB core by commits 34c7ed72f4f0 ("usb: core: phy: add support for PHY calibration") and a0a465569b45 ("usb: dwc3: remove generic PHY calibrate() calls").
The same PHY obviously should not be controlled from two different places, which for example do no agree on the PHY mode or power state during suspend, but as the offending patch was backported to stable, let's revert it for now.
Reported-by: Stefan Agner stefan@agner.ch Link: https://urldefense.com/v3/__https://lore.kernel.org/lkml/808bdba846bb60456ad... Fixes: 6000b8d900cd ("usb: dwc3: disable USB core PHY management") Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold johan+linaro@kernel.org
drivers/usb/dwc3/host.c | 10 ---------- 1 file changed, 10 deletions(-)
Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com
Thanks, Thinh