This is a note to let you know that I've just added the patch titled usb: dwc3: don't reset device side if dwc3 was configured as host-only to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-dwc3-don-t-reset-device-side-if-dwc3-was-configured-as-host-only.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From e835c0a4e23c38531dcee5ef77e8d1cf462658c7 Mon Sep 17 00:00:00 2001 From: Jisheng Zhang <jszhang@xxxxxxxxxx> Date: Wed, 28 Jun 2023 00:20:18 +0800 Subject: usb: dwc3: don't reset device side if dwc3 was configured as host-only From: Jisheng Zhang <jszhang@xxxxxxxxxx> commit e835c0a4e23c38531dcee5ef77e8d1cf462658c7 upstream. Commit c4a5153e87fd ("usb: dwc3: core: Power-off core/PHYs on system_suspend in host mode") replaces check for HOST only dr_mode with current_dr_role. But during booting, the current_dr_role isn't initialized, thus the device side reset is always issued even if dwc3 was configured as host-only. What's more, on some platforms with host only dwc3, aways issuing device side reset by accessing device register block can cause kernel panic. Fixes: c4a5153e87fd ("usb: dwc3: core: Power-off core/PHYs on system_suspend in host mode") Cc: stable <stable@xxxxxxxxxx> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx> Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20230627162018.739-1-jszhang@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/dwc3/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -275,9 +275,9 @@ int dwc3_core_soft_reset(struct dwc3 *dw /* * We're resetting only the device side because, if we're in host mode, * XHCI driver will reset the host block. If dwc3 was configured for - * host-only mode, then we can return early. + * host-only mode or current role is host, then we can return early. */ - if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) + if (dwc->dr_mode == USB_DR_MODE_HOST || dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) return 0; reg = dwc3_readl(dwc->regs, DWC3_DCTL); Patches currently in stable-queue which might be from jszhang@xxxxxxxxxx are queue-5.15/usb-dwc3-don-t-reset-device-side-if-dwc3-was-configured-as-host-only.patch