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 4.19-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-4.19 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
@@ -242,9 +242,9 @@ static int dwc3_core_soft_reset(struct d
/*
* 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-4.19/usb-dwc3-don-t-reset-device-side-if-dwc3-was-configured-as-host-only.patch
