The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From f4fd84ae0765a80494b28c43b756a95100351a94 Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Date: Thu, 21 Apr 2022 19:33:56 -0700
Subject: [PATCH] usb: dwc3: core: Only handle soft-reset in DCTL
Make sure not to set run_stop bit or link state change request while
initiating soft-reset. Register read-modify-write operation may
unintentionally start the controller before the initialization completes
with its previous DCTL value, which can cause initialization failure.
Fixes: f59dcab17629 ("usb: dwc3: core: improve reset sequence")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/6aecbd78328f102003d40ccf18ceeebd411d3703.1650594792.git.Thinh.Nguyen@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 1ca9dae57855..d28cd1a6709b 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -274,7 +274,8 @@ int dwc3_core_soft_reset(struct dwc3 *dwc)
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg |= DWC3_DCTL_CSFTRST;
- dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+ reg &= ~DWC3_DCTL_RUN_STOP;
+ dwc3_gadget_dctl_write_safe(dwc, reg);
/*
* For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit
