linux-kernel - [PATCH v2] usb: dwc3: core: fix a issue about clear connect state

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Message-Id: <20201019023435.5482-1-zhengdejin5@gmail.com>
Date:   Mon, 19 Oct 2020 10:34:35 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     balbi@...nel.org, gregkh@...uxfoundation.org,
        sergei.shtylyov@...il.com, linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH v2] usb: dwc3: core: fix a issue about clear connect state

According to Synopsys Programming Guide chapter 2.2 Register Resets,
it cannot reset the DCTL register by setting DCTL.CSFTRST for core soft
reset, if DWC3 controller as a slave device and stay connected with a usb
host, then, while rebooting linux, it will fail to reinitialize dwc3 as a
slave device when the DWC3 controller did not power off. because the
connection status is incorrect, so we also need to clear DCTL.RUN_STOP
bit for disabling connect when doing core soft reset.

Fixes: f59dcab176293b6 ("usb: dwc3: core: improve reset sequence")
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
v1 -> v2:
	* modify some commit messages by Sergei's suggest, Thanks
	  very much for Sergei's help!

 drivers/usb/dwc3/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 2eb34c8b4065..239636c454c2 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -256,6 +256,7 @@ static int dwc3_core_soft_reset(struct dwc3 *dwc)

 	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 	reg |= DWC3_DCTL_CSFTRST;
+	reg &= ~DWC3_DCTL_RUN_STOP;
 	dwc3_writel(dwc->regs, DWC3_DCTL, reg);

 	/*
-- 
2.25.0